论文部分内容阅读
本文研究了15Cr-25Ni和15Cr-40Ni型铁基高温合金中μ和σ相引起的晶界脆化。在铁基高温合金中当晶界存在少量的μ和σ相时(甚至其含量在0.01—1%间),就会引起合金脆化,其脆化程度与晶界存在的μ和σ相的密集系数成正比关系。冲击试验时的脆化导致沿晶断裂,μ和σ相所引起的断裂机构是完全不同的。减小晶粒尺寸或控制合金化学成分使晶界上的μ和σ相减少或根本不生成,则可以控制或消除合金的脆化效应。
In this paper, grain boundary embrittlement caused by μ and σ phases in 15Cr-25Ni and 15Cr-40Ni iron-based superalloys was studied. In the iron-based superalloy, a small amount of μ and σ phases exist in the grain boundary (even between 0.01 and 1%), causing the alloy to embrittle to the extent that the degree of embrittlement is related to the μ and σ phases existing at the grain boundaries Dense coefficient is proportional to the relationship. Brittleness during impact test results in intergranular fracture, and fracture mechanisms caused by μ and σ phases are quite different. Reducing the grain size or controlling the chemical composition of the alloy reduces or eliminates the μ and σ phases at the grain boundaries, then the embrittlement effect of the alloy can be controlled or eliminated.