合金元素在镍基粉末高温合金FGH97中强化作用的研究

Strengthening effect of alloying elements on FGH97 powder metallurgy superalloys

摘要:

运用高温合金强化机理，在FGH97合金标准成分的基础上，调整Co、Cr、Mo、W 4种合金化元素的含量，设计了3种合金。结果表明：调整合金元素后，FGH97合金中γ晶格常数获得提高，起到了固溶强化的效果，同时γ/γ′相错配度绝对值的提高增强了共格应变强化的效果；调整合金元素对显微组织、γ′相和碳化物等相的析出没有明显影响，没有增强晶界强化和沉淀强化的效果；固溶强化对强度增量的贡献值最高。

Abstract:

Based on typical FGH97 components, three P/M superalloys were designed by modifying five alloying elements. The results showed that the lattice parameters of γ phases were increased, which enhanced the effect of solid solution strengthening, increased absolute values of γ/γ′ misfit enhanced the effect of coherent strain strengthening. While the precipitation strengthening and grain boundary strengthening were ignorable. The largest contribution to the increment of tensile strength at room temperature was made by solid solution strengthening.