摘要
以低碳Si-Mn-Nb贝氏体钢为研究对象,利用相变仪进行贝氏体区等温实验。通过对热膨胀曲线的分析,获得了贝氏体相变动力学曲线;分析了奥氏体化条件对贝氏体相变动力学的影响;分析了奥氏体化条件及贝氏体区等温温度对贝氏体组织形态的影响。结果表明:随着奥氏体晶粒尺寸的细化,贝氏体相变动力学进程减缓,且相同等温温度下对应的贝氏体体积分数降低;随着贝氏体区等温温度的升高,贝氏体板条宽度增加,马氏体/奥氏体混合组织体积分数提高。
Taking the low carbon Si-Mn-Nb kainitic steel as research object,the bainite isothermal experiments were carried out by dilatometer.The bainite transformation binetics curves were obtained by analyzing the thermal expansion curve.The effects of austenizing condition on the phase transformation kinetics of bainite were studied.The effects of austentizing condition and bainite isothermal process on the morphology of bainitic microstructure were investigated.The results show that with the refinement of austenite grain size,the process of bainite transformation kinetics slows down,and the bainite volume fraction corresponding to the same isothermal temperature decreases.In addition,with the increase of bainite isothermal temperature,the width of bainitic lath increases,and the volume fraction of martensite/austenite mixed microstructure increases.
作者
英焕岩
刘昊炎
蓝慧芳
柳萌
YING Huanyan;LIU Haoyan;LAN Huifang;LIU Meng(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)
出处
《热加工工艺》
北大核心
2019年第10期98-101,共4页
Hot Working Technology
基金
国家级大学生创新创业训练计划资助项目(160110)
