Effect of strain rate on deformation behavior of TRIP steels |
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| Authors: | Zhongping He Yanlin He Yuntao Ling Qihao Wu Yi Gao Lin Li |
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| Affiliation: | 1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, People’s Republic of China;2. Center for Structural and Functional Materials Research and Innovation and Department of Metallurgical and Materials Engineering, University of Texas at El Paso, 500 W. University Avenue, El Paso, TX 79968, USA;1. Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, John Street, Hawthorn VIC 3122, Australia;2. Faculty of Engineering, Computer & Mathematical Sciences, University of Adelaide, SA 5005, Australia;3. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;1. Institute of Advanced Steels and Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People''s Republic of China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, People''s Republic of China;3. State Key Lab of Development and Application Technology of Automotive Steels, Baosteel Research Institute, Shanghai 201900, People''s Republic of China;1. State Key Laboratory of Advanced Metallurgy & School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xue Yuan Lu 30, Beijing 100083, PR China;2. Central Iron and Steel Research Institute, Xue Yuan Nan Lu 76, Beijing 100081, PR China;1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, South Korea;2. Technical Research Center, POSCO, Pohang 790-300, South Korea;3. National Institute for Nanomaterials Technology (NINT), Pohang University of Science and Technology (POSTECH), Pohang 790-784, South Korea;4. Max-Planck-Institute for Eisenforshung, Dusseldorf, Germany |
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| Abstract: | Tensile deformation behavior of Si–Mn TRIP (TRansformation Induced Plasticity) steel with vanadium and without vanadium and the DP (Dual Phase) steel of the same composition were studied in a large range of strain rate (0.001–2000 s?1) by routine material testing machine, rotation disk bar–bar tensile impact apparatus and high-speed material testing machine of servo-hydraulic type. In situ measurement of the transformation of retained austenite was performed by means of X-ray stress apparatus in order to have detailed knowledge about the transformation of retained austenite at quasi-static tensile. Microstructure of steels before and after tensile were observed by means of optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). It is shown that there is no yield plateau observed on the stress–strain curve at quasi-static condition for TRIP steel containing vanadium because the vanadium carbide suppress the formation of Cottrell atmosphere in matrix. Retained austenite of Si–Mn TRIP steel containing vanadium transforms to martensite at loading stress of 502 MPa (its yielding strength is 486 MPa), while the transformation of retained austenite in matrix of Si–Mn TRIP steel without vanadium happens when its yielding process is finished at quasi-static tensile. It is confirmed that phase transformation of retained austenite in TRIP steel is strain induced phase transformation. It is noted that tensile elongation of TRIP steel at dynamic tensile is always lower than that at quasi-static tensile. That is because gradually strain induced phase transformation of retained austenite in TRIP steel is suppressed by deformation localization at dynamic tensile. |
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