利用OM,SEM和裂纹扩展速率测试等手段分析了GH4740H,GH4738,GH3625和690合金不同均匀化程度下的组织特征以及这些组织状态的热变形行为,系统研究了合金均匀化工艺因素与再结晶的关联规律.研究结果表明,合金均匀化需要兼顾枝晶偏析消除带来的热塑性改善以及晶粒长大和氧化加剧所导致的后续热变形时的塑性下降;合金未完全均匀化留下的残留枝晶间区域提供了再结晶形核位置,提高再结晶形核率.在相同热变形条件下,有残留枝晶组织的试样再结晶程度明显高于完全均匀化、无枝晶组织的试样.为此提出基于部分均匀化制度的高温合金均匀化开坯控制方法具有合理性. The microstructures and heat deformation behaviors of GH4740H, GH4738, GH3625 and 690 alloy under different homogenization degree were analyzed by means of OM, SEM and crack growth rate test. The effects of the alloy homogenization process factors and recrystallization The results show that the homogenization of the alloy requires both the improvement of the thermoplastic properties due to the elimination of dendritic segregation and the plastic reduction during the subsequent thermal deformation caused by the grain growth and oxidation. The residual dendrites left by incomplete alloy homogenization The intergranular region provides the nucleation sites for recrystallization and improves the nucleation rate of recrystallization.The recrystallization degree of the specimens with residual dendrites is significantly higher than that of the specimens with completely uniform and dendritic structure under the same thermal deformation conditions. Therefore, it is reasonable to propose a control method of homogenizing the superalloy based on partial homogenization.