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对离心喷射沉积IN718合金进行固溶处理及870℃×(10～100)h时效。利用EPMA背散射电子像及TEM衍衬像显示其显微组织形貌,利用电子探针-能谱分析(EPMA-EDS)和复相分离法(MPSM)测算了合金中的γ″、δ和基体相的成分,计算了各相含量以及相间典型元素分配量,分析了各元素在γ″和δ相的分布特征。结果表明,离心喷射沉积IN718合金在870℃时效后析出γ″和δ相;随着时效时间的延长,δ相含量符合Avram i公式规律;时效30 h后γ″相含量随时间呈线性增加;元素分配量的变化揭示了时效过程中相间元素的分布特征。
Centrifugal spray deposited IN718 alloy solution treatment and 870 ℃ × (10 ~ 100) h aging. The microstructure of the alloy was characterized by EPMA backscattering electron and TEM. The electron emission spectra of the alloy were characterized by EPMA-EDS and MPSM. Based on the composition of matrix phase, the content of each phase and the distribution of typical elements between phases were calculated. The distribution characteristics of each element in γ “and δ phases were analyzed. The results showed that γ ”and δ phases were precipitated after centrifugal aging at 870 ℃ for IN718 alloy. With the aging time increasing, the content of δ phase accorded with Avram i formula. The content of γ" phase increased linearly with time after aging for 30 h. The variation of elemental distribution reveals the distribution characteristics of interphase elements in the aging process.