Journal of Materials Science

, Volume 34, Issue 19, pp 4793–4802

X-ray diffraction characterisation of low temperature plasma nitrided austenitic stainless steels

Article

DOI: 10.1023/A:1004647423860

Cite this article as:
Sun, Y., Li, X.Y. & Bell, T. Journal of Materials Science (1999) 34: 4793. doi:10.1023/A:1004647423860

Abstract

The nitrided layers produced by low temperature (400–500 °C) plasma nitriding on austenitic stainless steels, AISI 316, 304 and 321, have been characterised by X-ray diffraction, in conjunction with metallographic and chemical composition profile analysis. The thin, hard and corrosion resistant layers exhibited similar X-ray diffraction patterns, but the positions of the major diffraction peaks varied with nitriding temperature and nitrogen concentration profile. The low temperature nitrided layers are predominantly composed of a phase with a face centred cubic (fcc) structure, which is named “S” phase. However, the positions of the diffraction peaks from the “S” phase deviated in a systematic way from those for an ideal fcc lattice. Detailed analysis of the deviation suggested that very high compressive residual stresses and stacking faults were formed in the layers, resulting in a highly distorted and disordered fcc structure. The lattice parameter of the distorted and disordered “S” phase was found to increase with increasing nitrogen concentration.

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  1. 1.School of Metallurgy and MaterialsUniversity of BirminghamBirminghamUK

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