郭俊锋,周旭东,李汉

• 1:河南科技大学材料科学与工程学院

摘要(Abstract)：

利用Gleeble-1500D热模拟试验机,在应变速率为0.01~10 s-1,变形温度为1000~1150℃条件下对铸态27Si Mn钢进行等温恒应变速率压缩试验。通过真应力-真应变曲线,分析了应变速率和变形温度对流变应力的影响规律,建立了铸态27Si Mn钢热变形时的本构方程和热加工图。结果表明,铸态27Si Mn钢高温变形时的峰值应力随应变速率的增大和变形温度的降低而升高;变形激活能为Q=369.0 k J/mol;热变形失稳区域集中在变形温度1000~1060℃、应变速率为1~10 s-1的区域内;最优热加工条件为变形温度1130~1150℃,应变速率4~10 s-1的区域,此时表现为典型的动态再结晶,对应的峰值效率达到35%。

关键词(KeyWords)： 铸态27SiMn;热变形;本构方程;热加工图

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 郭俊锋,周旭东,李汉

DOI: 10.13289/j.issn.1009-6264.2014.12.023

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