形变温度对42CrMo钢塑性成形与动态再结晶的影响  

Effects of deformation temperatures on plastic formation and microstructure evolution of 42CrMo steel

作　　者：蔺永诚[1] 陈明松[1] 钟掘 

机构地区：[1]中南大学机电工程学院,现代复杂装备设计与极端制造教育部重点实验室,湖南长沙410083

出　　处：《材料热处理学报》2009年第1期70-74,共5页Transactions of Materials and Heat Treatment

基　　金：国家重点基础研究发展规划资助项目(2006CB705401);中国博士后科学基金资助项目(20070410302);中南大学博士后基金(2007);国家自然科学基金(50805147)

摘　　要：以热物理模拟试验为基础,得到42CrMo钢发生动态再结晶的数学模型。采用热-力耦合的弹塑性有限元法对42CrMo钢圆柱试样的热变形过程进行了数值模拟,讨论了形变温度对42CrMo钢塑性成形与动态再结晶的影响。模拟结果表明,热变形过程中,试样各部位变形不均,心部的等效应变最大,变形不均匀性在950℃附近达到最大值;试样各部位的等效应力大小分布不均,其最大值在低温时一般出现在心部与粘着区/自由变形区的交界处,高温时一般出现在粘着区;动态再结晶分数随着形变温度升高而增大,当形变温度较低、压下量较大时也会发生较大程度的动态再结晶;试样各部位的动态再结晶晶粒大小分步不均,再结晶晶粒随形变温度升高而迅速粗化。Based on thermo-simulation experimental results, dynamic recrystallization models of 42CrMo steel were derived. Effects of deformation temperatures on the formation and dynamic recrystallization of 42CrMo steel were simulated by finite element method. The results show that the deformation of specimen is inhomogeneous, and the effective strain at the center of the specimen is maximum. The deformation inhomogeneity is the most serious when the deformation temperature is 950℃ . The distribution of the effective stress in the specimen is also inhomogeneous. The maximum effective stress lies in small deformed areas when the deformation temperatures are high, while the common boundary of the large and small deformed areas for relatively lower deformation temperatures. The dynamic recrystallization fraction increases with the increase of deformation temperature. Distribution of dynamic recrystallization grain size is not uniform in the deformed specimen, and dynamic recrystallization grain sizes become fine when deformation temperatures decrease.

关 键 词：42CRMO钢 动态再结晶 数值模拟 晶粒尺寸 

分 类 号：TG142.33[一般工业技术—材料科学与工程]