在600℃下进行了耐热钢GH36高低周复合疲劳裂纹扩展试验,观察到裂纹的da/dN明显地分为两个区域:其一是慢速扩展区,此时裂纹扩展主要取决于低循环载荷;其二是快速扩展区取决于高频振动。两区之间存在一个明显的过渡点,约为△K_(minor)=3.5～5MPa m~ (1/m)。而高频振动载荷抑制蠕变损伤。因此高温高、低周复合疲劳存在着低周-蠕变-高频振动三者的交互作用。 At 600 ℃, the heat-resistant steel GH36 high and low cycle composite fatigue crack growth test was carried out. It is observed that the da / dN of the crack is obviously divided into two regions: one is the slow expansion zone, and the crack propagation mainly depends on the low cycle Second, the rapid expansion depends on the high-frequency vibration. There is a clear transition point between the two districts, which is approximately ΔK-minor = 3.5 ~ 5MPa m ~ (1 / m). The high frequency vibration load suppresses creep damage. Therefore, high temperature, low cycle composite fatigue there is low week - creep - high-frequency vibration of the three interactions.