针对GH4169合金的Delta工艺,通过950℃高温拉伸实验研究了δ相对GH4169合金的高温拉伸变形行为的影响.结果表明:初始δ相含量为8.21％的GH4169合金的拉伸应力-应变曲线为典型的弹性-均匀塑性型；且在均匀塑性变形阶段表现为2个不同的变形阶段,其中第1阶段的加工硬化指数n为0.494,大于第2阶段的加工硬化指数0.101；其拉伸断裂机制为延性断裂的微孔聚集型断裂机制,其中δ相和碳化物是变形断裂中微孔形成的核心,因此δ相的存在使得合金的高温塑性降低,在GH4169合金的Delta工艺中必须控制δ相的析出含量.
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