Abstract
Hydrogen-induced phases in stable austenitic stainless steels which do not undergo any transformations by cold work or low temperature cooling have been an object of several studies. As was shown in a previous study, alloying with nitrogen increases the stability of Cr18Ni16Mn10 steel with respect to hydrogen-induced [epsilon][sub H] formation and, at nitrogen contents of more than 0.5 wt. %, the [epsilon][sub H] phase is no longer formed. As nitrogen retards the HE of austenitic stainless steels, it is important to test its stabilizing effect in steels of different compositions. The present paper aims to study the formation and disappearance of hydrogen-induced phases in AISI 310 type steel during hydrogen charging and outgassing. This study concludes that alloying with nitrogen retards the formation of the phase [epsilon][sub H] that is caused by hydrogen charging; and the change of [gamma] reflections in diffraction patterns during the aging of hydrogen-charged steels does not confirm either the occurrence of a modulated structure or the existence of the [gamma][sub H] phase ([gamma]*) as a pseudo-hydride precipitated through spinodal decomposition of hydrogenated austenite.
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