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利用金相显微镜、透射电镜和扫描电镜对 GH36合金经蠕变-疲劳交互作用后的组织进行综合分析。结果表明,经蠕变-疲劳交互作用后合金晶界上出现大量的微裂纹,其位错结构不同于蠕变的胞状结构和疲劳的条带缠结,而形成复杂组态。分析讨论了晶界碳化物 M_(23)C_6 对形成疲劳损伤和蠕变损伤的作用及其对蠕变-疲劳交互作用裂纹扩展的影响。
The microstructure of GH36 alloy after creep-fatigue interaction was comprehensively analyzed by optical microscope, transmission electron microscope and scanning electron microscope. The results show that a large number of micro-cracks appear on the grain boundary of the alloy after creep-fatigue interaction, and the dislocation structure is different from the creep cell structure and the fatigue banding, resulting in complex configuration. The effect of M_ (23) C_6, a grain boundary carbide, on the formation of fatigue damage and creep damage and its effect on creep-fatigue interaction crack propagation were analyzed.