Process Design and Mechanical Properties of Q-P-T Steel Containing Al Instead of Si
KANG Ren-mu1,2,LIU Guo-quan1,WU Wen-dong2,LI Na1,YU Hui1
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1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 2. Chuanwei Group Co Ltd, Chengdu 610100, Sichuan, China
The heat treatment process parameters of a Q-P-T steel containing 1.79%Al instead of Si were designed based on the research of the austenite grain growth feature and the CCE model. Mechanical properties of experimental steel were tested and the steel microstructures were studied by using OM, SEM, TEM and XRD. The results show that the experimental steel has good strength and ductility. When the tensile strength is 1260MPa, it′s total elongation reaches 18%. Meanwhile, it is also found that the changes during partitioning-tempering of the initial lath martensite are decisive factors for the mechanical properties and the way of mechanical property change with partitioning-tempering time is of the same characteristics of the property change of martensite with tempering time.
KANG Ren-mu1,2,LIU Guo-quan1,WU Wen-dong2,LI Na1,YU Hui1.
Process Design and Mechanical Properties of Q-P-T Steel Containing Al Instead of Si[J]. Journal of Iron and Steel Research, 2012, 24(08): 32-37