Determination of Concentration Dependent Diffusion Coefficients of Carbon in Expanded Austenite

Thomas Strabo Hummelshøj, Thomas Christiansen, Marcel A. J. Somers

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Abstract. In the present paper various experimental procedures to experimentally determine the concentration dependent diffusion coefficient of carbon in expanded austenite are evaluated. To this end thermogravimetric carburization was simulated for various experimental conditions and the evaluated composition dependent diffusivity of carbon derived from the simulated experiments was compared with the input data. The most promising procedure for an accurate determination is shown to be stepwise gaseous carburizing of thin foils in a gaseous atmosphere; the finer the stepsize, the more accurate the approximation of the diffusivity. Thermogravimetry was applied to continuously monitor the weight change of thin foils of AISI 316 during carburizing in CO-H2 gas mixtures for one of the simulated experimental procedures.
Original languageEnglish
JournalDefect and Diffusion Forum
Volume273-276
Pages (from-to)306-311
ISSN1012-0386
Publication statusPublished - 2008

Keywords

  • Stainless steel
  • Kinetics
  • Diffusion

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