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Behavior of nitrided and carburized AISI 904 L stainless steels under severe light ion beam irradiation with plasma focus
Author(s) -
García Molleja J.,
Milanese M.,
Gómez B. J.,
Moroso R.,
Piccoli M.,
Niedbalski J.,
Bürgi J.,
Bemporad E.,
Feugeas J.
Publication year - 2015
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5770
Subject(s) - materials science , nitriding , austenite , irradiation , nitride , ion , ion beam , plasma , metallurgy , analytical chemistry (journal) , composite material , microstructure , layer (electronics) , chemistry , physics , organic chemistry , quantum mechanics , chromatography , nuclear physics
Superaustenitic stainless steels have become of growing interest in industrial and technological fields, but there is not a complete understanding on their fundamental properties and their performances. For this paper, AISI 904 L superaustenitic samples were nitrided and carburized in order to study the expanded austenite stability under severe deuterium and helium ion bombardment. Surface treatments were conducted using pulsed plasma glow discharges in a low pressure atmosphere, and a dense plasma focus device was used to irradiate the samples. Characterization techniques used were focused ion beam/SEM, energy‐dispersive X‐ray spectroscopy, and grazing incidence X‐ray diffraction. Our results showed in carburized samples lattice expansion growth with the time treatment, but in nitrided samples, an expanded austenite reduction with time treatment was observed due to the formation of nitride nanoagglomerates. Moreover, this ion impingement provoked surface melting and a severe collision cascade, and a damaged bead located under the craters composed solely of minor alloying atoms. Furthermore, nitrided samples were more stable following ion bombardment than the carburized ones. When helium ions were used, the loss of expansion (triggered by diffusion processes of N or C to deeper regions) was more pronounced in the expanded austenite, but when deuterium ions were used to bombard the sample, there was a crystallite development of stressed austenite, which provoked a diffraction peak arousal at 43.3°. Copyright © 2015 John Wiley & Sons, Ltd.