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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。
Based on the theory of continuous damage, the relationship between creep damage Dc and elastic modulus E is described mathematically, and the rule of creep damage development of GH33A alloy is regressed. According to the creep theory, the micro-characteristics of creep damage are analyzed. It is pointed out that the micro-morphology of creep damage is mainly characterized by grain boundary cavity micro-cracks and grain boundary carbides play an important role in the formation of creep damage. The contribution of creep damage to creep-fatigue interaction crack propagation is further discussed.