期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 136, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105580
关键词
Additive manufacturing; Selective laser melting; Very high cycle fatigue; Fatigue crack initiation; Fatigue sensitivity level
资金
- National Natural Science Foundation of China [11832007, 11572057, 11772209, 11602038]
- JSPS Postdoctoral Fellowship for Overseas Researchers [P19730]
Ultrasonic fatigue tests were performed to investigate high and very high cycle fatigue behaviors of a laser additively manufactured Inconel 718 (IN718) alloy in the as-deposited condition. The results indicate that the competition failure behavior between the surface and interior crack initiation results in the separate S-N curve. Both manufacturing defects (e.g., gas pore, lack of fusion) and columnar grains (matrix) observed in the microstructure could act as the original fatigue micro-cracks due to the effective restriction on manufacturing defects. The fatigue sensitivity levels increase successively in terms of the type, size, and location of the maximal micro-crack.
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