Improvement in Creep Properties of Ni Based Superalloy Fabricated by Selective Laser Melting by Yttrium Addition

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  • 選択的レーザー溶融法により造形したNi基超合金におけるY添加によるクリープ特性改善

Abstract

<p>The effects of yttrium (Y) addition on the creep properties of a Ni-based superalloy fabricated by selective laser melting (SLM) were examines at 650°C. The creep rupture life and ductility of a superalloy produced by SLM were improved by 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.</p>

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