Nitrogen diffusion and nitrogen depth profiles in expanded austenite: experimental assessment, numerical simulation and role of stress

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Abstract

The present paper addresses the experimental assessment of the concentration dependent nitrogen diffusion coefficient in stress free expanded austenite foils from thermogravimetry, the numerical simulation of nitrogen concentration depth profiles on growth of expanded austenite into stainless steel during gaseous nitriding, a qualitative discussion of the role of stress on local equilibrium conditions of growing expanded austenite and a discussion of the erroneous concentration dependent diffusivity of nitrogen in expanded austenite as obtained from applying the Boltzmann-Matano method to composition-depth profiles.
Original languageEnglish
JournalMaterials Science and Technology
Volume24
Issue number2
Pages (from-to)159-167
ISSN0267-0836
DOIs
Publication statusPublished - 2008

Keywords

  • Stainless steel
  • Kinetics
  • Surface
  • Temperature
  • Iron
  • Ion- implantation

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