A Study on the Microstructures and Mechanical Properties of Ni-Cr-Mo-V Low Alloy Steels
| العنوان: | A Study on the Microstructures and Mechanical Properties of Ni-Cr-Mo-V Low Alloy Steels |
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| المؤلفون: | Mu Geun Jo, Seong Hyeon Ryu, Kyung Il Kim, Dong Eung Kim, Jung In Kim, Kyung Taek Kim, Sang Sub Kim, Gue Serb Cho |
| المصدر: | Korean Journal of Metals and Materials. 60:251-262 |
| بيانات النشر: | The Korean Institute of Metals and Materials, 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Modeling and Simulation, Metals and Alloys, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials |
| الوصف: | Ni-Cr-Mo-V steel alloys for high-speed railway brake discs were prepared to investigate the effect of alloying element contents on the microstructure and mechanical properties. The Cr, Mo, Mn alloying elements were incorporated into the steel alloys, which contained low carbon content in the range 0.16 wt.% ~ 0.21 wt.% to provide sufficient hardenability. The steel alloys were austenitized at 940oC for 1 hour and quenched, and tempered at 610oC. Microstructural study showed a tempered martensitic microstructure with different sized austenite grains and packets. C-Mo alloy with high Mo content and the smallest prior austenite grain size showed the highest hardness and tensile strength. But, the alloy exhibited lower impact toughness than low Mo content alloys. The lowest tensile strength of the low Mo content Mn-Cr alloy, at room temperature and elevated temperature of 600oC, was 1053.4 MPa and 667.2 MPa, respectively. The grain refinement in the C-Mo alloy was considered to be due to the solute drag effect of the Mo element. The absorbed impact energy increased with tempering temperatures, but the impact energy of the three alloys had lower values than the generally guaranteed impact energy of the currently used disk. The low impact toughness of the Mo containing alloys was attributed to the higher Si content and higher tempered hardness of the alloys. A higher thermal conductivity and lower thermal expansion coefficient were obtained in the high Mo content C-Mo alloy, which had a higher Ac3 transformation temperature. |
| تدمد: | 2288-8241 1738-8228 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::7a9945f53fbe92617b4572efd711184c https://doi.org/10.3365/kjmm.2022.60.4.251 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........7a9945f53fbe92617b4572efd711184c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 22888241 17388228 |
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