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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。
The evolution of γ ’phase in [011] oriented nickel-base single crystal superalloy during 980 ℃ and 200MPa tensile creep tests was studied. The distributions of Von Mises stress and elastic strain energy density in the γ and γ ’phases of a single crystal alloy with and without external load were calculated using finite element method. The results show that the Von Mises stress of the substrate roof at a 45 ° angle to the stress axis is much higher than that of the Von Mises stress in the gable parallel to the stress axis when tensile stress is applied in the [011] orientation. The difference of the strain energy density drives the formation of γ ’phase to diffuse from the deformed channel to the deformed channel, while the elements of γ phase diffuse backwards, resulting in the growth of γ’ phase along [010] and [100] A lamellar raft structure perpendicular to the [001] direction and inclined at an angle of 45 ° to the stress axis was formed.