采用光学显微镜、扫描电子显微镜和透射电子显微镜等研究固溶温度和时效时间对Inconel 617高温合金微观组织与力学性能的影响。结果表明：Inconel 617合金固溶态组织中主要析出相为M ₂₃C₆型碳化物，且优先于晶界处形核长大；随着固溶温度的升高，晶界及晶内碳化物经历先长大后溶解两个过程，合金平均晶粒尺寸生长速率提高。随着时效时间的延长，γ′相弥散析出且均匀分布于组织中，呈现数量减少、尺寸增大的趋势。γ′相尺寸增大，其晶格错配度随之增大，γ′相周围的弹性应变场增强，强化效果更加明显。高温拉伸性能测试表明：随固溶温度的升高，Inconel 617合金在750 ℃时抗拉强度和屈服强度逐渐降低，而在900 ℃时抗拉强度和屈服强度逐渐提高。在≤750 ℃时Inconel 617合金晶界强度高于晶内强度，而在900 ℃时晶内强度则高于晶界强度。随时效时间的延长，Inconel 617合金在750 ℃时抗拉强度和屈服强度逐渐提高。

The effects of solid solution temperature and aging time on the microstructure and mechanical properties of Inconel 617 superalloy are studied by using optical microscope， scanning electron microscope， and transmission electron microscope. The results show that the main precipitated phase in the solid solution microstructure of Inconel 617 superalloy is M ₂₃C₆ type carbide， and the nucleation growth is preferentially at the grain boundary. With the increase of solid solution temperature， the grain boundaries and intragranular carbides undergo two processes： first growing and then dissolving， and the average growth rate of the grain size also increases. As the aging time prolongs， the γ′ phase precipitates dispersedly and distributes uniformly in the microstructure，showing a trend of grain quantity decrease and grain size increase. As the size of the γ′ phase increases， its lattice mismatch also increases， and the elastic strain field around the γ′ phase is enhanced， resulting in a more obvious strengthening effect. High- temperature tensile properties testing shows that the tensile strength and yield strength of Inconel 617 alloy gradually decrease at 750 ℃ with the increase of solid solution temperature， while they gradually increase at 900 ℃. The grain boundary strength of Inconel 617 alloy is higher than the inner grain strength at ≤750 ℃， while the inner grain strength is higher than the grain boundary strength at 900 ℃. The tensile strength and yield strength of Inconel 617 alloy at 750 ℃ increase gradually with the aging time.