Creep-fatigue rupture mechanism and microstructure evolution around film-cooling holes in nickel-based DS superalloy specimen

被引：19
|
作者：
Zhao, Ting [1 ]
Hu, Xiaoan [1 ,2 ]
Jiang, Yun [2 ,3 ]
Teng, Xuefeng [1 ]
Liu, Fencheng [1 ]
Li, Bin [4 ]
Zhang, Shengliang [5 ]
Sun, Yantao [5 ]
机构：
[1] Nanchang Hangkong Univ, Sch Aircraft Engn, Nanchang 330063, Jiangxi, Peoples R China
[2] Nanchang Hangkong Univ, Jiangxi Key Lab Micro Aeroengine, Nanchang 330063, Jiangxi, Peoples R China
[3] Nanchang Hangkong Univ, Anal & Testing Ctr, Nanchang 330063, Jiangxi, Peoples R China
[4] China PLA Air Force, Equipment Dept, Beijing, Peoples R China
[5] Beijing Aeronaut Technol Res Ctr BATRC, Beijing, Peoples R China
来源：
INTERMETALLICS | 2021年 / 139卷
关键词：
Nickel-based superalloy; Creep-fatigue; Film-cooling hole; Fracture analyzation; Damage evolution; SINGLE-CRYSTAL SUPERALLOY; LIFE PREDICTION; BEHAVIOR; DAMAGE; DEFORMATION; FAILURE; STATE;
D O I：
10.1016/j.intermet.2021.107359
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this paper, creep-fatigue behaviors of the thin-walled tubular specimen with film holes were experimentally studied to address the influence of cyclic stress interruptions on creep strength and creep-fatigue life of a directionally solidified superalloy. The specimens with and without multiple holes were designed and manufactured to consider the effect of stress concentration produced by film cooling holes. The creep life of the specimen with holes has reduced significantly with the introduction of fatigue. An interesting result was found that the creep strength and life was enhanced on the stress concentrated specimens even if the creep loading was interruption by fatigue loadings, while creep fatigue life will be commonly shortened for notched specimen. Failure mechanisms related with cooling holes were analyzed on the basis of microscope observation.
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页数：9
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