37Mn5钢热变形行为与流变应力模型研究  

Thermal deformation behavior and flow stress model of 37Mn5 steel

作　　者：王孟[1] 洪慧平[1] 王晓明[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《武汉科技大学学报》2010年第2期134-137,共4页Journal of Wuhan University of Science and Technology

摘　　要：利用Gleeble-1500热模拟实验机研究37 Mn5钢在变形温度为800～1 150℃、变形速率为0.1～10 s-1条件下的热压缩变形行为。采用应变硬化率-应力曲线图较精确地获得峰值应力,并用双曲正弦方程描述37 Mn5钢热压缩变形过程中的峰值应力与Zener-Hollomon参数的关系。回归分析得到方程中变形激活能及各材料常数的值,获得37 Mn5钢在高温条件下的流变应力本构方程。结果表明,采用该本构方程计算出的流变应力值与实验所得应力值非常接近。The hot deformation behavior of 37Mn5 steel was investigated with a compression test on Gleeble-1500 simulator at a temperature range of 800～1 150℃ and strain rate range of 0.1-10 s-1.The accurate values of peak stress were obtained from the θ-acurve. A hyperbolic sine equation was employed to describe the relationship between the peak stress and Zener-Hollomon parameter, in which the activation energy of deformation and other constants were obtained using regression analysis. The flow stress constitutive equation of 37Mn5 steel during hot compression was obtained, and the results show that the flow stress of 37Mn5 steel predicted by the proposed models agrees well with the experimental results.

关 键 词：37Mn5钢 热变形 流变应力 双曲线本构方程 

分 类 号：TG142[一般工业技术—材料科学与工程]