On the mechanism of ion nitriding of an austenitic stainless steel

Citation
L. Pranevicius et al., On the mechanism of ion nitriding of an austenitic stainless steel, SURF COAT, 135(2-3), 2001, pp. 250-257
Citations number
26
Categorie Soggetti
Material Science & Engineering
Journal title
SURFACE & COATINGS TECHNOLOGY
ISSN journal
02578972 → ACNP
Volume
135
Issue
2-3
Year of publication
2001
Pages
250 - 257
Database
ISI
SICI code
0257-8972(20010115)135:2-3<250:OTMOIN>2.0.ZU;2-N
Abstract
The mechanism of nitrogen transport has been investigated in an austenitic stainless steel (AISI 304) under high flux and low energy nitrogen ion beam irradiation at moderate temperatures in the range 270-550 degreesC, The pr ofiles of the distribution of nitrogen have been analyzed with nuclear reac tion analysis (NRA) and glow discharge optical spectroscopy (GDOS), and the surface roughness with scanning AFM. The modeling is based on the study of the stochastic mixing of atoms 'ballistically' displaced by incident ions. The development of surface roughness and the formation of an altered layer highly enriched by nitrogen are analyzed, and it is concluded that the tra nsport of nitrogen into the bulk results from a flux of matrix atoms driven by mobile vacancies at temperatures above 350 degreesC. This behavior is c onsistent with an altered layer 'growth' that is controlled by the ion-beam -induced displacements of surface atoms. (C) 2001 Elsevier Science B.V. All rights reserved.