采用Gleeble-1500热模拟机对GH738镍基高温合金进行高温热压缩变形实验,分析该合金在变形温度1000～1160℃、应变速率0.01～10 s-1、工程变形量15％～70％条件下流变应力的变化规律.确定GH738合金热变形方程,建立热加工图(Processing map),并通过组织观察对热加工图进行解释.GH738合金热变形激活能Q为499 kJ/mol;热加工图随不同变形量而变化,在应变速率较低,温度较高的状态下,能量耗散效率较高.综合应变量为0.2,0.4,0.6和0.8应变量下的热加工图,确立了该合金最佳热加工“安全通道”,为GH738高温合金热加工工艺优化提供理论依据.
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