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A finite element study of hydrogen diffusion in duplex stainless steel

Abstract

ABAQUS FE simulations of hydrogen diffusion in duplex stainless steel have been performed.
Three models with different ferrite-austenite configurations have been applied and the hydrogen
diffusion and the hydrogen coefficient have been evaluated as a function of austenite
phase size and shape and the calculated diffusion coefficients compared to literature. Hydrogen
concentration due to stress and plastic strain close to an embedded flaw has also been
evaluated. An important observation is that the simulations show that when the austenite phases
are saturated with hydrogen there is no large difference in the overall diffusion rate between
the small and large phased models, i.e. no influence of tortuosity is observed. The work clearly
demonstrates that both microstructure and flaws will influence the hydrogen diffusion and the
hydrogen concentration and hence, must be taken into account when evaluating the susceptibility
of hydrogen stress cracking in duplex stainless steels.

Category

Academic lecture

Language

English

Author(s)

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • Norwegian University of Science and Technology

Presented at

Steel & Hydrogen Conference 2014

Place

Gent

Date

05.05.2014 - 07.05.2014

Organizer

Lode Duprez, Department Manager Metallurgy at OCAS, Zelzate

Year

2014

External resources

View this publication at Cristin