Effects of build direction and heat treatment on creep properties of Ni-base superalloy built up by additive manufacturing. (1st March 2017)

• Record Type: Journal Article
• Authors: Kuo, Yen-Ling; Horikawa, Shota; Kakehi, Koji
• Is Part Of: Scripta materialia. Volume 129(2017)
• Page Start: 74
• Page End: 78
• Publication Date: 2017-03-01
• Subjects: Superalloy -- Creep -- Intermetallic compounds -- Melting -- Additive manufacturing; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.10.035
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The effects of build direction and heat treatment on the creep properties of Ni-base superalloy fabricated by additive manufacturing were examined at 650 °C. The creep rupture lives and ductilities of materials produced by additive manufacturing were lower than those of conventionally wrought material. The horizontal-direction specimen exhibited inferior creep life and worse ductility than the vertical-direction specimen because of the direction of the interdendritic δ-phase precipitates, which were arrayed perpendicular to the stress axis in the former specimen. The morphology and a row of interdendritic δ-phase with incoherent interfaces were found to affect the materials' creep life and ductility. Graphical abstract: