【摘要】 从连续损伤理论出发,对蠕变损伤Dc与弹性模量E的关系进行了数学描述,回归了GH33A合金的蠕变损伤发展规律。根据蠕变理论,分析了蠕变损伤的微观特征指出蠕变损伤的微观形态主要表现为晶界空洞型微裂纹,晶界碳化物对蠕变损伤的形成具有重要作用。并进一步探讨了蠕变损伤对蠕变-疲劳交互作用裂纹扩展的贡献。更多还原

【Abstract】 In this paper, creep damage and its effect on creep fatigue interaction crack propegation are investigated. From the continuous damage theory, mathematics relation of creep damage Dc and the modulus of elasticity E is established. And the development rule of creep damage to alloy GH33A is showed. After being analysised the microcharacters of creep damage, it shows that microshape of creep damage appears as grain boundary cavities, and carbides in the grain boundary areimportant to formation of creep damage. The effect of creep damage acculates the creep-fatigue interaction crack propegation rate.更多还原