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本文采用金相显微镜,透射电镜、化学相分析、金属薄膜以及力学性能测试等方法鉴定了GH128合金的析出相。研究了μ相的析出规律、(?)_v值和应力与相析出速度的关系,以及析出相对力学性能的影响。结果表明,GH128合金时效后析出μ、M_6C、a_W和M_(23)C_6。它们与基体的取向关系是:(111)_γ//(001)_μ;(001)_γ//(001)_(M_6C),(110)_γ//(110)_(M6C);(100)_γ//(100)_(M23C6),(001)_γ//(001)_(M23C6)。μ相析出呈C曲线。析出温度范围是700～1050℃,析出峰为850～950℃。随(?)_v值增加,C曲线向时效时间短的方向移动,但不影响析出峰,应力加速μ相析出。合金持久性能的下降和时效后室温塑性降低,主要是μ相析出所致,但μ相对高温拉伸性能影响很小。
In this paper, metallographic microscope, transmission electron microscopy, chemical phase analysis, metal films and mechanical properties of the test methods identified GH128 alloy precipitation phase. The relationship between the precipitation law of μ phase, the value of (v) and the stress and phase precipitation rate, and the influence of the relative mechanical properties of precipitation were studied. The results showed that μ, M_6C, a_W and M_ (23) C_6 were precipitated after GH128 alloy was aged. (111) _γ // (001) _μ; (001) _γ // (001) _ (M_6C), (110) _γ // (110) _ (M6C); (100) _γ // (100) _ (M23C6), (001) _γ // (001) _ (M23C6). μ phase precipitation showed C curve. The precipitation temperature range is 700 to 1050 ° C, and the precipitation peak is 850 to 950 ° C. As the value of (?) _v increases, the C curve moves toward the short time, but it does not affect the precipitation peak and the stress accelerates the μ phase precipitation. The decrease of ductility and the plasticity of room temperature after aging are mainly caused by the precipitation of μ phase, but the influence of μ on the tensile properties at relatively high temperature is insignificant.