【摘要】 在本项研究工作中设计了用于“ＨＣｌ＋ＦｅＣｌ３”复合介质的铸造镍基合金的化学成分，用金相显微镜和扫描电子显微镜观察了合金的金相组织和断口形貌，研究了不同的热处理制度及改变含铬量和稀土加入量对合金性能的影响。试验结果表明，低的含铁量和较高的镍、铬、铂的复合作用，使该合金对氧化性和还原性介质均具有良好的耐蚀性和较高的抗点蚀性能。Ｃｒ１８Ｎ１６２Ｍｏ１６合金具有满意的铸造性能，经过１２５０±１０℃的固溶处理后，使合金具有良好的耐蚀性和较高的机械性能。试验中还发现，在这种镍基耐蚀合金中添加适量的稀土，可使合金的抗拉强度提高，塑性略有下降，对合金的耐蚀性和切削加工性能有所改善。更多还原

【Abstract】 In this research work, chemical compositions of nickel base cast alloys used for"HCl+FeC13"complex medium are designed. Metallographic microscope and SEM are applied in the experiments. The microstructure and fracture mode of alloy is observed. The different heat treatment process and the effects of different chromium content as well as different amounts of rare earth on the properties are studied. Experimental results show that the low-iron and the complex effect of the higher content of nickel, chromium and molybdenum, provide good corrosion resistance and higher pitting corrosion resistance in oxidizing and reducing environments. The Cr18Ni62Mo16 alloy possesses good casting behaviours after solution heat treatment on 1250±10℃, and thus allows the cast alloy to possess good corrosion resistance and higher mechanical properties. It has also been found that the addition of the proper amount of the rare earth in the nickel base alloys raises the tensile strength, corrosion resistance and machinability of the alloys, but lower the plasticity.更多还原