长期时效对FGH95镍基粉末高温合金γ'相及晶格常数的影响

Effect of long-term aging on γ' phase and lattice constant of FGH95 P/M Ni-based superalloy

摘要: 在不同温度下对FGH95镍基粉末高温合金进行长期时效处理，通过合金显微组织观察和X射线衍射分析，研究了长期时效对FGH95合金γ'相及晶格常数的影响。结果表明，完全热处理FGH95合金经450和550℃长期时效后，合金中细小γ'相略有长大，其粗化行为符合Lifshitz，Slyozov和Wagner（LWS）粗化动力学理论；随着时效时间的延长，FGH95合金中γ'相的晶格常数有所增加，而γ和γ'两相的晶格错配度减小；与时效时间相比，时效温度对FGH95合金中γ'相尺寸及晶格常数的影响更大。

Abstract: The effect of long-term aging on the γ' phase and lattice constant of FGH95 P/M Ni-based superalloy was investigated by microstructures observation and X-ray diffraction analysis. The results show that, after long-term aging at 450 and 550, th℃ e fine γ' phases in the full heat-treated FGH95 alloys are slightly grown up, in accordance with the coarsening kinetics in Lifshitz, Slyozov, and Wagner (LWS) theory. With the extension of aging time, the lattice constants of γ' phase in FGH95 alloys increase, while the lattice mismatches of the γ and γ' two phases decrease. Compared with the aging time, the aging temperature has a greater influence on the γ' phase size and lattice constant of the FGH95 alloy.