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36. Research progress of dynamic phase transformation behavior of titanium alloy under thermo-mechanical coupling process

Author

FAN Jiangkun, LAI Minjie, TANG Bin, KOU Hongchao, and LI Jinshan

Subjects
titanium alloy, thermo-mechanical coupling, deformation, phase transformation, variant selection, Motor vehicles. Aeronautics. Astronautics, TL1-4050
Abstract

Deformation and phase transformation are two major topics in the study of titanium alloy materials. Titanium alloys usually require a series of complex thermo-mechanical treatments to obtain a microstructure corresponding to service performance. Its hot deformation behavior is a typical thermo-mechanical coupling process. Deformation and phase transformation may occur simultaneously and affect each other. It is one of the current research hotspots. However, due to the inevitable existence of dynamic recovery / recrystallization, microstructure fragmentation / spheroidization, a large number of deformation defects, deformation texture, and stress-induced phase transformation during hot deformation, coupled with the changes of the phase transformation kinetics characteristics and the crystallographic mechanism of the variant selection under thermo-mechanical coupling, directly leads to the extremely complicated dynamic phase transformation behavior of the titanium alloy during the hot deformation process, and it becomes quite difficult to reveal its evolution law in depth. This paper summarizes the main characteristics and laws of titanium alloy deformation and phase transformation in view of the dynamic phase transformation behavior of titanium alloy during hot deformation,mainly introduces the research progress of the dynamic phase transformation of the titanium alloy under the thermo-mechanical coupling from the three aspects of precipitation phase morphology characteristics, variant selection mechanism and phase transformation kinetics characteristics, and summarizes and prospects its research and development trend.

Published
2020
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44. Research on the Recrystallization Process of the Ti-70 Titanium Alloy Sheet.

Author

Zhang, Zhixin, Tang, Bin, Li, Ruifeng, Fan, Jiangkun, and Li, Jinshan

Subjects
RECRYSTALLIZATION (Metallurgy), TITANIUM alloys, TENSILE strength, HEAT treatment, HARDNESS testing, ACTIVATION energy
Abstract

As Ti-70 is a new type of marine titanium alloy, research on the recrystallization process of its sheet is necessary. This article studies the effects of different temperatures and times of annealing on the recrystallization process of 5.0 mm thick Ti-70 titanium alloy cold-rolled sheets by metallographic analyses and hardness tests. The results show that after 30 min of annealing at 620~700 °C, the recrystallization process was mostly complete, and uniform and equiaxed recrystallized grains could be obtained. The recrystallization process starts after 8 min of annealing at 700 °C, and after holding for 15~30 min, the recrystallization process is almost complete and the grain size is about 8.2 μm. The recrystallization activation energy of a Ti-70 titanium alloy cold-rolled sheet is Qr = 11.0645 × 104 J/mol. The ultimate tensile strength (Rm) can be controlled between 705 and 852 MPa, the yield strength (Rp0.2) can be controlled between approximately 623 and 793 MPa, and the elongation percentage (A) can be controlled between approximately 10.0 and 25.0% after rolling and heat treatment of Ti-70 alloy sheets. [ABSTRACT FROM AUTHOR]

Published
2023
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50. On the nature of a peculiar initial yield behavior in metastable β titanium alloy Ti-5Al-5Mo-5V-3Cr-0.5Fe with different initial microstructures

Author

Tang Bin, Zhang Zhixin, Kou Hongchao, Li Jinshan, Fan Jiangkun, Yang Ruimeng, Li Huan, Esling Claude, Gao Puyi, and Zhang Yudong

Subjects
Materials science, Polymers and Plastics, Mechanical Engineering, Lüders band, Metals and Alloys, Titanium alloy, 02 engineering and technology, Slip (materials science), Flow stress, 010402 general chemistry, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, 0104 chemical sciences, Adiabatic shear band, Condensed Matter::Materials Science, Deformation mechanism, Mechanics of Materials, Materials Chemistry, Ceramics and Composites, Composite material, Deformation (engineering), 0210 nano-technology
Abstract

The compressive yielding phenomenon of titanium alloys is not as focused and sufficiently ascertain as the tensile yielding phenomenon. In the present work, the peculiar compressive yielding behavior and the different dynamic responses of three different initial microstructures (single β, clavate α and lamellar α) were investigated in an attractive metastable β titanium alloy Ti-5553 using electron microscopes/crystallographic calculation/crystal plastic finite element simulation. Results reveal that the distinct compressive yielding behavior, steep peaks of sudden drop in the initial stage (very small true strain ˜0.03) of stress loading have appeared in the compression stress-strain curves except for the lamellar α initial microstructure. Dislocation slip is the essential mechanism of the initial yielding behavior. Interlaced multiple-slip bands formed in the single β initial microstructure during the warm deformation process. A small quantity of single slip bands was observed in the deformed clavate α initial microstructure. The abundant varied nano/ultrafine αs precipitates were nucleated dynamically and dispersedly in all the three deformed initial microstructures. The multiple-slip bands formation and substantial nanoscale αs result in the highest peak of flow stress for single β initial microstructure. The compressive slip bands are formed early in the elastic – plastic deformation stage. As the increasing strain, the sample showed a significant compressive bulge, or eventually forming a strong adiabatic shear band or crack. These results are expected to provide a reference for the study of deformation behavior and mechanical properties of metastable β titanium alloys.

Published
2020

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