Effect of surface treatment and crystal orientation on hot corrosion of a Ni-based single-crystal superalloy

X. Montero, A. Ishida, T. M. Meißner, H. Murakami, M. C. Galetz

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The effect of surface preparation and crystal orientation was investigated for a TMS-138 single crystal superalloy under Type I and Type II hot corrosion conditions. The superalloy was cut along the {100} and {110} planes on which grit blasting, mechanical polishing and electro-polishing surface finishes were conducted. At 900 °C grit blasting or electropolishing distorted the surface and altered the γ-γ’ structure of the alloy provoking higher corrosion rates than on mechanically polished surfaces. The electropolished surface revealed that crystal planes with higher atomic number density have an increased corrosion resistance. The anisotropy effects were not observed with Type II exposures.

Original languageEnglish
Article number108472
JournalCorrosion Science
Volume166
DOIs
Publication statusPublished - 2020 Apr 15

Keywords

  • Anisotropy
  • Crystal orientation
  • Hot corrosion
  • Ni-base
  • Single crystal
  • Superalloy
  • Type I
  • Type II

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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