45Cr4NiMoV合金钢热变形的本构模型  

Constitutive model of 45Cr4NiMoV steel for hot forming process

作　　者：陈学文[1,2] 陈天安[1] 朱美玲[1] 周会军[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]华中科技大学模具技术国家重点试验室,湖北武汉430074

出　　处：《金属热处理》2015年第2期152-155,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(51072240);华中科技大学材料成形与模具技术国家重点实验室开放基金(2010-P09)

摘　　要：在Gleebles-1500热模拟试验机上,研究了45Cr4NiMoV合金钢在变形温度为800-1150℃、应变速率为0.002-5 s^-1、最大变形量为60%条件下的热变形行为。采用Zener-Hollomon参数法来构建合金的本构模型。通过真应力-应变曲线,发现45Cr4NiMoV合金钢在热压缩变形过程中发生了动态再结晶,分析了温度、应变速率对动态再结晶的影响,并通过金相试验得到了验证。误差分析表明,所建立的本构模型能较好地反映出其高温流变特性。Hot deformation behaviors of 45Cr4NiMoV alloy steel were investigated in the temperature range of 800-1150℃ and strain rate of 0. 002-5 s^-1 on Gleeble-1500D thenno-simulation machine, and the maximum deformation degree is 60%. The alloy constitutive model was constructed using the Zener-Hollomon parameter method. From the true strain-stress curves, it is found that dynamic recrystallization oecures in the hot compression deformation. The influence of temperature and strain rate on dynamic recrystallization was analyzed, and it was verified by metallographic test. The error analysis shows that the high temperature rheological properties can be reflected preferably by the established constitutive model.

关 键 词：45Cr4NiMoV合金钢 热变形 本构模型 动态再结晶 

分 类 号：TG317[金属学及工艺—金属压力加工]