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| Effect of Annealing Process on Microstructure and Mechanical Property of 1100 MPa Grade TRIP Steel |
| Hong-xiang YIN1,2,Zheng-zhi ZHAO1,2,Ai-min ZHAO1,2,Xiao LI1,2,Han-jiang HU1,2,Jiang-tao LIANG1,2 |
1. Metallurgical Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China
2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Beijing 100083, China |
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Abstract To develop super-high strength TRIP steel for automobile application with good combination of strength and plasticity, an ultra-high-strength TRIP steel 0. 2%C-2. 0%Si-1. 8%Mn was investigated at different intercritical annealing temperatures and bainitic isothermal temperatures. Microstructures were observed by scanning electron microscopy, transmission electron microscopy, electron backscatter diffraction, and X-ray diffraction, and mechanical properties were tested under a uniaxial tensile testing machine. It shows that the best comprehensive mechanical properties were obtained for the experimental steel particularly annealed at 820 �� and austempered at 410 ��. Yield strength of the tested steel mainly depends on ferrite, while the high strength of the tested steel is related to martensite which forms through blocky austenite transformation during cooling and subsequent tensile test attributed to the TRIP effect. Hence, it could be concluded that the grain size of the retained austenite and carbon content in retained austenite are the main reasons for high elongation of the tested steel.
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Received: 07 March 2014
Published: 17 July 2015
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| Fund:Item Sponsored by National Natural Science Foundation of China(51271035) |
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Corresponding Authors:
zhao zheng-zhi
E-mail: zhaozhzhi@ustb.edu.cn
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2015, Vol. 22 
