General view of rhenium-rich particles along defect grain boundaries formed in nickel-based single-crystal superalloy turbine blades: formation, dissolution and comparison with other phases

Research output: Contribution to journalArticlepeer-review

Abstract

Nickel-based single-crystal superalloy turbine blades have been widely used in engines of aircrafts or power plants, but some defect grains are often found on the surface of the blade after full heat treatment or even after casting. Rhenium-rich particles, as well as an intermediate layer, were almost always detected along any defect grain boundary region, if it existed, from a low-angle grain boundary to a high-angle boundary. The particles were also found on the top surface of the base material. The composition and morphology of the particles were different from the most common topologically close packed phases or a fine particle with similar morphology detected at the boundary region between a recrystallized grain and a matrix grain. An additional heat treatment could completely dissolve the fine particles. Furthermore, any rhenium-rich particles were not reformed after achieving uniform distribution of the alloying elements.

Original languageEnglish
Article number1201
JournalCrystals
Volume11
Issue number10
DOIs
Publication statusPublished - 6 Oct 2021

Keywords

  • Cross section
  • Investment casting
  • Oxidation
  • Surface defect
  • Turbine blade

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

Fingerprint

Dive into the research topics of 'General view of rhenium-rich particles along defect grain boundaries formed in nickel-based single-crystal superalloy turbine blades: formation, dissolution and comparison with other phases'. Together they form a unique fingerprint.

Cite this