Fatigue Crack Growth in Flow Formed INCONEL 718

Fatigue Crack Growth in Flow Formed INCONEL 718

Fatigue crack propagation has been measured in flow formed Inconel 718 (IN718). Test pieces were extracted from a flow formed tubular structure in the longitudinal direction, retaining the tube curvature across their width. Crack growth rates (da/dN) were measured at 20, 300, and 400oC. For comparis...

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Veröffentlicht in:Materials Science Forum 2016-11, Vol.879, p.374-379
Hauptverfasser: Boettcher, Carl, Coleman, Costa, Bache, Martin R.
Format: Artikel
Sprache:eng
Schlagworte:
Crack propagation
Extractive metallurgy
Fatigue failure
Forges
Fracture mechanics
Mathematical analysis
Nickel base alloys
Superalloys
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Zusammenfassung:Fatigue crack propagation has been measured in flow formed Inconel 718 (IN718). Test pieces were extracted from a flow formed tubular structure in the longitudinal direction, retaining the tube curvature across their width. Crack growth rates (da/dN) were measured at 20, 300, and 400oC. For comparison, tests were repeated on specimens with an identical geometry but machined from conventionally forged IN718. Detailed metallurgy of the flow formed material is presented.
ISSN:0255-5476
1662-9752
1662-9752
DOI:10.4028/www.scientific.net/MSF.879.374