研究了不同固溶处理工艺对CN617耐热合金组织和硬度的影响。结果表明,CN617合金在1125~1200℃温度范围内固溶处理时,晶粒正常长大,平均晶粒尺寸从31μm增长到206μm;超过1175℃固溶时,富铬和钼碳化物基本回溶。在1175℃固溶保温不同时间后,平均晶粒尺寸与硬度很好地符合Hall-Petch关系式。 The effect of different solution treatment on the microstructure and hardness of CN617 heat-resistant alloy was studied. The results show that the grains grow normally and the average grain size increases from 31μm to 206μm when the CN617 alloy is solution treated in the temperature range of 1125-1200 ℃. When the solid solution temperature exceeds 1175 ℃, the chromium and molybdenum carbide are basically dissolved . After 1175 ℃ solution heat preservation for different time, the average grain size and hardness fit well with the Hall-Petch relation.