ESP工艺条件下低碳钢奥氏体动态再结晶数学模型  

Mathematical model of dynamic recrystallization of austenite in low carbon steel under ESP process

作　　者：周晓光[1] 王铎 马鑫 曹光明[1] 刘自成[2] 刘振宇[1] ZHOU Xiaoguang;WANG Duo;MA Xin;CAO Guangming;LIU Zicheng;LIU Zhenyu(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China;Manufacturing Management Department,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819 [2]宝山钢铁股份有限公司制造管理部,上海201900

出　　处：《钢铁研究学报》2024年第1期76-84,共9页Journal of Iron and Steel Research

基　　金：国家重点研发计划资助项目(2022YFB3304800);辽宁省科技专项资助项目(2022JH25/10200001);中国博士后科学基金资助项目(2022T150205,2023M730512)。

摘　　要：采用MMS-200热模拟试验机对低碳钢ESP工艺条件下的动态再结晶行为进行了模拟,建立了基于热变形前晶粒尺寸影响的实验钢动态再结晶数学模型。结果表明:1350℃奥氏体化保温300s可以模拟ESP工艺条件下铸坯的初始组织状态,初始奥氏体晶粒尺寸越大,动态再结晶越难发生;动态再结晶激活能随着初始奥氏体晶粒尺寸的增加而增加,初始奥氏体晶粒尺寸对峰值应变和临界应变的关系系数s没有影响;考虑初始奥氏体晶粒尺寸的影响,建立了实验钢动态再结晶激活能模型,峰值应变模型和动态再结晶动力学数学模型。研究结果为ESP工艺条件下开发高品质薄规格低碳钢和完善组织性能预测模型奠定了理论基础。The dynamic recrystallization behavior of low carbon steel under ESP process was simulated by using MMS-200 thermal simulation tester.Considering the influence of austenite grain size change before deformation,the dynamic recrystallization mathematical model was established.The results show that:the initial microstructure under ESP process condition can be simulated by austenitizing at 1350℃and holding for 300s,and the larger the initial austenite grain size,the more difficult dynamic recrystallization is to occur;the dynamic recrystallization activation energy increases with the increase of the initial austenite grain size,and the initial austenite grain size has no effect on the relationship coefficient s between peak strain and critical strain;considering the effect of initial austenite grain size,dynamic recrystallization activation energy model,peak strain model and dynamic recrystallization dynamic model of experimental steel were established.The research results lay a theoretical foundation for developing high quality thin-gage low carbon steel and improving the prediction model precision of microstructure properties under ESP process conditions.

关 键 词：无头轧制 奥氏体 晶粒尺寸 动态再结晶 数学模型 

分 类 号：TG335.11[金属学及工艺—金属压力加工] TG111.7