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Simultaneous numerical simulation of gas phase nitriding(NH3-H2) and of the nitrogen transfer in α-iron (550°C and 1 atm)(Part I)

Published online by Cambridge University Press:  24 June 2010

M. Rida  and
H. Tout
M. Rida
Affiliation:
Lebanese University, Faculty of Science (Section III), Department of physics, Tripoli, Lebanon
H. Tout
Affiliation:
Lebanese University, Faculty of Science (Section I), IT department, Beirut, Lebanon
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Abstract

We studied, in steady and in unsteady state, the gas-solid reaction of gas nitriding(NH3-H2) of steel, in order to control the atomic nitrogentransfer in α-iron as a function of the inlet flow rates. We obtained the simultaneoussimulation of the gas phase variations, and the nitrogen transfer in the sample. Theevolution of the nitrogen concentration at the surface and inside of the α-iron, as afunction of the time, is presented. The results are in good agreement with the experimentand with previous work. We also established a correlation between the gas compositionaround the sample and the inlet conditions, in order to obtain an optimal nitrogentransfer at the sample’s surface, and thus control the nitride layer growth.

Type
Research Article
Information
Metallurgical Research & Technology , Volume 107 , Issue 4 , April 2010 , pp. 117 - 124
Copyright
© EDP Sciences, 2010

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