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In order to reveal the influence of stress paths on the stress-strain characteristics of natural sedimentary soft soil, physical and mechanical properties, conventional triaxial and stress path tests were carried out on the undisturbed soft soils of Tianjin and Hengshui Lake. The systematical investigation was conducted on the stress-strain characteristics and influencing factors of natural sedimentary soft soil under different stress paths. The main conclusions are as follows: stress-strain characteristics of soft soil are changed by the variation of the structural and bonding characteristics. Under the drainage shear, Tianjin soft soil with weaker structural and bonding characteristics reveals the strain hardening characteristics similar to remolded soil, while Hengshui Lake soft soil with stronger structural and bonding characteristics exhibits the strain softening characteristics of undisturbed soil. Due to the presence of structural and bonding characteristics, natural sedimentary soft soil can hear tensile stress and show expansion deformation. The content of clay particles and colloidal particles of Hengshui Lake soft soil are higher than Tianjin soft soil, exhibiting obvious bonding characteristics, higher shear strength and more significant expansion deformation under the axial unloading stress paths. The conclusions can provide reference for the design calculation and constitutive model of natural sedimentary soft soil. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of High Pressure Physics is the property of Chinese Journal of High Pressure Physics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The mechanical properties of soil rock mixture are important parameters affecting the design and construction ofembankment. Therefore, the related research has always been a hot topic. To analyze the mechanical properties of soil rockmixture under different moisture content, soil rock mixing ratio, compaction work and soil material thickness conditions,compaction tests and large -scale direct shear tests were conducted on soil rock mixture under different combinations. Theinfluence of the above factors on the optimal water content and mechanical index of the mixture was revealed, andacalculationmethod for the mechanical indicators of soil rock mixture was established. The research shows that the total compaction work,moisture content, and stone content have a significant impact on the dry density of the sample. As the stone content increases,the maximum dry density of the soil rock mixture gradually increases but the optimal moisture content gradually decreases. Thedry density increases with the increase of compaction times per layer. As the normal stress increases, the stress-strain curve ofsoil rock mixture gradually changes from strain hardening type to strain softening type. As the stone content increases, theinternal friction angle decreases but the cohesion increases slightly. The results can provide theoretical reference for theconstruction and design of the embankment with soil rock mixture. [ABSTRACT FROM AUTHOR]

In order to further explore the influence of freezing and thawing on the deformation and strength of loess under the actual working conditions, this paper carries out the compression test of loess after experiencing 0,1, and 4 pressurized freeze-thaw cycles, respectively. The results show that： after experiencing pressurized freeze-thaw, the frozen loess mostly shows brittle damage mode, and the stress-strain curve is strain-hardening curve. The strength of loess decreases by about 35% after one pressurized freezethaw cycle, and the strength decreases by 51% after four pressurized freeze-thaw cycles, which is a nonlinear negative correlation. In the case of the same number of freeze-thaw cycles, with the increase of the water content, the peak stress will be reduced gradually and the strength in the range of water content decreases by nearly 77%. The uniaxial compressive strength of frozen loess shows a significant increase with the increase of initial dry density and the decrease of test temperature, when the temperature decreases from -10℃ to -15℃, the strength increases 1. 5 times, and the strength increases 2 times when the temperature decreases from -15℃ to -20℃. Finally, based on the Gaussian function, a strength model of frozen loess is constructed considering the influence of pressurized freeze-thaw cycles, which can better reflect the strain hardening situation of frozen loess. [ABSTRACT FROM AUTHOR]

Copyright of Foundry Technology (1000-8365) is the property of Foundry Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Beijing University of Civil Engineering & Architecture is the property of Journal of Beijing University of Civil Engineering & Architecture Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Foundry Technology (1000-8365) is the property of Foundry Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of High Pressure Physics is the property of Chinese Journal of High Pressure Physics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective] To deepen the connection between theory and practice in the teaching of direct shear experiments in soil mechanics, a temperature-controlled static and dynamic direct shear experimental system was designed in this study. [Methods] The designed experimental system was based on the principle of direct shear. Normal stress and horizontal shear displacement were applied through an air cylinder and a servo motor, respectively. The condition of constant normal stiffness was achieved by installing a normal spring. The sample temperature was controlled through the flow of liquid at constant temperatures. The data was collected through a data acquisition system. The experimental process was also controlled through this system. Combined with practical issues in the application of energy geostructures, wherein the surrounding soil and soil-structure interface was subjected to thermal, static, and dynamic loads. Non-isothermal shear tests were conducted using this new system. To verify the reliability of the designed experimental system, monotonic direct shear tests were conducted on sand under constant normal stress and monotonic direct shear tests on sand-steel interfaces under constant normal stiffness conditions. To study the influence of the temperature on the static and dynamic shear characteristics of the soil and soil-structure interfaces, monotonic and cyclic shear tests on the sand, monotonic shear tests at the clay-steel interface under constant normal stress conditions, and monotonic shear tests at the sand-steel interface under constant normal stiffness conditions were performed at 22 °C and 60 °C, respectively. [Results] The results showed that the correlations between the shear strengths and the corresponding normal stresses for the tested sand and sand-steel interface under different boundary conditions could be fitted with straight lines, called the Coulomb strength lines. The results also showed that the monotonic shear stress curves at 22 C and 60 C almost overlapped for both sand and sand-steel interface samples. Irreversible displacements were observed during the cyclic shear process of sand samples at 22 C and 60 C, and no significant discrepancy was observed between the shear stress-shear displacement curves with continual shear. However, the monotonic shear at the interface between the clay and the steel exhibited strain hardening characteristics, and the interface shear strength slightly increased with temperature. [Conclusions] The experimental results verified the applicability and accuracy of the designed temperature-controlled static and dynamic direct shear experimental system. This experimental system can research thermal coupling characteristics of soils and soil-structure interfaces, evaluate the bearing characteristics of energy geostructures, enrich the direct shear experimental teaching content, cultivate awareness regarding experiments serving engineering problems, and improve their ability to solve practical problems. Based on the preliminary experimental results, temperature showed no significant effect on the shear mechanical properties of the sand and sand-steel interface but significantly affected the shear properties of the clay-steel interface. In the design and application of energy geostructures, the effect of temperatures should be considered reasonably based on the characteristics of the onsite soil and soil-structure interfaces. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The microstructure, damprng behavior and mechanical properties of direciionally solidiiied MnCu-based alloys with different chemical compoiiioon gradients were studied via uimg dynamic thermomechanical analyzer, Opiical Microscope, X-Ray Diffractometer and Scanning Electron Microscope. The results show that duiing direciional solidieicaeion,the dendiite spaing gradually decreaseslthe degree of component segregaiion increases,and the phase consiituent becomes a ingle parent phase with the addieion of alloying llemente. The compoeieion supercooing caused by entropy increase makes the dendiites prone to fracture. The addiiion of nickll and iron Increases the internal fiiciion value of the low-temperature twin, after adding Zn,the Internal fiiciion value of the MnCuNiFeZn alloy at 673 K iises to 0. 023. With the increase of mixed entropy,the teniile strength and elongaiion of the three alloys increase lineaely,and the llope of the stable holing seciion of the alloy strain hardening rate is poeieively comlated with the entropy of mixing. [ABSTRACT FROM AUTHOR]

Copyright of Polymer Materials Science & Engineering is the property of Sichuan University, Polymer Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

SiCp/2024Al composite material was prepared by ultrasonic assisted semi-solid stirring casting process, and then the twostep hot deformation (extrusion and rolling) was carried out to obtain SiCp/2024Al composite sheet with a thickness of 1 mm, the influence of SiCp content on its microstructure and mechanical properties was investigated. The results show that the rolled 2024 aluminum alloy consists of banded grains and bulk CuAl2 phase. Due to the promotion effect of SiCp on the dynamic recrystallization nucleus of the Al matrix, the grain size of the 2024 aluminum matrix was significantly refined. With the increase of the volume fraction of SiCp, its macroscopic distribution becomes more uniform. The two-step deformation results in the fracture of SiCp and CuAl2 phases, the fracture degree increases with the increase of the volume fraction of SiCp. When the SiCp volume fraction is 15%, the SiCp size is reduced to about 4.9 m. With the increase of the SiCp volume fraction, the yield strength gradually increases. When SiCp volume fraction is 10%, the comprehensive mechanical properties of SiCp/2024Al composite plate are the best, and its yield strength, ultimate tensile strength and elongation can reach 305, 490 MPa and 8% respectively. With the increase of SiCp volume fraction, the thermal expansion coefficient of SiCp/2024Al composite decreases and the elastic modulus increases, when the SiCp volume fraction is 15%, the elastic modulus can reach 96 GPa, which is 37.1% higher than the 2024 aluminum alloy. [ABSTRACT FROM AUTHOR]

SiC/AZ31 inverse nacre structured composite was prepared by mechanical ball milling and thermal deformation, and the microstructure of the composite was effectively controlled by process control. The microstructure was characterized by X-ray diffraction XRD and scanning electron microscopy (SEM), the mechanical properties of the material were tested by quasi-static tensile test, and the strengthening and toughening mechanism and failure mechanism were preliminarily analyzed by combining the microstructure. The results show that the inverse nacre structure obtained by hot deformation process can significantly improve the tensile properties. When the strain hardening ability of the matrix in the inverse nacre structured composite is improved, it can better compensate for the softening effect caused by crack propagation in the hard phase, and the strain hardening ability of the composite is improved. The tensile properties can be controlled by adjusting the size of the lamellar soft phase in the inverse nacre structured composite. When the size of lamellar soft phase is large, the composite has better toughness. When the size of lamellar soft phase is small, the composite has higher strength. The excellent strength and toughness of the inverse nacre structure composite are arising from its structural characteristics, and the continuous hard phase plays a good role in bearing, while the dispersed lamellar soft phase benefits for improving the toughness of the composite. The main strengthening mechanisms of this material include dispersion strengthening, fine grain strengthening, and heterogeneous deformation induced strengthening, and the improvement of toughness are attributed to the crack blunting and deflection induced by lamellar soft phase. In summary, the architecture design of inverse nacre structure is an effective way to obtain high-strength and tough magnesium matrix composite. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Railway Science & Engineering is the property of Journal of Railway Science & Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Polypropylene (PP), a general-purpose thermoplastic resin, is widely used in vehicles, medical and construction applications because of its light weight, ease of processing and molding, and good chemical stability. The effects of molecular weight and molecular weight distribution, branching structure and processing technology on the rheological behavior of PP are reviewed. The results show that PP with higher molecular weight and wider molecular weight distribution has higher viscosity at low frequency, and the shear thinning is the most obvious. The introduction of branched chain structure helps to improve the melt strength of PP, and increases its viscous flow activation energy, and the degree of strain hardening also increases with the increase of branched chain content. With the increase of shear rate, the apparent shear viscosity of PP melt decreases, showing a typical 'shear thinning' behavior of pseudoplastic fluid. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To study the surface integrity of the stainless steel closed integral bling in abrasive flow machining, single factor tests of processing time, processing pressure and abrasive mesh size are carried out on the stainless steel samples prepared by electrical discharge machining, and the influence of three factors on the surface integrity after machining is investigated. The surface roughness value Ra decreases with the increase of processing time, from 1.459 μm at the initial time to 0.193 μm at 60 min. The surface roughness decreases at a slower and slower rate, and finally tends to stabilize. The recast layer is effectively removed by abrasive flow machining, and the microhardness decreases from 450~950 HV to 270~350 HV after machining, and the distribution uniformity is improved. The microhardness decreases with the increase of processing time, and some work hardening occurs. The residual stress changes from tensile stress to compressive stress after abrasive flow machining with different mesh numbers of abrasives. With the increase of processing time and pressure, the smoother the sample surface is, the better the polishing effect will be. [ABSTRACT FROM AUTHOR]

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Industrial Minerals & Processing / Huagong Kuangwu yu Jiagong is the property of Industrial Minerals & Processing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Rural Water & Hydropower is the property of China Rural Water & Hydropower Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Cold rolling and heat treatment experiments of GH4169 alloy with different deformation were carried out. Effect of different cold rolling deformation and heat treatment state on microstructure and hardness of plate was analyzed. Cold rolling experimental results show that dislocation density is increased, dislocations are cross slipped, deformation texture are enhanced, twins boundaries are decreased and hardness is improved with the increasing of deformation. Different heat treatment experimental results show that when the cold rolling deformation within 0%-20%, after 980 ° C x 10 min solution treatment, the recrystallization is incepted, grains are refined, deformed grains and dislocation are remained in the plate. When the deformation within 0%-20%, deformed grains are remained and recrystallized grain size is refined with the increasing of deformation, thus the hardness of solution treated plate is increased with the increasing of deformation. The recrystallization finished and work hardening is eliminated,thus the hardness of solution treated plate decline to undeformed level and remains unchanged when the deformation larger than 25%. The γ' and γ'' phases are precipitated in the plate after aging heat treatment, and the hardness of the plate is significantly higher than that of the cold rolled and solid solution treatment states, and the hardness is basically not affected by the deformation amount of cold rolling. The threshold value of cold rolling deformation for recrystallization inception of GH4169 alloy is within 5%-10% during 980 ° C solution treatment. And the cold rolling deformation threshold value of complete recrystallization is about 25%. According to actual production condition, the optimal cold rolling deformation is larger than 25%, and the matched solution treatment is 980 ° C x 10 min. [ABSTRACT FROM AUTHOR]

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Both deformation temperature and strain rate affect the mechanical properties of β titanium alloy, and are related to the change of deformation mode in the process of plastic deformation. The effects of deformation temperature and strain rate coupling on the mechanical properties of {332}〈113〉 twinning induced plastic effect Ti-15Mo alloy were studied by TEM, EBSD, SEM, XRD, OM and tensile testing machine.The results show that as increase of strain rate, yield strength increases at 298 K and 573 K, which is intensively dependent on dislocation thermal activation behavior. The larger contribution of dislocation activation at 573 K exhibites the higher strain rate dependency on yield strength. At 573 K, the Ti-15Mo alloy is deformed by {332}〈113〉 twinning and dislocation slip, which is different from that at 298 K, and the established flow stress model indicates that dislocation strengthening has a greater contribution. At a high strain rate, the formation of more twins at early deformation suppresses the subsequent formation of twins, decreasing the work hardening rate, whereas can effectively decrease the local stress concentration due to the inhomogeneous distribution of dislocations, delaying the necking. Consequently, these two factors result in the lower strain rate dependency on flow stress in the Ti-15Mo alloy under the coupling effect of deformation temperature and strain rate.

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China University of Technology (Natural Science Edition) is the property of South China University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Railway Science & Engineering is the property of Journal of Railway Science & Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The longitudinal-torsion compound ultrasonic vibration dry milling characteristics were experimentally studied for AlMgSc alloys formed by arc micro-casting and forging additive manufacturing. The influence rules of ultrasonic milling parameters, such as cutting force, surface morphology, work hardening and tool wear, were discussed about the dry milling forming characteristics of AlMgSc alloys. Results show that the arc micro-casting and forging additive manufactured AlMgSc alloys which have more dense microstructure, higher strength and hardness comparing with conventional forging and common arc added material forming aluminum alloys, may produce larger milling frces in ultrasonic dry milling processes and be more likely to occur work hardening phenomenon. And the longitudinal-torsion compound ultrasonic vibration dry milling may get lower surface roughness and is helpful to reduce the tool wear comparing with conventional dry milling. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper, the three failure modes of pipes were summarized and the molecular mechanism and fracture mechanics mechanism of slow crack growth were briefly described. The principle and test process of the strain hardening modulus (SH) method were introduced in detail. The paper also reviewed the research progress in the correlation of material microstructures, the domestic and foreign reliability research of SH method for the evaluation of the slow crack growth resistance of pipes, and the application of SH method for the evaluation of the environmental stress cracking resistance of materials. Finally, the applications of SH method for the control of outlook on product quality was discussed. [ABSTRACT FROM AUTHOR]

Through the tensile test of 6082-T6 aluminum profile, the mechanical properties parameters of the material (elastic modulus E, specified non-proportional tensile strength, proportional limit, tensile strength, elongation at break, Poisson's ratio and strain hardening coefficient N) were measured and counted. The mechanical properties and stress-strain curve of 6082-T6 aluminum alloy were analyzed, and the simulated tensile test was established by Abaqus. Through statistical analysis of experimental data, the statistical values of material mechanical properties parameters (elastic modulus, Poisson's ratio, specified non-proportional elongation strength) are close to those specified in China's "Code for Design of Aluminum Alloy Structures". The ratio of strain hardening index calculated by two-point method to specified non-proportional extension strength is less than the recommended value. The constitutive model obtained by the two-point method can predict the real stress-strain and simulated stress-strain well. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Effect of intercritical annealing temperature on multiphase microstructure evolution and mechanical properties of 0.02C-7Mn steel during tensile deformation was investigated. Results indicated that both tensile strength and yield strength decreased firstly and then increased with the increasing annealing temperature, while the total elongation had an opposite trend. After annealed at 600 °C, the microstructure contained retained austenite and annealing martensite. When annealed between 620 °C and 700 °C, the microstructure consisted of retained austenite, α'-martensite and ε-martensite. With the further increase of annealing temperature, the γ → α', γ → εand ε → a' transformations appeared successively. The γ→ε transformation had the most significant effect on the total elongation, while the ε→α' transformation was beneficial for working hardening properties. After annealed at 620 °C, the existence of γ →a', and γ→ε transformations led to excellent mechanical properties: tensile strength was 776.5 MPa, yield strength was 675.0 MPa and total elongation was 29.5%. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Wear resistance of plow tips has been one of the most important issues in a high-speed hydraulic reversible plough. In this study, the Carburizing-Quenching-Tempering (CQT) process was employed to improve the wear resistance of plow tips fabricated by the 33MnCrB5 steel with the hard alloy coatings. A systematic investigation was also made to elucidate the influence mechanism of the process on the microstructure and wear resistance of carburized plow tips. The results show that the maximum content of near-surface carbon and the depth of the carburized layer were 0.70 % and 2.5 mm, respectively, for the 33MnCrB5 plow tips after CQT process. The surface carbon content of the plow tip was significantly higher than that treated by Quenching-Tempering (QT) process. In addition, the surface microstructure of the CQT plow tip was composed of plate martensite (high hardness), retained austenite, and a small amount of carbide. Specifically, the core microstructure was mainly lath martensite (high strength and toughness), which was different from the microstructure of lath martensite and pro-eutectoid ferrite in the QT plow tip. The microhardness and tensile strength of CQT 33MnCrB5 plow tips were greatly enhanced, due to the evolution of the microstructure. The yield strength and tensile strength of the carburized plow tip in the core region reached up to 1584 and 1898 MPa, respectively, while, the surface microhardness reached 699 HV1. Among them, the yield strength, tensile strength, and surface microhardness increased by 198 and 314 MPa, and 252 HV1, respectively, compared with the QT plow tip. The friction tests show that the CQT plow tip (0.29) presented a lower friction coefficient, but a higher abrasive resistance, compared with the QT plow tip (0.37). The improvement was attributed to the fact that the carburized layer was produced into the abrasive chips with the higher hardness carbides during wear, thus increasing the contact area between the carburized layer and the friction substrate. Furthermore, the field tests indicated that the total wear of the CQT plow tip after 120 hm² of operation (91 g) was significantly lower than that of the QT plow tip (144 g), in terms of the profile dimensions in the length, width and thickness directions. Nevertheless, the carbide layer on both CQT and QT plow tips was completely fractured, indicating that the overlaying carbide layer failed to protect the tips for a long time. The combined strengthening was achieved to integrate the high hardness plate martensite and strain-induced martensitic transformation in the carburized layer. The high hardness of plate martensite and diffusely distributed carbide organization in the carburized layer effectively hindered the abrasive particles from pressing into the substrate, and then weakened the cutting of abrasive particles on the plow tip material, particularly for the higher local resistance of the material to destructive deformation. At the same time, the residual austenite in the near-surface layer of the carburized layer produced significant strengthening, due to the dislocation strengthening and strain-induced martensitic phase transformation during the frictional wear of the plow tip. The strengthening layer was used to transfer the external load into a greater depth, thus triggering the dislocation movement at stresses above the yield point. As a result, the strain-induced martensite appeared within the slip band. As such, the internal microhardness gradient of the sample inward development resulted in significant work hardening, especially for the higher wear resistance of the CQT plow tip. Moreover, the surface area of the CQT plow tip after wear was significantly larger than that of the QT one. Correspondingly, there was a decrease in the load and friction heat release per unit area of the CQT plow tip, in order to reduce the creep softening tendency of the material to be worn. The higher wear resistance of the CQT plow tip was finally achieved in this case. The finding can shed light on the wear resistance of key soil-engaging components in the agricultural machinery and manufacturing industry. [ABSTRACT FROM AUTHOR]