文献类型：期刊文献

英文题名：Creep-fatigue life prediction of notched structure after an advanced surface strengthening treatment in a nickel-based superalloy at 650°C

作者：Li, Kai-Shang[1];Yao, Shu-Lei[1];Cheng, Lv-Yi[1];Wang, Run-Zi[2,3];Sun, Li[1];Gu, Hang-Hang[1];Wang, Ji[1];Lu, Ti-Wen[1];Zhang, Cheng-Cheng[4];Zhang, Xian-Cheng[1,5];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Meilong Rd 130, Shanghai 200237, Peoples R China;[2]Adv Inst Mat Res WPI AIMR, Sendai 9808577, Japan;[3]Tohoku Univ, Grad Sch Engn, Dept Mat Proc, Sendai 9808579, Japan;[4]AVIC Commercial Aircraft Engine Co LTD, Shanghai Engn Res Ctr Commercial Aircraft Engine, Shanghai 201108, Peoples R China;[5]East China Univ Sci & Technol, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2024

卷号：173

外文期刊名：INTERNATIONAL JOURNAL OF PLASTICITY

收录：;EI(收录号：20240215355845);WOS:【SCI-EXPANDED(收录号:WOS:001155912400001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 52005185, 52305152 and U21B2077) , China Postdoctoral Science Foundation (Grant No. 2023M731078) , China National Postdoctoral Program for Innovative Talents (Grant No. BX20230120) , and the National Key Research and Development Project (Grant No. 2018YFA0703300) .

语种：英文

外文关键词：Creep-fatigue life prediction; Surface strengthening; Dual-scale modeling; Life improvement mechanism

摘要：The elucidation of creep-fatigue damage mechanisms is still controversial for high-temperature structures after surface strengthening treatments, which serves as a critical foundation for the development of an accurate life prediction method. In this work, a numerical procedure is constructed for the prediction of creep-fatigue life improvement, where a dual-scale modeling approach is proposed to integrate important strengthening factors and microstructure features. The macro-scale finite element (FE) simulation aims to investigate the cyclic deformation behavior in a notched structure by using a viscoplastic constitutive model. The initial stress field is predetermined based on the experimental residual stress. The micro-scale FE analysis is employed to investigate the local damage evolution occurring at the notched root by combining size-dependent crystal plasticity with grain boundary cavity model. The cycle-by-cycle deformation histories are extracted from the macro-scale FE model and subsequently are utilized as boundary conditions in the micro-scale FE one. From the experimental perspective, the submerged micro-abrasive waterjet peening (SMA-WJP) process is carried out for creep-fatigue life improvement of the notched structure. Results shows that the notched structure treated by the SMA-WJP process forms an obvious plastic layer with the depth of 20 mu m and residual stress with the maximum value of -926 MPa. The predicted numbers of cycles to crack initiation agree with the creep-fatigue experimental ones before and after SMA-WJP. In detail, the surface residual stress and plastic layer are unable to suppress the cavity nucleation on the grain boundaries of internal material. As a consequence, the creep-fatigue life improvement is diminished as the hold time increases, which can be accurately predicted by the developed numerical procedure.