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本文比较系统地研究了钴对Fe-Cr-Ni-Co基Refractoloy26合金组织结构的影响。实验采用光学显微镜,电子显微镜,X射线衍射分析及化学相分析等方法对不同含钴量合金的显微组织进行了观察和分析。结果表明:减少Refractoloy26合金中的含钴量将使γ析出相的重量百分数和γ′相颗粒尺寸增加,而使γ-γ′相之间的点阵错配度减小;使合金中析出的MC碳化物稳定性降低,从而使合金在时效过程中形成较多的M23C6和M6C碳化物,并使析出的各类碳化物总量增加,在高钴合金中,M23C6碳化物不再存在,但有μ相析出。另外,定量金相分析结果证明合金含钴量对孪晶形成的数量和形貌也均有影响。
This paper systematically studied the cobalt on Fe-Cr-Ni-Co-based Refractoloy26 alloy structure. The microstructure of the alloy with different cobalt content was observed and analyzed by optical microscope, electron microscope, X-ray diffraction analysis and chemical phase analysis. The results show that reducing the amount of cobalt in Refractoloy26 alloy will increase the weight fraction of γ precipitates and the particle size of γ ’phase, and reduce the mismatch of lattice between γ-γ’ phases. MC carbides reduce the stability, so that the alloy in the aging process to form more M23C6 and M6C carbides, and to precipitate the total amount of various types of carbides increased in high-cobalt alloys, M23C6 carbide no longer exists, but There μ phase precipitation. In addition, the results of quantitative metallographic analysis show that the amount of cobalt contained in the alloy also affects the number and morphology of twin formation.