Damage evolution and life modeling of hot corrosion environment on creep‐fatigue of a directionally solidified nickel‐based superalloy
Jianhui Hu, Gaole Zhao, Shaolin Li, Hongyu Qi, Xiaoguang Yang, Duoqi Shi
Abstract
Abstract This study developed a corrosion‐creep fatigue‐life‐prediction methodology based on continuous‐damage mechanics (CDM). A systematic investigation of the turbine‐blade material DZ125 (a nickel‐based superalloy) was conducted, including oxidation and high‐temperature hot corrosion‐creep fatigue tests. Pre‐exposure experiments explained the damage process in DZ125. The applicability of the CDM‐based life‐prediction model of DZ125 was verified experimentally and by comparison with corresponding data from published studies. The model exhibited excellent life‐prediction ability for gas‐turbine hot‐section components vulnerable to cyclic loads and hot corrosion combined.