Transformation Behavior of Low Carbon Steels Containing Two Different Si Contents

钢铁研究学报(英文版), 2009, 16(2): 55-60.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.College of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China;

2.College of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China;College of Materials and Metallurgy, 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

5.College of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China;

6.State Key Laboratory of Rolling Automation, Northeastern University, Shenyang 110004, Liaoning, China

基金项目: National Science Foundation of China(50527402)

Transformation Behavior of Low Carbon Steels Containing Two Different Si Contents

CAI Ming-hui ^1, , DING Hua ^2, , ZHANG Jian-su ^3, , LI Long ^4, , LI Xiao-bin ^5, , DU Lin-xiu ^6,

1.College of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China;

2.College of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China;College of Materials and Metallurgy, 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

5.College of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China;

6.State Key Laboratory of Rolling Automation, Northeastern University, Shenyang 110004, Liaoning, China

Keywords： Si content

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 resuhs show that, in the case of the deformation with the true strain of 0. 4, the length of bainitic ferrite laths is sig-nificantly decreased in low Si steel, whereas, the M/A constituent becomes more uniform in high Si steel. An in-crease in cooling rates lowers the Ar3 greatly. The steel with higher level of Si exhibits higher Ar3, and higher hard-ness both under undeformed and deformed conditions compared with the steel with a lower Si content. Especially, the influence of Si on Ar3 is dependent on deformation. Such effects are more significant under the undeformed condi-tion. The hardness of both steels increases with the increase of cooling rates, whereas, the deformation involved in both steels reduces the hardness.

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Transformation Behavior of Low Carbon Steels Containing Two Different Si Contents

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