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
周晓光 1王铎 1马鑫 1曹光明 1刘自成 2刘振宇1
作者信息
- 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
- 折叠
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300 s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.
Abstract
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 1 350 ℃ and holding for 300 s,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Key words
endless rolling/austenite/grain size/dynamic recrystallization/mathematical model引用本文复制引用
基金项目
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)
中国博士后科学基金资助项目(2023M730512)
出版年
2024
NETL
NSTL
维普
万方数据