Microstructure changes and oxidation resistance of aluminized Ni-based single crystal superalloys

Hideyuki Murakami, Kazuki Kasai

研究成果: Conference contribution

抄録

Microstructural changes and oxidation resistance of simply aluminized Ni-based single-crystal superalloys were systematically investigated. There are several kinds of microstructural changes observed in the as-aluminized Ni-based single crystal superalloys. For instance, in the case of a gritblasted specimen, secondary reaction zone (SRZ) was formed in the vicinity of substrate/coating interfaces. On the other hand, in the polished specimens, voids were formed by thermal cyclic heating. It is also found that grit-blasted specimens with SRZ formation exhibited accelerated oxidation. Microstructural changes are slightly accelerated along 〈110〉 direction rather than 〈100〉 direction. These experimental results can be explained by the recrystallization of substrate surfaces and subsequent interdiffusion between the coated layer and the substrate. Cyclic oxidation tests were also performed to assess the oxidation resistance of specimens with different microstructure and it is found that specimens with SRZ formation demonstrated worse oxidation resistance than those with voids formation, probably due to the difference in interdiffusion of solute elements between aluminized coatings and substrates.

本文言語English
ホスト出版物のタイトルSUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys
編集者Mark Hardy, Eric Huron, Uwe Glatzel, Brian Griffin, Beth Lewis, Cathie Rae, Venkat Seetharaman, Sammy Tin
出版社Minerals, Metals and Materials Society
ページ719-726
ページ数8
ISBN(電子版)9781118996669
DOI
出版ステータスPublished - 2016
外部発表はい
イベント13th International Symposium on Superalloys, SUPERALLOYS 2016 - Seven Springs, United States
継続期間: 2016 9月 112016 9月 15

出版物シリーズ

名前Proceedings of the International Symposium on Superalloys
2016-January

Other

Other13th International Symposium on Superalloys, SUPERALLOYS 2016
国/地域United States
CitySeven Springs
Period16/9/1116/9/15

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学

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