Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 462, Issue 1-2, Pages 169-173Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.02.459
Keywords
pulse plasma nitriding; Fe-N system; growth kinetics; iron nitrides; computer simulation
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In this work, the pulse plasma nitriding process of pure iron is modelled using a kinetic model derived from the Fick's laws. This approach based on the error function model allows to simulate the growth kinetics of a biphase configuration consisting of gamma '-Fe4N1-x and epsilon-Fe2-3N iron nitrides under specified conditions. By coupling the kinetics data about the diffusivities of nitrogen in (alpha-Fe, (gamma ') and epsilon phases to the thermodynamic description of the Fe-N phase diagram, it is possible to evaluate the kinetic constant at each growing phase interface, the thickness of nitrided layer, and predict the nitrogen concentration profiles. The comparison between the experimental and theoretical results shows the reliability of the simulation results. (C) 2006 Elsevier B.V. All rights reserved.
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