X-ray diffraction of high nitrogen face centred cubic phase formed on nitrogen modified austenitic stainless steel
Authors: Lei, M. K.; Liang, J.
Source: Surface Engineering, Volume 26, Number 4, May 2010 , pp. 305-311(7)
Publisher: Maney Publishing
Abstract:High nitrogen face centred cubic phase formed on the nitrogen modified Fe–Cr–Ni austenitic stainless steel, which is named by N phase, has a combined wear and corrosion resistance. X-ray diffraction (XRD) patterns of the N phase on the stainless steel depict a set of broad and asymmetry diffraction peaks with a peak shift to low Bragg angles and a decrease in intensity, even disappearing of some peaks of high index planes, from each austenite peak for the matrix. The peak shift of the XRD patterns was first explained by Warren's XRD theory by Blawert et al. (Surf. Coat. Technol., 2001, 136, 181). In this paper, a systematic study of XRD on the peak shift, peak asymmetry, peak broadening and peak intensity of the N phase has been carried out, based on a fault induced scattering geometry in diffraction to imperfect crystals by Warren's theory and Wagner's method. Both the higher deformation faults density α in a range of 0·02–0·25 and the lower twin faults density of 0·01–0·1 were successfully used to describe the line profiles in the XRD patterns of the N phase formed on plasma source ion nitrided 1Cr18Ni9Ti (18-8 type) austenitic stainless steel. A novel stacking faults factor Sα dependent on α and described, in good agreement, the peak intensity of the N phase. The calculated XRD patterns of the N phase using the imperfect crystals model of a face centred cubic phase with a higher deformation faults density and a lower twin faults density were associated with the experimentally structural characteristics.
Document Type: Research Article
Affiliations: Surface Engineering Laboratory, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Publication date: May 2010
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