20CrMnTi钢热压缩实验研究  

Hot Compression Tests on 20CrMnTi Steel

作　　者：翟增高 刘华平 皇涛[2] 陈拂晓[2] 

机构地区：[1]洛阳中重发电设备有限责任公司,河南洛阳471003 [2]河南科技大学材料科学与工程学院,河南洛阳471023

出　　处：《材料开发与应用》2016年第4期70-75,共6页Development and Application of Materials

基　　金：国家自然科学基金项目"汽车驱动桥准双曲面齿轮抗疲劳制造新方法的探索与试验研究"(51075121)

摘　　要：使用Gleeble-1500D热模拟试验机对20CrMnTi钢进行等温压缩实验,选择应变速率为0.01、0.1、1和5 s-1,变形温度为900℃、950℃、1 000℃、1 050℃和1 100℃;通过金相观察,分析了变形参数对流变应力的影响;采用Arrhenius型模型建立流变应力本构方程。结果表明,20CrMnTi钢动态再结晶的显微组织受变形条件影响显著;流变应力随变形温度升高而减小,随应变速率的提高而增大;用Arrhenius型方程描述20CrMnTi钢热变形行为时,其变形激活能Q为327.874 9 k J/mol。The hot compression tests of 20CrMnTi steel were performed？ using Gleeble-1500D machine. The strain rates were 0.01, 0. 1, 1 and 5 s-l and the temperatures were 900, 950, 1 000, 1 050 and 1 100 ℃. The effects of parameters on flow stress were analyzed via microscopic examination. The results show that the deformation conditions have significant effects on the microstrueture of 20CrMnTi steel after dynamic recrystallization. The flow stress decreases as deformation temperature increases and increases with the increase of strain rate. The deformation activation energy of 20CrMnTi steel during hot deformation is 327. 8749 kJ/mol by Arrhenius equation.

关 键 词：20Cr MN Ti钢 热压缩 流变应力 组织演变 本构模型 

分 类 号：TG142.3[一般工业技术—材料科学与工程]