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经不同固溶时效处理的 ＰＭ Ｒｅｎｅ９５合金于 ６５０℃分别在蠕变、保载 ５和 ９０ ｓ疲劳载荷条件下进行了裂纹扩展速率实验．结果表明，相同热处理制度下，疲劳保载时间越长，裂纹扩展速率越高；相同载荷条件下，增加一次高温固溶并缓冷，有利于降低合金的裂纹扩展速率，且固溶温度越高裂纹扩展速率越低；１２００℃一次固溶缓冷并于１１６０℃二次固溶热处理比１１４０℃一次固溶的裂纹扩展速率约降低一个数量级；基体晶粒尺寸适当加大，强化相粒子γｃ数量增加、形状趋于田字形，有利于降低裂纹扩展速率.
The crack growth rate of PM Rene95 alloy treated by different solution-aging was tested under the fatigue loading of 5 and 90 s respectively at 650 ℃. The results show that under the same heat treatment regime, the longer the fatigue loading time, the higher the crack propagation rate. Under the same loading conditions, adding a high temperature solution and slow cooling is conducive to reducing the crack growth rate and the higher the solution temperature The crack growth rate is lower; the crack growth rate of the first solution and slow cooling solution at 1200 ℃ and the second solution treatment at 1160 ℃ is about one order of magnitude lower than that of the first solution solution at 1140 ℃; the grain size of the matrix is increased appropriately, Increasing, the shape tends to Tian shape, help to reduce the crack growth rate.