Phase Transformations and Interstitial Atom Diffusion in Iron-Nitride, Iron-Carbonitride and Iron-Carbide Layers

Abstract:

α-Iron foils were exposed to various gas atmospheres containing all or a number of the components NH3, CO, H2 and N2 for different periods of time at 550°C. In this way surficial compound layers were generated which contain different iron nitrides (ε, γ’), iron carbonitride (ε) and/or iron carbide (cementite, Fe3C). These compound layers were used to study phase transformations associated with N- and/or Cdiffusion processes in the corresponding phases. These studies involved (a) the layer-growth kinetics of cementite and (b) various solid-state phase transformations occurring in compound layers upon annealing in vacuum.

• Periodical: Advances in Science and Technology (Volume 46)
• Pages: 32-41
• DOI: https://doi.org/10.4028/www.scientific.net/AST.46.32
• Online since: October 2006
• Authors: Andreas Leineweber, Tatiana Liapina, Thomas Gressmann, Marc Nikolussi, Eric Jan Mittemeijer
• Keywords: Cementite, Diffusion, Interstitial Alloys, Iron Nitrides, Nitriding, Nitrocarburizing

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