Co对铸造镍基高温合金影响研究进展

Research Progress in Effects of Cobalt on Cast Nickel-based Alloys

镍基高温合金拥有优异的热强性和服役稳定性,是使用最广泛的高温合金之一。镍基合金发展初期便加入Co元素来改善合金性能,但目前Co在镍基合金中的作用仍存在争议。通过汇总分析Co对镍基高温合金显微组织、γ′相析出特征、组织稳定性及力学性能的影响,从直接作用和间接作用两个角度对Co作用机制进行了探讨,并讨论节Co和代Co的可能性,以期为新型镍基高温合金的研发以及含钴镍基高温合金的应用提供参考。

Nickel-based alloys possess excellent thermal strength and service stability,which are the widely used for high temperature applications.Cobalt was initially added in the development of nickel-based alloys to improve alloy properties.However,the role of Co in nickel-based alloys is still controversial.Effects of Co on microstructure,precipitation characteristics of the γ′phase,stability and mechanical properties of nickel-based alloys were investigated,and Co action mechanism was analyzed from the aspects of effects and indirect effects.Moreover,the possibility of saving Co and replacing Co was explored,aimng to provide theoretical basis for the development of novel nickel-based alloys and application of nickel-based alloy containing Co.