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基于镍基单晶合金蠕变过程中的细、微观组织结构变化及损伤特点，本文建立了考虑材质劣化和空洞损伤的双参数蠕变损伤本构方程及寿命预测模型。利用ＤＤ３单晶材料〈００１〉晶体取向的７６０，８５０和１０００℃实验结果考核表明，所建模型可以比较准确地预测蠕变第二、第三阶段变形状态及破坏特征。第二阶段持续时间、第三阶段开始时间可以表示成蠕变应力的指数函数；随着温度的升高，材料劣化加剧，空洞损伤也增加。
Based on the changes of microstructure and microstructure and the characteristics of damage during the creep process of Ni-based single crystal alloys, a two-parameter creep damage constitutive equation and life prediction model considering material deterioration and void damage were established. The experimental results of 760, 850 and 1000 ℃ using <001> crystal orientation of DD3 single crystalline material show that the model can predict the deformation state and failure characteristics of the second and third stages of creep relatively accurately. The duration of the second stage, the start time of the third stage can be expressed as an exponential function of creep stress; With the increase of temperature, material deterioration aggravate, hollow damage also increases.