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通过对一种含Re单晶镍基高温合金热处理期间及不同时效温度组织形貌的观察,结合有限元分析,研究合金中γ′相在热处理期间及蠕变期间的组织演化规律。结果表明,在固溶热处理期间,γ′相以蝶形组合从基体中析出;一次时效期间,γ′相长大为立方体形貌;二次时效期间,γ′相略有长大,排列更加规则。经不同温度的一次时效后γ′相尺寸逐渐长大,立方度增加。最后确定出该合金合理的热处理工艺。
Through the observation of the microstructure of a single-crystal nickel-base superalloy containing Re during the heat treatment and different aging temperatures, the microstructure evolution of the γ ’phase in the alloy during heat treatment and creep was investigated by combining the finite element analysis. The results show that during the solution heat treatment, the γ ’phase is precipitated from the matrix by a butterfly combination. During the first aging, the γ’ phase grows into a cube shape. During the secondary aging, the γ ’phase grows slightly and arranges more rule. After aging at different temperatures, the γ ’phase size gradually grows and the cubeness increases. Finally, the alloy to determine the reasonable heat treatment process.