一、前言 随着航空发动机和燃汽轮机的发展,要求高温部件的使用寿命越来越长。相继发展了各种类型的Fe、Ni和Co基高温合金。涡轮一级导向叶片要求耐热腐蚀、耐热疲劳以及在高温应力的作用下,具有高的强度、塑性和良好的组织稳定性。在这些方面,钴基合金优于镍基合金。难变形高碳Co60 I. Introduction With the development of aero-engines and gas turbines, the service life of high-temperature components is required to be longer and longer. Various types of Fe, Ni and Co-based superalloys have been developed. Turbine first-level guide vanes require hot corrosion, thermal fatigue and high temperature stress, high strength, plasticity and good tissue stability. In these areas, cobalt-based alloys are superior to nickel-based alloys. Difficult to change high-carbon Co60