镍基单晶合金[011]取向γ′相筏形化的有限元分析

Single Crystal Nickel-based Superalloy [011] Direction γ′-Phase-shaped Craft-oriented Finite Element Analysis

研究1 040℃、137 MPa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.采用三维有限元方法计算单晶合金在有/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,(001)晶面的von Mises应力远大于(001)晶面的Von Mises应力,3个晶面的应变能密度差异驱动γ′相形成元素从变形较大的(001)晶面向变形较小的(010)和(100)晶面扩散,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.

The tensile creep [011]-oriented nickel-base single crystal superalloys/the evolution of two-phase approach was studied during the period imposed 137 MPa and 1 040 ℃.ANSYS finite element method was used to analyze the single crystal alloy with γ/γ′ without external load and the Von Mises stress in the and γ′ two phase distribution.During the study the tensile creep [011]-oriented nickel-base single crystal superalloys cubic γ/γ′ two-phase interface of the von Mises stress distribution,the lattice strain and the strain energy variation were predicted by the tensile creep [011]-oriented single-crystal alloy phase directional coarsening law.The results were shown that：the corresponding cubic γ′ formed the raft-like organizations along the von Mises stress and strain energy density of the crystal face in the creep period.