镍基高温合金定向粗化行为的有限元分析  

Finite Element Analysis of Directional Coarsening in Ni-based Superalloy

作　　者：杨永清[1] 周丽[1] 张嘉易[1] 

机构地区：[1]沈阳理工大学机械工程学院,辽宁沈阳110168

出　　处：《沈阳理工大学学报》2009年第3期42-45,49,共5页Journal of Shenyang Ligong University

摘　　要：镍基高温合金广泛应用于燃气轮机的叶片、涡轮盘和燃烧室等高温部件.针对镍基单晶高温合金的服役条件和结构特点,采用有限元方法建立数学模型,有限元分析时用热膨胀系数代替正负错配的选择,用柔度矩阵的计算表达单元各向异性,并计算静水压力(hydrostaticpressure)及等效应力(von Mises stress)分布,研究负错配的情况下镍基高温合金在[111]取向上受载时γ′颗粒的定向粗化行为,结果表明γ′颗粒的粗化方向及形态依赖于应力轴取向.The nickel base heat-resisting alloy is widely used in high temperature parts, on the gas turbine blade, turbine disk and combustion chamber. According to the service conditions and structural characteristic of nickel base single crystal superalloy, the finite element method is used for establishment of mathematical model. Using the finite element analysis, the thermal-expansion coefficient is used for replacing the positive and negative wrong matches, and the unit aeolotropy is expressed with the flexibility matrix computation. And the hydrostatic pressure and von Mises＇ stress distributed rule are calculated, the directional[ 111 ] coarsening behavior of γ＇ precipitates is studied. The coarsening direction and final morphology vary with stess axis orientatin.

关 键 词：镍基单晶高温合金 定向粗化 点阵错配 

分 类 号：TK412[动力工程及工程热物理—动力机械及工程]