METALS AND METAL MATRIX COMPOSITES |
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Study on Crack Growth of Cold-rolled Medium Manganese Steel and Quenching and Partitioning Steel |
ZHOU Fengluan1,2, WANG Cunyu1, CAO Wenquan1, DONG Han3
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1 Iron and Steel Research Institute, Special Steel Institute, Beijing 100081, China 2 AVIC Touchstone Testing Innovation Cooperation, Department of technology, Langfang 065000, China 3 Shanghai University, School of material science and engineering, Shanghai 200072, China |
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Abstract The crack propagation of 0.1C-5Mn medium manganese steel with ferrite and metastable austenite as matrix and QP980 steel with ferrite, martensite and metastable austenite as matrix were tested by load control. The crack propagation behavior was characterized by SEM and EBSD. The results show that the crack propagation mechanism is composed of sliding and accumulation damage. In the plastic zone of the crack tip, TRIP effect occurred in both the cold-rolled medium manganese steel and QP980, which transfer into martensite. The content and stability of the metastable austenite in the cold rolled medium manganese steel are higher than that in QP980, and almost all the austenite at the crack tip of QP980 transformed. The fatigue crack propagation rate is reduced by the energy absorbed by phase transition and the crack closure effect.
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Published: 10 May 2021
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Fund:National Key Research and Development Program (2017YFB0304401, 2016YFB0101605) and the National Natural Science Foundation of China (51571048). |
About author:: Fengluan Zhou received a Ph. D. in engineering in June 2020 in Center of Iron and Steel Research Institute, mainly engaged in the study of new material fatigue and fracture, published more than 10 papers. Cunyu Wang, Ph.D., senior engineer.His main research are high strength and high plasticity of the third generation of automotive steel, new generation of ultra-high strength steel, warm (hot) forming technology. He has presided over one project of National Natural Science Foundation of China and one project of National Key Research and Development Program of the 13th Five-Year Plan. More than 100 academic papers have been published, more than 50 of which are included in SCI and EI. More than 10 authorized invention patents. He won the first prize of Metallurgical Science and Technology Award in 2017 and the second prize of National Technical Invention Award in 2018. |
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