42CrMo钢的热压缩流变应力行为

来源期刊：中南大学学报(自然科学版)2008年第3期

论文作者：蔺永诚 陈明松 钟掘

文章页码：549 - 549

关键词：42CrMo钢；热压缩变形；流变应力；本构方程

Key words：42CrMo steel; hot compression deformation; flow stress; constitutive equation

摘    要：为实现42CrMo钢锻造的数值模拟与合理制定其热成形工艺参数，采用Gleeble-1500热模拟实验机研究工业用42CrMo钢在变形温度为850~1 150 ℃和应变速率为0.01~50 s^-1条件下的流变应力行为。通过线性回归分析确定42CrMo钢的应变硬化指数以及形变表观激活能，获得42CrMo钢高温条件下的流变应力本构方程，并验证该流变应力本构方程的准确性。研究结果表明：42CrMo钢在热压缩变形过程中发生了明显的动态回复与动态再结晶，流变应力随应变速率的增加而增加，随温度的升高而降低；流变应力的预测值与实验值较吻合，而且预测的最大相对误差仅为4.54%。

Abstract: In order to realize numerical simulation of forging and establish the hot formation process parameters for 42CrMo steel, the flow stress behaviors of 42CrMo steel were investigated in the temperature range of 850-1 150 ℃ and strain rate of 0.01-50 s-1 on Gleeble-1500 thermo-simulation machine. The strain hardening exponent and deformation activation energy were evaluated by linear regression analysis, and the flow stress constitutive equation of 42CrMo steel during hot compression was obtained. The results show that the dynamic recover and dynamic recrystallization occur obviously during hot compression of 42CrMo steel. The flow stress increases with the increase of strain rates and decreases with the increase of temperature. The flow stress of 42CrMo steel predicted by the proposed models well agrees with experimental results, and the maximum relative error between the predicted and experimental results is only 4.54%.

基金信息：国家重点基础研究发展规划资助项目
中国博士后科学基金资助项目
中南大学博士后科学基金资助项目