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Journal of Materials Engineering and Performance
Erschienen in: Journal of Materials Engineering and Performance 8/2014

01.08.2014

Fatigue Behavior of Inconel 718 TIG Welds

verfasst von: Nikolaos D. Alexopoulos, Nikolaos Argyriou, Vasillis Stergiou, Stavros K. Kourkoulis

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 8/2014

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Abstract

Mechanical behavior of reference and TIG-welded Inconel 718 specimens was examined in the present work. Tensile, constant amplitude fatigue, and fracture toughness tests were performed in ambient temperature for both, reference and welded specimens. Microstructure revealed the presence of coarse and fine-grained heat-affected zones. It has been shown that without any post-weld heat treatment, welded specimens maintained their tensile strength properties while their ductility decreased by more than 40%. It was found that the welded specimens had lower fatigue life and this decrease was a function of the applied fatigue maximum stress. A 30% fatigue life decrease was noticed in the high cycle fatigue regime for the welded specimens while this decrease exceeded 50% in the low cycle fatigue regime. Cyclic stress-strain curves showed that Inconel 718 experiences a short period of hardening followed by softening for all fatigue lives. Cyclic fatigue response of welded specimens’ exhibited cyclically stable behavior. Finally, a marginal decrease was noticed in the Mode I fracture toughness of the welded specimens.
Vorheriger Artikel On the Use of Infrared Thermography for Analysis of Fatigue Damage in Ti6Al4V-Welded Joints
Nächster Artikel Effect of Carbon Nanotube on High-Temperature Formability of AZ31 Magnesium Alloy

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Metadaten
Titel
Fatigue Behavior of Inconel 718 TIG Welds
verfasst von
Nikolaos D. Alexopoulos
Nikolaos Argyriou
Vasillis Stergiou
Stavros K. Kourkoulis
Publikationsdatum
01.08.2014
Verlag
Springer US
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 8/2014
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-014-1028-2

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