The dominant role of defects on fatigue behaviour of a SLM Ni-based superalloy at elevated temperature

被引：25
作者：
Wang, M. L. [1 ]
Yang, X. G. [1 ]
Li, B. [1 ]
Shi, D. Q. [1 ]
Miao, G. L. [2 ]
Guo, S. Q. [2 ]
Fan, Y. S. [3 ,4 ]
机构：
[1] Beihang Univ, Sch Energy & Power Engn, Beijing 102206, Peoples R China
[2] Chengdu Holy Grp Ind Co Ltd, Chengdu 610041, Sichuan, Peoples R China
[3] Beihang Univ, Res Inst Aeroengine, Beijing 102206, Peoples R China
[4] Beihang Univ, Natl Key Lab Sci & Technol Aeroengine Aerothermody, Beijing 102206, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 176卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Selective laser melting; Fatigue life scatter; Additive manufacturing defects; Critical defect characterization; Ni-based superalloy; LOW-CYCLE FATIGUE; X-RAY MICROTOMOGRAPHY; MECHANICAL-PROPERTIES; SURFACE-ROUGHNESS; VOID GROWTH; STRENGTH PREDICTION; SCANNING STRATEGY; CRACK INITIATION; LIFE PREDICTION; LASER;
D O I：
10.1016/j.ijfatigue.2023.107894
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
This research investigates the impact of defects on the fatigue properties of a selective laser melted Ni-based superalloy at elevated temperatures. Results show that 78.6% of the fatigue failures are initiated by defects, with a larger scatter in fatigue life at lower stress levels. And the coalescence and growth of defects are captured by X-ray computed tomography (XCT). Besides, a quantitative analysis indicates that the fatigue life increases with defect location but decreases with defect size, which is influenced by defect shape. A modified stress intensity range, & UDelta;KL, is proposed, considering the effect of the three factors. Statistical characterization shows larger extreme values for critical defects compared to XCT observation.
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页数：18
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