The hot deformation behavior of a medium-Mn steel was studied in terms of hot compression flow curves in the temperature range of 850–1050 ℃ and strain rates of 0.05–10 s-1.The thermo-mechanical analysis was carried out and suggested that the microstructure during deformation was completely austenite which had high tendency for dynamic recrystallization（DRX）.The flow behavior was characterized by significant flow softening at deformation temperatures of 950–1050 ℃ and lower strain rates of 0.05–5 s-1, which was attributed to heating during deformation, DRX and flow instability.A step-by-step calculating procedure for constitutive equations is proposed.The verification of the modified equations indicated that the developed constitutive models could accurately describe the flow softening behavior of studied steel.Additionally, according to the processing maps and microstructure analysis, it suggested that hot working of medium Mn steel should be carried out at 1050 ℃, and the strain rate of 0.05–10 s-1 resulted in significantly recrystallized microstructures in the in steel.The flow localization is mainly flow instability mechanism for experimental steel.
类型: 期刊论文
作者: Ning Yan,Hong-Shuang Di,Hui-Qiang Huang,R.D.K.Misra,Yong-Gang Deng
来源: Acta Metallurgica Sinica(English Letters) 2019年08期
年度: 2019
分类: 工程科技Ⅰ辑,工程科技Ⅱ辑
专业: 汽车工业
单位: State Key Laboratory of Rolling and Automation,Northeastern University,Laboratory for Excellence in Advanced Steel Research,Department of Metallurgical, Materials and Biomedical Engineering, University of Texas El Paso
基金: financially supported by the National Natural Science Foundation of China (No.51775102),the National key research and development plan (2017YF0703001)
分类号: U465
页码: 1021-1031
总页数: 11
文件大小: 6687K
下载量: 15
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