Strain rate and oxidation effects on crack initiation at 600 and 650 °C in a nickel-based superalloy. (3rd May 2016)

• Record Type: Journal Article
• Authors: Perrais, M.; Seror, A.; Burteau, A.; Andrieu, E.; Poquillon, D.
• Is Part Of: Materials at high temperatures. Volume 33:Number 3(2016)
• Page Start: 241
• Page End: 247
• Publication Date: 2016-05-03
• Subjects: Ni-based superalloys -- Direct aged alloy 718 -- Oxidation -- Environment assisted cracking; Materials at high temperatures -- Periodicals; High temperatures -- Periodicals; 620.1121705
• DOI: 10.1080/09603409.2016.1169665
• Languages: English
• ISSNs: 0960-3409

Abstract

Abstract : Nickel-based superalloys are sensitive to an oxidation-assisted intergranular crack (OAIC) growth mechanism. Crack initiation during slow strain rate tensile tests is investigated at 600 and 650 °C, at different strain rates, with or without oxidation on a direct-aged material. A V-shaped sample geometry is used to promote damage initiation for a specific stress triaxiality. The critical mechanical loading paths inducing intergranular crack initiation as well as the effect of oxidation are discussed.