690合金高温连续变形动态再结晶行为  

Dynamic recrystallization behavior of Inconel 690 during hot continuous deformation

作　　者：谭化超 董建新[1] 张麦仓[1] 姚志浩[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2013年第12期1607-1614,共8页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(50831008)

摘　　要：应用液压机对690合金圆锥试样在3种不同温度下(1100、1140和1180℃)进行连续压缩变形实验,利用光学显微镜和背散射衍射技术研究690合金在热加工过程的动态再结晶行为.研究发现:在连续热压缩变形过程中动态再结晶以三叉晶界形核—原始晶界形核—孪晶形核(孪晶界和孪晶碎化)—晶内形核的顺序发展,而孪晶促进了690合金的再结晶过程.Continuous hot deformation testing of Inconel 690 cone samples at three different temperatures （1100, 1140 and 1180 ℃） was performed with a hydraulic press machine. Dynamic recrystallization in the alloy during con- tinuous hot deformation was studied by optical microscopy and back scattering diffraction. It is found that dynamic recrystallization in Inconel 690 happens during continuous hot compression deformation. The nucleation of dynamic recrystallization is in the order of triple junctions of grains → strain-induced boundary migration → twin boundaries → inside of grains, and the twin promotes the recrystallization process of Inconel 690.

关 键 词：高温合金 镍合金 高温试验 变形 动态再结晶 

分 类 号：TG146.15[一般工业技术—材料科学与工程]