摘要
利用热／力模拟试验机对Cr15Mn9Cu2Ni1N奥氏体不锈钢进行热压缩试验，在变形温度为950℃-1200℃，应变速率为0．01s^-1-2．5s^-1,得到其流变应力应变曲线。以经典的双曲正弦形式的模型为基础，采用线性回归分析方法建立了这种钢的热变形本构方程，其中热变形激活能为488．16kJ／mol。与Ni—Cr奥氏体不锈钢相比，由于这种钢具有较高Mn含量，热变形激活能相对较高。通过压缩试样热变形后的显微组织观察发现，这种钢在温度为1000℃变形时，再结晶开始发生，1100℃以上时，可获得完全再结晶组织。
Hot compression tests of Cr15Mn9Cu2Ni1N austenitic stainless steer were periormeu uy 8 testing machine. The flow stress-strain curves have been obtained in the deformation temperature range of 950℃ to 1200℃ and strain rate range of 0. 01s-t to 2.5s-1. By using the linear regression analysis method, the hot deformation constitutive equation based on hyperbolic sine form model was obtained for this steel, and hot deformation activation energy is 488. 16kJ/mol in this constitutive equation. Due to higher content of Mn, the hot deformation activation energy of this steel is relatively higher than that of conventional Ni-Cr austenitic stainless steels. Microstructures of compression specimens after hot deformation were analyzed. Partial dynamic recrystallization occurs at 1000℃ and completely dynamic recrystallization microstrucmre can be obtained at temperature above 1100℃.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2009年第5期96-100,共5页
Journal of Plasticity Engineering
关键词
奥氏体不锈钢
热变形
本构方程
激活能
austenitic stainless steel
hot deformation
constitutive equation
activation energy
