Transformation Behavior of Low Carbon Steels Containing Two Different Si Contents  

作　　者：CAI Ming-hui DING Hua ZHANG Jian-su LI Long LI Xiao-bin DU Lin-xiu 

机构地区：[1]College of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China [2]State Key Laboratory of Rolling Automation, Northeastern University, Shenyang 110004, Liaoning, China [3]Technology Center, Baoshan Iron and Steel Group Co, Shanghai 201900, China [4]National Institute for Materials Science, Tsukuba 305-0047, Japan

出　　处：《Journal of Iron and Steel Research International》2009年第2期55-60,共6页

基　　金：Item Sponsored by National Natural Science Foundation of China (50527402)

摘　　要：Continuous cooling transformation behaviors of low carbon steels with two Si contents （0. 50% and 1. 35%） were investigated under undeformed and deformed conditions. Effects of Si contents, deformation, and cooling rates on γ transformation start temperature （Ar3）, phase microstructures, and hardness were studied. The results show that, in the ease of the deformation with the true strain of 0. 4, the length of bainitic ferrite laths is significantly decreased in low Si steel, whereas, the M/A constituent becomes more uniform in high Si steel. An increase in cooling rates lowers the Ar3 greatly. The steel with higher level of Si exhibits higher Ar3, and higher hardness both under undeformed and deformed conditions compared with the steel with a lower Si content. Especially, the influence of Si on At3 is dependent on deformation. Such effects are more significant under the undeformed condition. The hardness of both steels increases with the increase of cooling rates, whereas, the deformation involved in both steels reduces the hardness.Continuous cooling transformation behaviors of low carbon steels with two Si contents （0. 50% and 1. 35%） were investigated under undeformed and deformed conditions. Effects of Si contents, deformation, and cooling rates on γ transformation start temperature （Ar3）, phase microstructures, and hardness were studied. The results show that, in the ease of the deformation with the true strain of 0. 4, the length of bainitic ferrite laths is significantly decreased in low Si steel, whereas, the M/A constituent becomes more uniform in high Si steel. An increase in cooling rates lowers the Ar3 greatly. The steel with higher level of Si exhibits higher Ar3, and higher hardness both under undeformed and deformed conditions compared with the steel with a lower Si content. Especially, the influence of Si on At3 is dependent on deformation. Such effects are more significant under the undeformed condition. The hardness of both steels increases with the increase of cooling rates, whereas, the deformation involved in both steels reduces the hardness.

关 键 词：Si content low carbon steel cooling rate transformation behavior bainitic morphology 

分 类 号：TF513[冶金工程—钢铁冶金] TG142.31[一般工业技术—材料科学与工程]