Critical Plane Damage Method for Fatigue-creep Life Prediction of Nickel-based Superalloy

• Main Authors: DONG Chengli, YU Huichen
• Format: Article
• Language: zho
• Published: Journal of Aeronautical Materials 2017-08-01
• Series: Journal of Aeronautical Materials
• Subjects: critical plane damage (CPD); fatigue-creep; life prediction; directionally solidified; correlation coefficient
• Online Access: http://jam.biam.ac.cn/CN/Y2017/V37/I4/69

Adopting the classical critical plane damage method coupling fatigue-creep life models with adequate technique modification, the life predications of ZSGH4169 superalloy at 650℃and DZ125 superalloy at 980℃ were investigated to compare the predication accuracies of the five kinds of fatigue-creep life models, <i>i.e.</i> based on <i>W</i>_alls, <i>C</i>_cb, <i>S</i>_wt, <i>G</i>_lk and <i>F</i>_in. The results of typical examples show that the fatigue-creep model based on <i>W</i>_alls is the best for ZSGH4169 superalloy at 650℃,and the predicted life falls within &#177;3 scatter band of the test data, while the fatigue-creep model based on <i>G</i>_lk is the best for DZ125 superalloy at 980℃, and the predicted life falls within &#177;2.5 scatter band of the test data.