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本文采用了金相显微镜、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”性复合介质腐蚀的、含 Ｃｒ．Ｎｉ，Ｍｏ的 Ｈａｓｔｅｌｌｏｙ Ｃ型 铸造镍基合金中析出相的形态，成分，结构及形成条件。着重研究了析出相的Ｃｒ含 量和敏化时间对合金耐蚀性的影响。研究结果表明，Ｈａｓｔｅｌｌｏｙ Ｃ型合金在 ８００— １２００℃范围内，有Ｐ相，μ相，Ｍ６Ｃ相及少量σ相析出，９００℃左右析出量相对 少些。这些析出相数量越多，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 corrosion resistance of Cr-containing composite materials. Morphology, composition, structure and formation conditions of precipitates in Ni, Mo Hastelloy C cast nickel-base alloys. The effects of Cr content and sensitization time on the corrosion resistance of the alloy were emphatically studied. The results show that Hastelloy C-type alloy precipitates P phase, μ phase, M6C phase and a small amount of σ phase in the temperature range of 800-1200 ℃, with less precipitation at 900 ℃. The more these precipitates, the more abundant Cr. Mo more serious. The poorer pitting resistance 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.