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Incubation time for iron-nitride layer formation upon gaseous nitriding of iron-based alloys
Jung, Minsu,Meka, Sai Ramudu,Mittemeijer, Eric Jan Abingdon; Taylor & Francis Ltd 2016 PHILOSOPHICAL MAGAZINE Vol.96 No.14
<P>A model was developed to predict quantitatively the influence of alloying element (Me) dissolved in the ferrite (alpha) matrix on the incubation time for iron-nitride layer formation upon gaseous nitriding of iron-based alloys. The model incorporates the coupled, concurrent processes of inward diffusion of nitrogen and the depth dependency of the time dependency of the precipitation of alloying-element nitride particles in the a matrix. Experimental results were obtained by gaseous nitriding of an Fe-2.23 at.% V alloy. The incubation time for iron-nitride formation on Fe-Me alloy is generally much larger than that for iron-nitride formation on pure iron due to a pronouncedly lesser rate of increase of dissolved N content at the surface of Fe-Me alloy. The extent of segregation of N at the MeN/alpha-Fe interfaces has distinct influence on the incubation time.</P>