Effect of yttrium addition on creep properties of a Ni-base superalloy built up by selective laser melting. (1st July 2020)

• Record Type: Journal Article
• Authors: Kakehi, Koji; Banoth, Santhosh; Kuo, Yen-Ling; Hayashi, Shigenari
• Is Part Of: Scripta materialia. Number 183(2020)
• Page Start: 71
• Page End: 74
• Publication Date: 2020-07-01
• Subjects: Superalloy -- Creep -- Yttrium addition -- Selective laser melting -- δ phase; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.03.014
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The effects of yttrium (Y) addition on the creep properties of a Ni-base superalloy fabricated by selective laser melting (SLM) were examined at 650 °C. The creep rupture life and ductility of a superalloy produced by SLM were improved by the addition of Y. In the Y-free superalloy, Al-rich oxide particles were observed around the δ phase which is detrimental to creep life and ductility. The adding of Y to SLM superalloy formed Y oxide (yttrria) instead of Al-rich oxide, and it brought about the suppression of δ-phase precipitate growth and improved creep properties. Graphical abstract: Image, graphical abstract