期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 78, 期 -, 页码 173-186出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2015.11.004
关键词
Phase transformation; Twinning; TRIP; TWIP; Metallic material
资金
- National Natural Science Foundation of China
- BaoSteel Group Co. Ltd [U1460203]
- International Science &Technology Cooperation Program of China [2015DFG51950]
- Research Grants Council of Hong Kong [HKU719712E, HKU712713E, 17203014]
- National Science Foundation of China [51301148]
The additional deep cryogenic treatment process prior to intercritical annealing was employed to tailor the mechanical stability of austenite grains in a new medium Mn steel. As a consequence, the medium Mn steel after intercritical annealing contains the austenite grains with different mechanical stability due to the different grain size and C content. The large austenite grains with low C content transform to martensite prior to the strain of 9.5% due to their low mechanical stability and provide the transformation-induced plasticity (TRIP) effect during tensile test. On the other hand, the small austenite grains with high C content have high mechanical stability and proper stacking fault energy, therefore do not transform to martensite but offer the twinning-induced plasticity (TWIP) effect from 9.5% strain up to fracture. Subsequently some of the twinned austenite grains provide the nucleation site for martensite formation from the strain of 26.2% up to fracture, providing the TRIP effect again in the large strain regime. In summary, the present novel medium Mn steel has TRIP effect firstly, followed by TWIP effect and then TWIP + TRIP effects during tensile test, therefore demonstrating enhanced work hardening behavior and excellent tensile properties. (C) 2015 Elsevier Ltd. All rights reserved.
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