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采用高分辨扫描电镜、物理化学相分析、X射线衍射等手段对实验GH80A合金热处理态的微观组织特征进行了定性和定量分析。结果表明,合金晶界分布有M7C3、M23C6两种碳化物,有效强化晶界,晶内弥散分布有γ’强化相,有效提高合金的高温强度;此外,采用Thermo-Calc热力学计算软件和Ni基数据库,对GH80A平衡析出相和非平衡凝固过程进行了模拟计算,并分析了合金元素Al、Ti对γ’相,C对MC、M7C3、M23C63种碳化物析出量和析出温度的影响。
High-resolution scanning electron microscopy, physical and chemical phase analysis, X-ray diffraction and other means of experimental GH80A alloy heat treatment of the microstructure characteristics were qualitative and quantitative analysis. The results show that M7C3 and M23C6 carbides are distributed in the grain boundaries of the alloy, which effectively strengthen the grain boundaries and improve the high temperature strength of the alloys. In addition, thermodynamic calculation software and Ni-based Database were used to simulate the equilibrium precipitates and non-equilibrium solidification processes of GH80A. The effect of Al and Ti on the precipitation and precipitation temperature of 63 MC, M7C3 and M23C carbides was also analyzed.