METALS AND METAL MATRIX COMPOSITES |
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Microstructure and Mechanical Properties of Fe-Mn-Al-Nb Light-weight Cryogenic Steel |
HE Jinshan1, FANG Ping1, WANG Xitao1,2, WU Huibin1
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1 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; 2 Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Science), Jinan 250014, China |
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Abstract In this work, a Fe-Mn-Al-Nb light-weight cryogenic steel with low stacking faults and stable austenite was designed. After tempering at 680 ℃ for 2.5 h, the yield strength and ultimate strength have reached 442 MPa and 658 MPa respectively. At the same time, its cryogenic impact absorbed energy was 148 J, which has improved by 80—120 J, compared with conventional Ni cryogenic steels. By microstructure characterization after low temperature impact test, it was found that compatible deformation by lots of nanotwins has led to the large improvement of low temperature toughness. In addition, the precipitation of a large amount of nano-size NbC has improved the tensile strength with little influence on elongation after tempering.
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Published: 28 January 2021
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Fund:The National Key Research and Development Project (2017YFB0305003-01). |
About author:: Jinshan He, the assistant professor of Collaborative Innovation Center of Steel Technology, received her Ph.D. from RWTH Aachen University in 2018. Her recent research interest is on the micromechanism and simulation of damage behavior for metals during service, especially for the steels and superalloys. Huibin Wu, Collaborative Innovation Center of Steel Technology, professor, doctoral supervisor. He was a visiting scholar at the School of Engineering, Wayne State University, USA, 2013—2014. At present, he is mainly engaged in research on advanced processing technologies of materials, research and development of high quality steel structural materials, and microstructure control technology of corrosion/wear resistance/low temperature service materials. He has undertaken 15 national and provincial research projects and more than 50 school-enterprise cooperation projects. He has published more than 120 academic papers, edited 2 monographs and applied for 36 Chinese invention patents. |
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