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Your search keyword '"Molybdenum steel"' showing total 6 results
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6 results on '"Molybdenum steel"'

1. Effect of Lanthanum on mechanical and wear properties of high-pressure die-cast Mg-3Al-3Sn-3Sb alloy

Author

Hüseyin Şevik, Levent Cenk Kumruoğlu, Selma Özarslan, Güven Yarkadaş, Mühendislik ve Doğa Bilimleri Fakültesi -- Metalurji ve Malzeme Mühendisliği Bölümü, and Kumruoğlu, Levent Cenk

Subjects
business.product_category, Dry sliding wear, Mechanical properties, 02 engineering and technology, Die casting, Grain Refinement, 0203 mechanical engineering, Lanthanum, General Materials Science, Elevated temperature, Rare-earth element (La), Magnesium Alloys, Wear testing, 021001 nanoscience & nanotechnology, Wear of materials, 020303 mechanical engineering & transports, Mechanics of Materials, High pressure, Die (manufacturing), Precipitation Hardening, 0210 nano-technology, Tin alloys, Materials science, High pressure die casts, High pressure effects, Materials Science, Alloy, chemistry.chemical_element, engineering.material, Aluminum coated steel, Wear properties, Intermetallic phasis, Lanthanum alloys, Characterization & Testing, Magnesium alloy, Antimony alloys, Molybdenum steel, Mechanical Engineering, Metallurgy, Binary alloys, Aluminum alloys, chemistry, Alloying elements, engineering, Test condition, Micro-structural, business, Sliding velocities
Abstract

In the present study, the effect of an La alloying element with different quantities (1, 3 and 5 wt.-%) on the microstructure, mechanical and dry sliding wear properties of Mg- 3Al-3Sn-3Sb alloy was investigated. The wear tests were done on the alloys using pin on-disk equipment against a 4140 steel disc as counterpart under three different sliding velocities of 0.3, 0.6 and 1.2 ms-1 and four different loads of 5, 10, 20 and 40 N. The microstructural results showed that the new intermetallic phases (La5Sn3 and LaSnSb2) were formed with addition of La to the main alloy. Also, it was observed that the hardness of the Mg-3Al-3Sn-3Sb alloy was raised with increasing La addition. Furthermore, the tensile properties of the Mg-3Al-3Sn-3Sb alloy improved with rising La content at room and elevated temperature. The wear rates of the alloys increase with increasing of the sliding speed and load. In addition to this, the wear rate of the Mg-3Al-3Sn-3Sb alloy was found to be higher than that of the La content alloys for all test conditions.

Published
2021
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2. Industrial scale extrusion performance of cryogenically processed DIN 100 Cr6 and DIN 21NiCrMo2 steels

Author

Karaca, Bahadır, Kumruoğlu, Levent Cenk, Mühendislik ve Doğa Bilimleri Fakültesi -- Metalurji ve Malzeme Mühendisliği Bölümü, and Kumruoğlu, Levent Cenk

Subjects
Nickel steel, Engineering & Materials Science - Manufacturing - Tool Wear, Ternary alloys, Vanadium steel, Cryogenics, Retained austenite, Performance, Manganese alloys, Tool steel, Manganese steel, Impact strength, Industrial scale, Austenite, Heat treatment, Atmospheric temperature, Molds, Stainless steel, Wear, Hardness, Cryogenic treatment, Residual austenite, Microstructure, Holding time, Wear behavior, Chromium steel, Molybdenum steel, Subzero, Hot working, Chromium alloys, High Speed Steel, H2 atmosphere, Aluminum alloys, Dies, Wear of materials, Steel, Hot-work tool steel, Sub zero treatment, Metallurgy & Metallurgical Engineering, Carburization process, Treatment parameters, Extrusion die
Abstract

The effects of diferent heat and cryogenic (sub-zero) treatment parameters such as temperature and holding time on the microstructure (amount of retained austenite) and hardness of extrusion molds produced from the 21NiCrMo2 and 100Cr6 steels were investigated. The 21NiCrMo2 grade extrusion die was carburized for 22.5 h in an endogas (25% CO, 35% N-2 40% H2) atmosphere at 920 degrees C. At the end of the carburization process, the temperature was kept at 850 degrees C, which is the austenitization temperature, for 2 h, followed by cooling in oil at 80 degrees C and remaining in oil for 45 minutes. The carburizing process was not performed for the extrusion molds made of 100Cr6 steel grade. Only the austenitizing heat treatment at 850 degrees C (holding for 2 h) was carried out in this steel. The steel molds which were produced with 21NiCrMo2 and 100Cr6 steels were cryogenically treated at -120 degrees C for 2 h and subsequently tempered at 150 degrees C for 1.5 h. As a result of the cryogenic treatment, the hardness of 21NiCrMo2 steel increased to 840 Hv and the wear resistance of the extrusion die surface was improved. The amount of residual austenite decreased from 20% to 6% after the cryogenic treatment. Due to the effect of the cryogenic process, the surface hardness of the 100Cr6 steel sample increased to similar to 870 Hv, which implies an increase of 4.5%, due to the transformation of residual austenite to martensite. The mass loss, during the wear tests, of the hardened extrusion dies was reduced from 0.1420 mg to 0.0221 mg. The notch impact strength value measured in this condition was 20 J. The 100Cr6 steel after the cryogenic treatment was used to extrude 12 tons of Al alloy in an industrial press. This amount of material is 30% lower than for hot work tool steel. On the other hand, the 100Cr6 steel is more economical and heat treatment is more practical. The extrusion performance of 21NiCrMo2 steel was 50% lower than the hot work tool steel.

Published
2022

3. Novel process for decontamination and additional valorization of steel making dust processing using two-step correlative leaching

Author

Petranikova, M., Ssenteza, V., Lousada, Claudio M., Ebin, B., Tunsu, C., Petranikova, M., Ssenteza, V., Lousada, Claudio M., Ebin, B., and Tunsu, C.

Abstract

Recycling of steel making dusts often targets Zn removal. Other heavy metals such as Mo, W or Cr do not receive as much attention, and the decontamination of the dusts from these constituents is scarcely addressed in the literature. This study presents a novel approach of the selective separation of Mo from steel making dusts using alkaline solutions with low concentrations, before Zn removal using concentrated alkaline medium. Such an approach has never been reported before and can contribute to more efficient decontamination of the steel making dusts and will increase the value of recovered components since Mo can be significantly preconcentrated. Two samples originating from two steel producers were investigated. One sample contained 2.65% of Mo and 1.87% of Zn, and the second sample had 0.61% of Mo and 35.9% of Zn. Temperature was found to have a low impact on the leaching efficiency of Mo, while increased NaOH concentration promoted leaching of Zn. Excellent pre-concentration of Mo was achieved by using a S:L ratio of 1:3. Almost 5170 mg/L Mo, 1000 mg/L W, no Fe and only 2 mg/L Zn were present in the solution after leaching at 30 °C for 30 min. For the samples containing lower concentrations of Mo and high concentrations of Zn, the selectivity of the process was affected when using higher concentrations of NaOH. A final leachate containing 797 mg/L of Mo and only 11 mg/L Zn was obtained after leaching with 0.05 M NaOH. DFT computations showed that the 2D layered structures of MoO3 and WO3 are decisive factors that account for their high solubilites., QC 20200401

Published
2020
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4. Machinability evaluation of multi-directional turning tools

Author

Korcan Firat, Ahmet Murat Pinar, Department of Mechanical and Manufacturing Engineering, Faculty of Technology, Pamukkale University, Denizli, 20160, Turkey, and Institute of Natural and Applied Sciences, Manisa Celal Bayar University, Yunusemre-Manisa, 45140, Turkey

Subjects
Optimization, Machinability, wear, Turning, Machinability evaluation, Computer science, Mechanical engineering, Carbide cutting tools, Rough turning, optimization, surface roughness, Taguchi method, tool, Surface roughness, General Materials Science, Tool wear, Chip breakers, Molybdenum steel, Taguchi methods, Mechanical Engineering, Wear behaviors, Cutting tools, AISI 4140 steel, Wear of materials, Cutting speed, Mechanics of Materials, Orthogonal array, Multi directional, Physical vapor deposition, Carbides, Cemented carbides
Abstract

Multi directional turning tools can perform various operations such as cutting, grooving and profile turning with high performance on their own. Tool change and setting times are reduced considerably with the use of these tools. This study discusses surface roughness and wear behavior for different cutting speeds, chip breaker types and nose radii in the rough turning of AISI 4140 steel with physical vapor deposition coated cemented carbide multi directional turning tool. Experimental results based on Taguchi's L8 orthogonal array are assessed through the analysis of variance, main effects and interaction plots. As a result, optimum roughness and an roughness increase percentage are obtained at 0.803 mu m and 19.92 %, respectively. C1 [Firat, Korcan] Manisa Celal Bayar Univ, Inst Nat & Appl Sci, TR-45140 Yunusemre Manisa, Turkey. [Pinar, Ahmet Murat] Gazi Univ, Dept Mech Educ, Ankara, Turkey. [Pinar, Ahmet Murat] Pamukkale Univ, Technol Fac, Denizli, Turkey.

Published
2020

5. Metallurgical concepts for optimized processing and properties of carburizing steel

Author

Hardy Mohrbacher

Subjects
Toughness, Materials science, Polymers and Plastics, Process (engineering), Distortion control, Alloy, 02 engineering and technology, engineering.material, Integrated manufacturing, Industrial and Manufacturing Engineering, Carburizing, Grain size control, Fatigue resistance, Tooth root fatigue strength, Micro pitting, Molybdenum steel, Niobium microalloying, 020502 materials, Mechanical Engineering, Metallurgy, Plasma nitriding, High temperature carburizing, 021001 nanoscience & nanotechnology, High surface, Electricity generation, 0205 materials engineering, Mechanics of Materials, engineering, 0210 nano-technology
Abstract

© 2016, The Author(s). Carburized steel grades are widely used in applications where high surface near hardness is required in combination with good core toughness as well as high strength and fatigue resistance. The process of carburizing lower to medium carbon containing steel can generally provide this combination of properties and has been practiced for several decades. Such steel is essential in the vehicle power-train, machines and power generation equipment. However, the increasing performance demands by such applications as well as economical considerations forced steel producers to develop better alloys and fabricators to design more efficient manufacturing processes. The present paper describes recent concepts for alloy design optimization of carburizing steel and demonstrates the forthcoming beneficial consequences with regard to manufacturing processes and final properties. ispartof: International Journal of Advanced Manufacturing Technology vol:4 issue:2 pages:105-114 status: published

Published
2016
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