82B高碳钢热变形行为研究

采用单道次热压缩实验方法,在Thermomaster-Z型热模拟试验机上模拟高碳钢高速线材热轧变形过程动态再结晶行为,测定82B高碳钢在变形温度为800～1 100℃、变形速率为0.1～50 s-1、变形程度为0～0.60条件下的真应力-应变曲线,利用曲线特征值确定高应变速率下的变形激活能,根据实验结果分析动态再结晶变形条件,建立动态再结晶状态图。

Hot deformation behavior of high carbon steel 82B

Single compression deformation tests were conducted on Thermomaster-Z thermal simulator and dynamic recrystallization behavior of high carbon steel in high speed rolling was investigated.The true stress strain-curves were measured under the conditions of deformation temperature of 800～1 100 ℃,deformation rate of 0.1～50 s-1 and strain of 0～0.60.By means of the curve＇s characteristic value and linear regression,the hot deformation activation energy in the condition of high strain rate for high carbon steel 82B was determined and it equaled 147 kJ/mol.The critical value of dynamic recrystallization occurred is analyzed and the dynamic recrystallization diagram is given.