用晶体热粘塑性模型研究了镍基合金中γ与γ＇相的非弹性行为,进行了在晶体塑性理论基础上考虑镍基高温合金中的随机分布相结构对其蠕变与损伤过程的数值模拟. 模拟假定合金中γ＇相的尺寸及分布具有随机性,γ与γ＇相在高温下的变形、损伤用温度相关的晶体粘塑性损伤本构关系进行计算, 计算结果与周期体胞模型进行了比较. 结果表明: γ＇相随机分布模型能够反映镍基合金微观变形和应力分布不均匀、局部剪切变形和可能的破坏倾向; 该模型的蠕变分析结果较周期体胞模型合理.
The microscopic creep and damage evolution under elevated-temperature tension was simulated using crystalline thermo viscoplastic constitutive description for the γ-matrix and γ'-precipitates respectively. In the present paper, the following contents were introduced: (1) a Representative Volume Element(RVE) of Voronoi aggregate with randomly spatial arrangement of γ-γ' phases; (2) a single crystalline thermo viscoplastic constitutive relation associated with micro-void damage description and corresponding iterative algorithm; (3) damage evolution of γ-γ' superalloy at micro scale under elevated temperature; (4) comparative analysis of describing ability between two type of RVEs of Voronoi γ-γ' aggregate and roughly-periodic γ-γ' unit cell.
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