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Determination of the concentration dependent diffusion coefficient of nitrogen in expanded austenite

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Authors:
  • Christiansen, Thomas ;
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    Orcid logo0000-0001-7144-1557
    Department of Mechanical Engineering, Technical University of Denmark
  • Somers, Marcel A. J.
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    Orcid logo0000-0001-7773-1432
    Department of Mechanical Engineering, Technical University of Denmark
DOI:
10.3139/146.101729
Abstract:
The concentration dependent diffusion coefficient of nitrogen in expanded austenite was determined from of the rate of retracting nitrogen from thin initially N-saturated coupons. Nitrogen saturated homogeneous foils of expanded austenite were obtained by nitriding AISI 304 and AISI 316 in pure ammonia at 693 K and 718 K. Denitriding experiments were performed by equilibrating the foils with a successively lower nitrogen activity, as imposed by a gas mixture of ammonia and hydrogen. The concentration dependent diffusion coefficient of nitrogen in expanded austenite was approximated in the composition range where nitrogen can be extracted by hydrogen gas at the diffusion temperature. Numerical simulation of the denitriding experiments shows that the thus determined concentration dependent diffusion coefficients are an accurate approximation of the actual diffusivity of nitrogen in expanded austenite.
Type:
Journal article
Language:
English
Published in:
International Journal of Materials Research, 2008, Vol 99, Issue 9, p. 999-1005
Keywords:
Main Research Area:
Science/technology
Submission year:
2008
ID:
6069630

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