Metal dusting corrosion of ferritic steels with varying chromium content

Research output: Contribution to conferencePaper

Abstract

The present study focuses on the metal dusting behavior of ferritic steels as a function of Cr content ranging from 1.25 to 20 wt.% Cr in carbon-supersaturated environments (CO-H2) over the temperature range, 350 ∼ 600°C. With increasing Cr content the overall corrosion rate decreases and the corrosion becomes more localized. All low chromium ferritic steels (e.g. 11/4Cr-1/2Mo and 5Cr-1/2Mo) in an overall sense disintegrate by metastable surface M3C formation and growth and its subsequent decomposition upon carbon deposition, in good agreement with the mechanism for pure iron. While the presence of a continuous M3C layer is characteristic of general corrosion, such a layer is absent in ferritic steels having more than 5 pct chromium (e.g. 9Cr, 13Cr and 20Cr). High-resolution electron microscopy of such steels reveals, in addition to metal particles and a mixture of graphitic and amorphous carbon, stable carbide (M7C3) particles in the corrosion product. The mechanistic aspects of metal dusting are discussed with particular attention to stages of microstructure evolution as degradation proceeds.

Original languageEnglish (US)
Pages101-115
Number of pages15
StatePublished - Dec 1 2004
Externally publishedYes
Event206th ECS Meeting - Honolulu, HI, United States
Duration: Oct 3 2004Oct 8 2004

Conference

Conference206th ECS Meeting
CountryUnited States
CityHonolulu, HI
Period10/3/0410/8/04

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Chun, C. M., & Ramanarayanan, T. A. (2004). Metal dusting corrosion of ferritic steels with varying chromium content. 101-115. Paper presented at 206th ECS Meeting, Honolulu, HI, United States.