Effect of surface treatment and crystal orientation on microstructural changes in aluminized Ni-based single-crystal superalloy

Kazuki Kasai, Hideyuki Murakami, Seiji Kuroda, Hachiro Imai

研究成果: Article査読

1 被引用数 (Scopus)

抄録

The effect of pre-surface treatment and crystal orientation on microstructural changes in the aluminized 4th generation Nibased single-crystal superalloy TMS-138 was investigated. The substrate superalloy was cut along the {100} and {110} planes on which three kinds of surface finishing, such as grit-blasting, mechanically polishing and electro-polishing were conducted prior to the conventional high-activity aluminizing process. A thermal cycling test at 1373 K revealed that heavy deformation of substrate surface by grit blasting gave rise to the formation of a secondary reaction zone (SRZ) in the vicinity of interdiffusion zone/substrate interfaces. While when the surfaces were finished by electro-polishing, voids were formed in the vicinity of interdiffusion zone/substrate interfaces. It is also found that accelerated formation of SRZ and voids was observed along <110> directions rather than <100> directions during the thermal cycling test. The difference in morphological changes of substrates can be related to the residual stress introduced by the surface finishing.

本文言語English
ページ(範囲)19-23
ページ数5
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
74
1
DOI
出版ステータスPublished - 2010 1
外部発表はい

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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