Defect tolerance and hydrogen susceptibility of the fatigue limit of an additively manufactured Ni-based superalloy 718

•Fatigue strength properties of an additively-manufactured alloy 718.•Competition between defect size and grain size in determining the fatigue limit.•Successful evaluation of the defect tolerance as a small crack problem.•Experimental finding of the harmlessness of solute hydrogen on the fatigue li...

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Veröffentlicht in:International journal of fatigue 2020-10, Vol.139, p.105740-10, Article 105740
Hauptverfasser: Kevinsanny, Okazaki, Saburo, Takakuwa, Osamu, Ogawa, Yuhei, Funakoshi, Yusuke, Kawashima, Hideto, Matsuoka, Saburo, Matsunaga, Hisao
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container_end_page 10
container_issue
container_start_page 105740
container_title International journal of fatigue
container_volume 139
creator Kevinsanny
Okazaki, Saburo
Takakuwa, Osamu
Ogawa, Yuhei
Funakoshi, Yusuke
Kawashima, Hideto
Matsuoka, Saburo
Matsunaga, Hisao
description •Fatigue strength properties of an additively-manufactured alloy 718.•Competition between defect size and grain size in determining the fatigue limit.•Successful evaluation of the defect tolerance as a small crack problem.•Experimental finding of the harmlessness of solute hydrogen on the fatigue limit. The sensitivity of the fatigue limit of an additively manufactured, Ni-based superalloy 718 sample to surface finishing conditions and solute hydrogen was investigated via a series of tension–compression fatigue tests. The results revealed that neither defects nor hydrogen diminished the fatigue limit of the sample. The high defect tolerance of this material is attributed to a large unit of crack initiation in the coarse grain, which eclipses the detrimental effect of AM-process-induced defects. Also, from the results, it is inferred that hydrogen has little effect on the crack propagation rate and the crack growth threshold of the material.
doi_str_mv 10.1016/j.ijfatigue.2020.105740
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source ScienceDirect Journals (5 years ago - present)
subjects Additive manufacturing
Alloy 718
Compression tests
Crack initiation
Crack propagation
Crystal defects
Defects
Fatigue
Fatigue limit
Fatigue tests
Hydrogen
Hydrogen embrittlement
Materials fatigue
Nickel base alloys
Superalloys
Surface finishing
title Defect tolerance and hydrogen susceptibility of the fatigue limit of an additively manufactured Ni-based superalloy 718
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