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Microstructural evolution of a carbon modified single crystal Ni-base superalloy

Authors
Journal
Materials Characterization
1044-5803
Publisher
Elsevier
Volume
74
Identifiers
DOI: 10.1016/j.matchar.2012.06.008
Keywords
  • Superalloys
  • Microstructures
  • Carbon Additions
  • Stability
Disciplines
  • Mathematics

Abstract

Abstract The effects of heat treatments and long term exposures of C-containing modifications of CMSX-4 were examined. Some of the alloys examined also contained additions of boron or nitrogen. Significant changes to as-cast carbide morphologies were observed. Long-term exposure caused significant MC carbide decomposition and formation of Cr-rich secondary carbides on or near to decomposing carbides. Increased topologically close-packed phase formation occurred in some cases, while, in other alloys no topologically close-packed phases were observed. All three modifications experienced more γ′ coarsening than baseline CMSX-4.

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