Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 140, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105802
Keywords
Additive manufacturing; Inconel 718; Fatigue crack propagation; High temperature; Laser powder bed fusion
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2018R1A5A6075959]
- Industrial Technology Innovation Program - Ministry of Trade, industry & Energy (MOTIE, Korea) [10067503]
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MOTIE, Korea) [20002700]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10067503, 20002700] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The fatigue crack propagation (FCP) behavior of Inconel 718 alloy manufactured by laser powder bed fusion (L-PBF) was studied at 25 and 650 degrees C, and compared to those of conventionally processed counterpart. The FCP rates of L-PBF Inconel 718 alloy were found to be significantly higher than those of conventionally processed counterpart at 25 degrees C in low and intermediate Delta K regimes. The FCP rates decreased in near-threshold Delta K regime at 650 degrees C, while the reversal occurred above Delta K of 7 MPa root m, as compared to those at 25 degrees C. The FCP behavior of L-PBF Inconel 718 alloy was discussed based on micrographic and fractographic analyses.
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