Carbon-induced corrosion of metals and alloys

T. A. Ramanarayanan, C. M. Chun, J. D. Mumford

Research output: Contribution to journalConference article

4 Scopus citations

Abstract

Many high temperature alloys are based on Fe, Ni and Co with significant levels of chromium added for corrosion resistance. During service in carbon-rich environments, such alloys can degrade by two distinct corrosion processes. One is carburization, which generally occurs at temperatures in the range, 800 - 1100°C, while the other is metal dusting which typically manifests itself in the range, 400 - 800°C. In the present paper the sequential stages of alloy degradation when exposed to mixed carburizing-oxidizing environments having a carbon activity of ∼ 1 are discussed. Four distinct stages of microstructure evolution are described. In the final stages, carbon diffusion into the alloy interior followed by the precipitation of stable, brittle carbide phases affect the mechanical integrity of the material. By contrast metal dusting is a process that occurs in carbon - supersaturated environments (carbon activity > 1) and results in the actual conversion of bulk metal to powder or dust. The mechanistic aspects of metal dusting are discussed with particular attention to the behavior of Fe.

Original languageEnglish (US)
Pages (from-to)55-76
Number of pages22
JournalMaterials Science Forum
Volume369-372
Issue numberI
StatePublished - Dec 6 2001
Externally publishedYes
Event5th International Symposium on High Temperature Corrosion and Protection of Materials - Les Embiez, France
Duration: May 22 2000May 26 2000

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Ramanarayanan, T. A., Chun, C. M., & Mumford, J. D. (2001). Carbon-induced corrosion of metals and alloys. Materials Science Forum, 369-372(I), 55-76.