对DP处理后的GH4169合金在变形温度900~1 060 ℃、应变速率0.001~0.500 s-1下进行了热压缩变形试验,研究了变形温度、应变速率和应变量对合金显微组织、δ相形貌以及δ相演变的影响,分析了组织演变机制.结果表明:DP处理后合金的显微组织中分布有大量片层状/长针状δ相,在高温压缩变形过程中变形断裂和溶解断裂的综合作用下,随应变量的增加,δ相发生弯曲、扭折直至球化;随着变形温度的升高或应变速率的降低,δ相含量逐渐减少,合金动态再结晶晶粒尺寸和动态再结晶体积分数逐渐增大.
The hot compressive deformation experiments were conducted on the delta-processed GH4169 alloy at the deformation temperatures of 900-1 060 ℃ and strain rates of 0.001-0.500 s-1.The effects of deformation temperature, strain rate and strain on the microstructure and the morphology and evolution of δ phase were studied and the evolution mechanism of microstructure was analyzed.The results show that a large number of plate-like or long-needle-like δ phase distributed in the microstructure of the delta-processed alloy.During the hot compressive deformation, with the increase of strain, the bending, kinking and spheroidization of the δ phase occured due to the combined effects of deformation and dissolution breakages.With the deformation temperature increasing or the strain rate decreasing, the content of δ phase decreased, while the grain size and the volume fraction of dynamic recrystallization increased.
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