High-strength medium Mn quenching and partitioning steel with low yield ratio

被引：33
作者：
He, B. B. [1 ,2 ]
Wang, M. [1 ,2 ]
Liu, L. [1 ,2 ]
Huang, M. X. [1 ,2 ]
机构：
[1] Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China
[2] Univ Hong Kong, Shenzhen Inst Res & Innovat, Shenzhen 518000, Peoples R China
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2019年 / 35卷 / 17期
基金：
中国国家自然科学基金;
关键词：
Medium Mn steel; austenite stability; TRIP; yield ratio; heterogeneous structure; INDUCED PLASTICITY STEEL; MECHANICAL-PROPERTIES; RETAINED AUSTENITE; TRANSFORMATION; MARTENSITE; DUCTILITY; SEGREGATION; CARBON; MICROSTRUCTURE; DEFORMATION;
D O I：
10.1080/02670836.2019.1566046
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A new microstructural design is proposed to develop a strong and ductile quenching and partitioning (Q&P) steel with low yield ratio. This steel has a heterogeneous dual phase microstructure which is developed by varying austenite thermal stability through Mn segregation. The heterogeneous microstructure contains large austenite grains which contribute to the low yield strength. The ultra-high tensile strength and good ductility are ascribed to the enhanced strain hardening behaviour resulted from the continuous transformation-induced plasticity (TRIP) effect. The present microstructural design enables a conventional medium Mn steel with high tensile strength, good ductility and low yield ratio, which promises easy forming and potential applications in automotive industries. This paper is part of a Thematic Issue on Medium Manganese Steels.
引用
收藏
页码：2109 / 2114
页数：6
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