考虑微观组织演化的 DD6 单晶高温合金蠕变剩余寿命预测

DD6 single crystal superalloy was taken as the research object to analyse the hardening mechanism of material dislocation movement by describing the microstructure evolution phenomenon,and a multi-scale creep constitutive model considering microstructure evolution was established; then a creep residual life prediction method considering the creep damage by characterizing the creep damage state was proposed. The experimental results showed that the creep model improved the simulation accuracy by 57.6% compared with the θ projection method,and the model parameters were reduced by 1/3 compared with the K-R damage model. The average prediction error of the creep residual life model prediction results was only 5.59%,indicating the validity of the model.