研究了GH738合金在固溶+稳定化+时效处理的多阶段热处理过程中组织演化规律和相应的室温硬度变化,构建了该合金组织演化的定性模型。结果表明,固溶温度高于γ’相回溶温度时,合金最终组织为连续晶界碳化物和尺寸均匀的γ’相;当固溶温度低于γ’相回溶温度时,在低稳定化温度下晶界碳化物成断续、颗粒状晶内存在大、小两种尺寸的γ’相。稳定化处理制度为850℃×100 min时,合金可以获得最大的室温硬度。 The microstructure evolution and corresponding room temperature hardness change of GH738 alloy in the multi-stage heat treatment process of solid solution + stabilization + aging were studied, and the qualitative model of the evolution of the alloy was established. The results show that when the solution temperature is higher than that of the γ ’phase, the final structure of the alloy is continuous grain boundary carbides and uniform γ’ phase. When the solution temperature is lower than the γ ’phase solution temperature, The temperature of the grain boundary carbide into intermittent, granular crystal exists in large and small size of the γ ’phase. The stability of the system is 850 ℃ × 100min, the alloy can get the maximum room temperature hardness.