A nanostructured surface layer was formed on a pure iron plate by means of surface mechanical attrition treatment (SMAT). It was found that a SMAT iron sample developed a nitrided layer twice as thick as that on a coarse-grained sample under the same gaseous nitriding conditions (500 degrees C for 2 h), which is attributed to the fast diffusion of nitrogen along grain boundaries in the nanostructured iron. The nitrided layer of SMAT sample exhibited a high hardness and an excellent wear resistance. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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