Creep Property and Phase Stability of Sulfur-Doped Ni-Base Single-Crystal Superalloys and Effectiveness of CaO Desulfurization

Satoshi Utada*, Yuichiro Joh, Makoto Osawa, Tadaharu Yokokawa, Takuya Sugiyama, Toshiharu Kobayashi, Kyoko Kawagishi, Shinsuke Suzuki, Hiroshi Harada

*この研究の対応する著者

研究成果: Article査読

10 被引用数 (Scopus)

抄録

The direct and complete recycling method for Ni-base superalloy is being developed and studied to reduce the material cost for cost-effective operation of gas turbine systems. Understanding the effect of sulfur contamination is important to determine allowable sulfur content after the recycling. However, in the case of single-crystal superalloys, this effect on material properties is not well known except for the detrimental effect on the oxidation resistance. In the present study, creep tests, aging tests, and cyclic oxidation tests have been performed on PWA1484 with varying sulfur content. The increasing sulfur content has been found to correlate with degradation of properties evaluated here. It is observed that the decrease in creep life in PWA1484 due to sulfur doping is primarily due to coarsening of the γ/γ′ interfacial dislocation network, increase in precipitation kinetics of topologically closed-packed phase, and decrease in oxidation resistance. For recycling purposes, a CaO crucible was used in the casting process, which successfully decreased the sulfur level in the alloy, and the resulting material showed comparable or even better properties in comparison to the low sulfur content material.

本文言語English
ページ(範囲)4029-4041
ページ数13
ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
49
9
DOI
出版ステータスPublished - 2018 9 1

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金

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