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Advances in Materials Science and Engineering
Volume 2013 (2013), Article ID 217848, 6 pages
http://dx.doi.org/10.1155/2013/217848
Research Article

Effect of Process Parameters on Gas Nitriding of Grey Cast Iron

School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

Received 2 August 2013; Revised 22 October 2013; Accepted 18 November 2013

Academic Editor: Martha Guerrero

Copyright © 2013 Nana Wang and Jinxiang Liu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Gas nitriding process parameters have significant effects on the nitriding layer of material. In the present work, a series of gas nitriding experiments on pearlitic grey cast iron specimens were carried out at different temperatures. To study the influence of nitriding process parameters on the nitriding layer, the numerical simulations of nitriding processing are performed, which take into account the threshold value of nitriding potential. The results show that the numerical simulations, incorporating the nitriding potential’s threshold value, can accurately predict the case depth and nitrogen concentration profile. The nitriding layer increases with increasing nitriding time and temperature, whereas the nitrogen concentration on the surface decreases with increasing temperature. Besides, the results also reveal that the nitriding potential nearly has no effect on the case depth, whereas it has great influence on nitrogen concentration on the surface and chemical composition of the compound layer.