摘要
通过热模拟试验对临界区变形实现低碳微合金钢的晶粒超细化进行了研究,并结合SEM、应力应变曲线和EBSD对超细晶组织进行了表征和分析。结果表明,采用临界区变形工艺制备了有效晶粒尺寸约1μm的超细组织,该组织由超细晶铁素体和细晶粒状贝氏体组成。本试验中,随着临界区变形温度的降低,晶粒细化的程度在670℃时达到极限。此晶粒细化是变形诱导铁素体相变和先共析铁素体动态再结晶共同作用的结果,其中变形诱导铁素体相变起主要作用。
Grain ultrafining of a low-carbon microalloyed steel realized by intercritical deformation was investigated through thermal simulation test,and the refined microstructure was characterized and analyzed by combining SEM,stress-strain curve and EBSD. The results show that the refined microstructure with effective grain size of 1 μm is fabricated through intercritical deformation. This microstructure is consisted of ultrafine ferrite and fine granular bainite. In this work,with the temperature of intercritical deformation decreasing,the degree of grain refinement reaches its maximum at 670 ℃. The mechanism of such grain refinement is the combined action of deformation induced ferrite transformation and dynamic recrystallization of the pro-eutectoid ferrite,with the deformation induced ferrite transformation playing the major role.
作者
李拔
刘清友
贾书君
陈健
Li Ba;Liu Qingyou;Jia Shujun;Chen Jian(Institute of Engineering Steels, Central Iron and Steel Research Institute, Beijing 100081, China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第5期133-138,共6页
Heat Treatment of Metals
基金
国家重点研发计划(2017YFB0304901)
关键词
低碳微合金钢
临界区变形
晶粒超细化
形变诱导铁素体相变
动态再结晶
low-carbon microalloyed steel
intercritical deformation
grain uhrafining
deformation induced ferrite transformation
dynamic recrystallization
