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Effect of Service-Induced Degradation on Residual Stress Rupture Life of a Directionally Solidified Superalloy
Guo, Xiaotong1,2; Xing, Weijie3; Zhang, Heng2; Li, Yong1,2; Peng, Hemeng1,4; Yang, Chuan1
2022-02-01
摘要The influence of service-induced degradation on residual life is very important for the safe service of turbine blades. In this study, a series of simulation experiments were conducted on a directionally solidified superalloy under (880-1020) & DEG;C/(70-220) MPa and interrupted after 500 h. Then, the stress rupture life of the interrupted specimens was tested under 980 & DEG;C/275 MPa. The results showed that the increase of simulated experiment temperature decreased the residual stress rupture life. In brief, the simulation experiments at 880 & DEG;C did not influence the residual stress rupture life of the alloy. The simulated experiments at 980 & DEG;C and 1050 & DEG;C mainly affected the microstructure of gamma' phase, while not gamma/gamma' eutectic and carbides. After the stress rupture tests under 980 & DEG;C/275 MPa, cracks were located at the interfaces between carbides and gamma matrix in the interdendritic regions. This study provides guidance on the degradation evaluation and safety service of the directionally solidified superalloys.
关键词directionally solidified superalloy service induced degradation stress rupture property microstructure gamma' phase
DOI10.3390/cryst12020267
发表期刊CRYSTALS
卷号12期号:2页码:7
通讯作者Yang, Chuan(xingweijie@biam.com)
收录类别SCI
WOS记录号WOS:000770428400001
语种英语