[011]取向镍基单晶合金高温蠕变期间γ′相定向粗化行为研究  

Phase Morphology Evolution of a Single Crystal Nickel-Base Superalloy in the [011] Direction During the Tensile Creep

作　　者：水丽[1,2,3] 金涛[2] 田素贵[3] 胡壮麒[2] 

机构地区：[1]沈阳理工大学,辽宁沈阳110168 [2]中国科学院金属研究所,辽宁沈阳110016 [3]沈阳工业大学,辽宁沈阳110023

出　　处：《稀有金属材料与工程》2009年第5期826-829,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50171045)

摘　　要：研究了980℃,200MPa拉伸蠕变期间[011]取向镍基单晶高温合金中γ′相的演化方式。采用有限元方法计算了单晶合金在有/无外加载荷时Von Mises应力及弹性应变能密度在γ和γ′两相中的分布。结果表明:沿[011]取向施加拉伸应力时,与应力轴呈45°角基体通道(roof)的VonMises应力远高于与应力轴平行的基体通道(gable)中的Von Mises应力,两通道中应变能密度的差异驱动γ′相形成元素从变形较大的通道向变形较小的通道扩散,而γ相形成元素反向扩散,导致γ′相沿[010]和[100]取向扩散生长,形成垂直于[001]方向且与应力轴倾斜成45°角的层片状筏形组织。By means of finite elements analysis, an investigation has been made for the directional coarsening manners and evolutional rule of γ＇ precipitates in a single crystal nickel-base superalloy with [011 ] orientation during tensile creep at 980℃ and 200 MPa. Results show that the von Mises stress in the matrix channel that is 45° with respect to the loading direction is larger than that in the matrix channel that is parallel to the loading direction when external loads applied along the [011] direction. The strain energy change in two kinds of matrix channel is the driving force for the γ＇ directional coarsening, the γ＇ phase developed along the [010] and [100] and perpendicular to the [001] orientations, and formed lamellar raft morphology inclined 45° angle to the tensile stress axis.

关 键 词：镍基单晶合金 有限元分析 组织演化 蠕变 

分 类 号：TG132.32[一般工业技术—材料科学与工程]