奥氏体晶粒尺寸对热轧低碳微合金钢动态再结晶临界应变的影响  

Effect of prior austenite grain size on critical strain of dynamic recrystallization of hot rolled low carbon microalloyed steel

作　　者：李凡 葛章琦 邢军 王永强[1] 黎俊良 吴保桥 LI Fan;GE Zhang-qi;XING Jun;WANG Yong-qiang;LI Jun-liang;WU Bao-qiao(School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243032,China;Technical Center,Maanshan Iron and Steel Co Ltd,Maanshan 243000,China)

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243032 [2]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243000

出　　处：《材料热处理学报》2021年第11期51-59,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然基金(51971003);安徽高校自然科学研究项目(重点)(KJ2019A0070);安徽省高校优秀青年人才支持计划(gxyq2019023);马钢产学研项目(KFG-2019068)。

摘　　要：利用热模拟、组织分析等手段研究了初始奥氏体晶粒尺寸对热轧低碳微合金钢动态再结晶临界应变的影响。在建立热变形Arrhenius本构模型的基础上,引入了Zenner-Hollomon因子描述变形温度和应变速率对热变形的影响,最终建立了初始奥氏体晶粒尺寸与Z参数和临界应变的函数关系模型。结果表明:奥氏体晶粒尺寸越小,动态再结晶临界应变也越小,越有利于动态再结晶的发生。利用所建立的函数关系模型计算出的临界应变值与试验值接近,该模型能较准确的预测热轧低碳微合金钢的临界应变值。Effect of prior austenite grain size on critical strain of dynamic recrystallization of hot rolled low carbon microalloyed steel was studied by means of thermal simulation and microstructure analysis.Based on the Arrhenius constitutive model of hot deformation,the Zenner Hollomon factor was introduced to describe the effect of deformation temperature and strain rate on hot deformation.Finally,the function relation model of prior austenite grain size with Z parameter and critical strain was established.The results show that the smaller the grain size of austenite is,the smaller value the critical strain of dynamic recrystallization is,which is more conducive to the occurrence of dynamic recrystallization.The critical strain value calculated by the function relation model is close to the experimental value,and the model can accurately predict the critical strain value of dynamic recrystallization of hot rolled low carbon microalloyed steel.

关 键 词：奥氏体晶粒尺寸 低碳微合金钢 动态再结晶 临界应变 

分 类 号：TG142.3[一般工业技术—材料科学与工程]