由于GH4065A合金的强化相γ'相的体积分数为43.0％,显微组织演化规律不同于传统的变形高温合金与粉末高温合金.系统分析了GH4065A合金的锻态组织特点与演化机制,发现其显微组织是一种不完全的动态再结晶(DRX)组织,动态再结晶晶粒被大尺寸γ '相限制长大,同时这些γ'相因晶界短路扩散而粗化,而未动态再结晶(unDRX)晶粒内弥散分布的小尺寸γ'相阻碍位错运动,进而形成大量由位错胞壁构成的亚结构.基于合金的锻态组织特点,可以通过固溶处理,利用动态回复(DRV)机制基本消除残留的未动态再结晶组织.根据GH4065A合金γ'相的固溶温度,可将热处理制度分为亚固溶处理与过固溶处理2种,亚固溶处理后的晶粒度为8.0级,过固溶处理的晶粒度为4.0级.经亚固溶处理后,GH4065A合金涡轮盘锻件的力学性能达到了第2代粉末涡轮盘的水平.
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