Effect of yttrium addition on creep properties of a Ni-base superalloy built up by selective laser melting

SCRIPTA MATERIALIA

卷:183

Article

Kakehi, Koji¹  Banoth, Santhosh¹  Kuo, Yen-Ling²  Hayashi, Shigenari² 

[1] Tokyo Metropolitan Univ, Dept Mech Syst Engn, 1-1 Minami Osawa, Hachioji, Tokyo 1920397, Japan

[2] Hokkaido Univ, Fac Engn, Div Mat Sci & Engn, Kita Ku, N13W18, Sapporo, Hokkaido 0608628, Japan

关键词: Superalloy;    Creep;    Yttrium addition;    Selective laser melting;    delta phase;   

DOI  :  10.1016/j.scriptamat.2020.03.014

来源: Elsevier

【 摘 要 】

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 degrees 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 delta 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 delta-phase precipitate growth and improved creep properties. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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