Oxidation and decarburization in TRIP steels

T. L. Baum, R. J. Fruehan, S. Sridhar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

External oxidation during in-line heat treatment of TRIP steels can cause problems for the subsequent coating process. This research aims to elucidate the kinetic rates of internal oxidation, external oxidation and decarburization and their interdependence under different gas atmospheres and temperatures. A rolled steel sample chemistry of 0.14 wt.% C, 1.8 wt% Mn, 0.6 wt.% Si and 1 wt.% Al is used as a case study. Thermogravimetric techniques are used to examine the net mass change in a sample during heat treatment and the results show an initial mass decrease and later an increase for particular partial pressures of H2O. SEM-EDS, optical microscopy and glancing-angle x-ray are used to quantify the microstructure. The cross-section of the samples have 4 distinct zones: (i) an external scale, rich in fayalite, (ii) an internally oxidized region with Al, Si and Mn oxides in an Fe matrix, (iii) a decarburized steel region, characterized by large ferrite grains and low carbon content, and (iv) a relatively unaffected steel core with a structure similar to the starting material.

Original languageEnglish (US)
Title of host publicationSohn International Symposium
Subtitle of host publicationAdvanced Processing of Metals and Materials - Proceedings of the International Symposium
Pages285-298
Number of pages14
StatePublished - 2006
Externally publishedYes
Event2006 TMS Fall Extraction and Processing Division: Sohn International Symposium - San Diego, CA, United States
Duration: Aug 27 2006Aug 31 2006

Publication series

Name2006 TMS Fall Extraction and Processing Division: Sohn International Symposium
Volume2

Conference

Conference2006 TMS Fall Extraction and Processing Division: Sohn International Symposium
Country/TerritoryUnited States
CitySan Diego, CA
Period8/27/068/31/06

Keywords

  • Al-TRIP steel
  • Decarburization
  • Internal and external oxidation

ASJC Scopus subject areas

  • Engineering(all)

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