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本文使用Auger电子能谱研究了电渣重熔对一种Co基高温合金(Co-22Ni-22Cr-14W)在时效(760℃)过程中晶界附近化学成分的影响。结果表明,稀土La能固溶于合金,且主要偏聚于晶界附近。电渣重熔降低偏聚于晶界附近的La原子浓度,对P,S更明显。Cr原子在时效过程中不断向晶界附近偏聚,而钨原子则偏聚不严重。电渣重熔对Cr原子能减弱其偏聚程度,但对钨原子影响不明显。在时效开始阶段,电渣重熔阻碍碳原子向晶界附近偏聚,随着时间的延长,加速了碳原子的偏聚。
In this paper, Auger electron spectroscopy was used to study the effect of ESR on the chemical composition near the grain boundaries of a Co-based superalloy (Co-22Ni-22Cr-14W) during aging (760 ℃). The results show that rare earth La can dissolve in the alloy and mainly segregate near the grain boundary. Electroslag remelting to reduce segregation in the vicinity of the grain boundary La atom concentration, P, S more obvious. Cr atoms in the aging process continue to segregate near the grain boundaries, while the tungsten atoms segregation is not serious. Electroslag remelting on Cr atoms can weaken the degree of its segregation, but the impact of tungsten atoms is not obvious. In the initial stage of aging, ESR prevents the carbon atoms from being segregated near the grain boundaries, accelerating the segregation of carbon atoms with the passage of time.