硅含量对低碳贝氏体相变动力学和性能的影响  

Effect of Si content on kinetics of bainitic transformation and properties of low carbon bainite steels

作　　者：刘曼 徐光[1] 田俊羽 魏智睿 张庆枭 LIU Man;XU Guang;TIAN Jun-yu;WEI Zhi-rui;ZHANG Qing-xiao(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室

出　　处：《钢铁研究学报》2019年第11期982-987,共6页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51874216,51274154,51704217);湖北省科技创新重大专项资助项目(2017AAA116)

摘　　要：设计了3种不同Si含量的低碳贝氏体钢,进行了不同温度下等温淬火热处理热模拟实验、X-射线衍射和拉伸实验等,研究Si含量对贝氏体相变动力学和贝氏体钢性能的影响。结果表明,随Si含量增加,贝氏体相变量降低,动力学方程参数b减小,n增大。另外,随贝氏体相变温度增加,参数b减小,n增大。而且在较低相变温度下,因Si含量不同造成参数b和n的值的差异更大,说明低温下Si含量对贝氏体相变动力学的影响更大。此外,Si含量越低,因相变温度不同造成贝氏体相变孕育期和完成时间的差异逐渐增大,表明随Si含量的增加,Si对贝氏体相变动力学的影响降低。最后,随着Si含量的增加,试样抗拉强度和伸长率均逐渐增加。研究结果为优化低碳贝氏体钢成分设计、调控其力学性能提供了参考。Three kinds of low carbon bainitic steels with different silicon contents were designed. The isothermal quenching heat treatment experiments at different temperatures, X-ray diffraction and tensile tests were carried out to study the effect of Si content on the kinetics of bainitic transformation and properties of low carbon bainite steels. The results show that the amount of bainite decreases, the kinetic equation parameter b decreases and n increases with the increase of Si content. In addition, with the increase of bainitic transformation temperature, parameter b decreases while n increases. Moreover, at lower phase transition temperatures, the difference in the values of parameters b and n is greater due to the difference in Si content, indicating that the Si content at low temperature has a greater influence on the transformation kinetics of bainite. Moreover, with the lower Si content, the difference in incubation period and completion time of bainitic transformation will gradually increase due to different transformation temperatures, indicating that the impact of Si content on bainitic transformation kinetics decreases with the increase of Si content. Finally, with the increase of Si content, the tensile strength and elongation of specimens increase gradually. The results provide the theoretical reference for optimizing the composition design and controlling its mechanical properties in low carbon banitic steels.

关 键 词：SI 贝氏体 相变动力学 孕育期 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]