Effects of yttrium and silicon contents in Hastelloy-X built by selective laser melting process

Santhosh Banoth*, Thaviti Naidu Palleda, Takuma Saito, Hideyuki Murakami, Koji Kakehi

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

The effects of the addition of yttrium (Y) on the creep and tensile properties of Hastelloy-X built by a selective laser melting (SLM) process were studied. Two alloys were chosen: Hastelloy-X (Y-free) as a reference material and a specimen with 0.046 wt% yttrium (Y-added). Post-processing solution heat treatment (ST) was conducted at 1177 °C in air for 2 h, followed by air cooling to obtain appreciable mechanical properties. In the as-built condition, the Y-free specimen showed the formation of cracks; this was mainly due to the segregation of solute elements such as W, Si, and C at the grain boundaries and interdendritic regions. The Y-added specimen was free of cracks and showed longer creep life and rupture elongation than the Y-free specimen because the reduced Si content in the Y-added alloy eliminated cracking. In addition, the formation of Y2O3 oxides improved tensile elongation and creep properties by stabilizing solute oxygen contamination. After ST, both vertical and horizontal Y-added specimens presented better creep properties than ST Y-free specimens. This was mainly due to grain morphological change, carbides, and oxides formation at the grain boundary after ST heat treatment in the Y-added specimens.

本文言語English
論文番号163050
ジャーナルJournal of Alloys and Compounds
896
DOI
出版ステータスPublished - 2022 3月 10

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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