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 micro-change of material internal structure of nickel-base single crystal superalloy in the creep condition.a two-state-variable creep damage constitution considering simultaneously material-type damage and void-type damage has been built .Confirmed by the experiments of single crystal DD3 along<001> crystallographic orientation at 760, 850 and 1000℃,the model can predict precisely the steady creep , the tertiary creep and the rupture characteristics.The lasting time of the steady creep and the onset time of the tertiary creep are approximately power law function of creep stresses.As the test temperature increases,the material-type damage and void-type damage increase rapidly.YUE Zhufeng, postdoctor,Post Box No.350, Northwestern Polytechnical University, Xi＇an 710072
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