Paper Title:

SIMS Analysis of Deuterium Absorption and Diffusion in Austenitic Fe-Mn-C Steels

Periodical Defect and Diffusion Forum (Volumes 323 - 325)
Main Theme Diffusion in Materials - DIMAT 2011
Chapter Chapter 9: Diffusion in Alloys and Intermetallics
Edited by I. Bezverkhyy, S. Chevalier and O. Politano
Pages 477-483
DOI 10.4028/www.scientific.net/DDF.323-325.477
Citation T. Dieudonné et al., 2012, Defect and Diffusion Forum, 323-325, 477
Online since April 2012
Authors T. Dieudonné, Loïc Marchetti, François Jomard, M. Wery, J. Chêne, C. Allely, P. Cugy, C.P. Scott
Keywords Alloying Elements, Austenitic Fe-Mn-C Steels, Diffusion, Grain Size, Hydrogen, SIMS Analysis
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Austenitic Fe-Mn-C steels are Ultra High Strength Steels which may be used for the production of deep drawn automotive parts containing extremely high residual stress and strain levels. In consequence, hydrogen absorption occurring during the corrosion process in aqueous environments may enhance the sensitivity of these steels to different kinds of hydrogen-induced damage, in particular Stress Corrosion Cracking (SCC). In order to predict and prevent SCC, it is important to study the behaviour of hydrogen in these austenitic steels exposed to aqueous environments and in particular the dependence on the alloy chemistry and microstructure. SIMS profiles of deuterium introduced by cathodic charging in selected specimens were used to characterize the diffusion of hydrogen in these steels. This allowed to be studied the role of chemical composition and microstructure on the kinetics of H absorption at room temperature. The competition between bulk matrix diffusion and short-circuit diffusion phenomena along grain boundaries was investigated. The results show a strong dependence of H diffusion and distribution on the alloy chemistry and grain size.

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