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本文采用金相显微镜、Ｘ射线衍射、电子探针和透射电子显微镜相结合的方法，研究了耐“氧化－还原”，复合介质腐蚀的含Ｃｒ、Ｍｏ、ｗ的ＨａｓｔｅｌｌｏｙＣ型铸造镍基合金中析出相的形态、成分、结构及形成条件。着重研究了析出相含Ｃｒ量和敏化时间对合金腐蚀行为的影响。结果表明，ＨａｓｔｅｌｌｏｙＣ型合金在８００～１２００℃范围内有ｐ相、μ相、Ｍ＿６Ｃ相及少量σ相析出，９００℃左右析出量相对少些。析出相数量越多，富Ｃｒ、Ｍｏ越严重，则合金的耐点蚀和晶间腐蚀性能越差。敏化时间延长，亦使合金耐点蚀和晶间腐蚀性能有所下降，但对合金的均匀腐蚀程度影响不大。
In this paper, a combination of metallographic microscope, X-ray diffraction, electron probe and transmission electron microscopy was used to study the precipitation of HastelloyC cast Ni-base alloy containing Cr, Mo and W Phase morphology, composition, structure and formation conditions. The effects of Cr content in precipitated phase and sensitization time on the corrosion behavior of the alloy were investigated emphatically. The results show that there are p phase, μ phase, M_6C phase and a small amount of σ phase precipitated in the range of 800 ~ 1200 ℃. The precipitation amount of Hastelloy C is relatively less at 900 ℃. The more precipitated phases, the more rich Cr and Mo, the worse the pitting and intergranular corrosion resistance of the alloy. Prolonged sensitization also reduced the pitting and intergranular corrosion resistance of the alloy, but had little effect on the uniform corrosion of the alloy.