CONDITIONS FOR THE FORMATION OF A MARTENSITIC SINGLE-PHASE COMPOUND LAYER IN ION-NITRIDED 316L AUSTENITIC STAINLESS-STEEL

Citation
K. Marchev et al., CONDITIONS FOR THE FORMATION OF A MARTENSITIC SINGLE-PHASE COMPOUND LAYER IN ION-NITRIDED 316L AUSTENITIC STAINLESS-STEEL, Surface & coatings technology, 99(3), 1998, pp. 225-228
Citations number
6
Categorie Soggetti
Materials Science, Coatings & Films
ISSN journal
02578972
Volume
99
Issue
3
Year of publication
1998
Pages
225 - 228
Database
ISI
SICI code
0257-8972(1998)99:3<225:CFTFOA>2.0.ZU;2-C
Abstract
The formation of a single phase structure (m) in an ion-nitrided 300 s eries stainless steel was confirmed by X-ray diffraction, microprobe a nd microhardness profiles. The m phase has a depth-dependent, variable nitrogen content between 30 and 20 at. pet. N (with increasing depth) . A time-temperature (t-T) map of m phase formation upon treatment in 65% N-2, 35% N-2 is presented for 316L steel, The m phase forms at nit riding temperatures up to 510 degrees C but occurs as a single phase o nly up to 480 degrees C; at higher temperatures and by long treatment times, m is destabilized in favor of gamma' + CrN. A tetragonal (marte nsitic) structure for m previously reported in the literature remains tentative. (C) 1998 Elsevier Science S.A.