Stability and TRIP Effect of Retained Austenite of Medium Manganese Q&P Steel
LI Hui1, 2, CHEN Jiayong3, DUAN Xiaoge4, JIANG Haitao4
1 College of Engineering, Yantai Nanshan University, Yantai 265700; 2 National Engineering Research Center for Plastic Working of Aluminum Alloys, Shandong Nanshan Aluminum Co. Ltd., Yantai 265713; 3 BYD Auto Industry Company Limited, Shenzhen 518118; 4 Engineering Research Institute,University of Science and Technology Beijing, Beijing 100083
Abstract: The influence of the macro stress state on retained austenite stability of a quenched and partitioned (Q&P) steel with Mn content of 7% was investigated by uniaxial tension and plane strain experiments. To evaluate the volume fraction of retained austenite under variable plastic strain, X-ray diffraction method was adopted. The deformation mechanism of the medium manganese Q&P steel was studied by observing the tensile curve, analyzing the change in microstructure of Q&P steel in deformation process by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the stress state had a great effect on the stability of retained austenite, and the plane strain was more conducive to the performance of the transformation induced plasticity (TRIP) effect. The tensile deformation characteristics of the 7Mn Q&P steel can be attributed to the interaction of ultrafine grain hardening mechanism and TRIP effect. The plastic deformation mechanism of the medium Q&P steel was mainly TRIP effect, the thin film and fine globular particles were more stable.
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2018, Vol. 32 
