Role of martensite/austenite constituents in novel ultra-high strength TRIP-assisted steels subjected to non-isothermal annealing

被引:40
作者
Gu, Xingli [1 ]
Xu, Yunbo [1 ]
Peng, Fei [1 ]
Misra, R. D. K. [2 ]
Wang, Yuan [1 ]
机构
[1] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Liaoning, Peoples R China
[2] Univ Texas El Paso, Dept Met Mat & Biomed Engn, El Paso, TX 79968 USA
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2019年 / 754卷
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Transformation induced plasticity steel; Quenching and partitioning steel; Microstructures and mechanical properties; Fresh martensite; Retained austenite; RETAINED AUSTENITE; MECHANICAL-PROPERTIES; MICROSTRUCTURE; TRANSFORMATION; STABILITY; CARBON; ELONGATION; MORPHOLOGY; EVOLUTION; ALUMINUM;
D O I
10.1016/j.msea.2019.03.070
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A novel ultra-high strength transformation-induced plasticity (TRIP) steels with submicron-size martensite/austenite (M/A) constituents was processed by non-isothermal annealing process and compared with quenching and partitioning (Q&P) steels. The microstructure was characterized by means of SEM equipped with EPMA, XRD, EBSD and TEM and its effects on tensile strength and ductility were studied. The non-isothermal annealing significantly refined the parent austenite grains and enhanced inhomogeneous distribution of C atoms within the grains. Moreover, a large fraction of M/A constituents were separated and refined to hundreds of nanometers through bainite transformation in TRIP steels, while blocky retained austenite mainly existed near the carbon-rich prior grain boundaries in Q&P steel. TRIP steels had a higher content of less stable retained austenite by isothermal bainite transformation than Q&P steel, thereby favoring for improving the ductility. The contribution of fresh martensite to the ultimate tensile strength increased gradually from 49.7% to 67.3% with increase in the volume fraction of fresh martensite in TRIP steels. Optimizing the volume fraction and size of M/A constituents was important to obtain a high ultimate strength with desired ductility. The excellent mechanical properties were obtained in TRIP-350 (austempering at 350 degrees C) with ultimate tensile strength of 1011 MPa, total elongation of 28.80% and the product of strength and elongation (PSE) of 29.1 GPa%, exceeded the properties of Q&P steel.
引用
收藏
页码:318 / 329
页数:12
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