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。
The effect of the electroslag remelting (ESR) on the constitution nearby the grain boundary in a Co-base superalloy, Co-22Ni-22Cr-14W, during 760℃ aging has been investigated by Auger electron spectrum. Results show that the segregation of alloying elements toward the grain boundary is of various extents by the influence of ESR: the segregation of La may be decreased, and of P and S more markedly; That of Cr may also be decreased, but not obviously yet of W. At the beginning of aging, the segregation of C toward the vicinity of the grain boundary may be obstructed by ESR, and with the prolongation of aging time, it might be accelerated.
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