Journal
ACTA MATERIALIA
Volume 186, Issue -, Pages 190-198Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2019.12.055
Keywords
Thermal desorption spectroscopy; Duplex stainless steel; Hydrogen diffusion; Hydrogen trapping; Diffusion activation energy
Funding
- FWO [1S16618N, 12Z0420N]
- special research fund (BOF) of Ghent University [BOF01P03516]
- BOF [BOF15/BAS/062]
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The present study evaluates thermal desorption spectroscopy (TDS) data measured for UNS S32205 duplex stainless steel. Variations in the TDS spectra are obtained by electrochemical hydrogen charging for different times and by applying different heating rates for desorption to evaluate the desorption activation energy. Good agreement is found when comparing the experimental TDS curves with the desorption flux based on a numerical diffusion model using a homogeneous average hydrogen diffusion coefficient for the two-phase (ferrite-austenite) duplex microstructure. Trapping cannot be distinguished from the experimental TDS data since hydrogen diffusion in austenite is the rate-determining process during desorption. An average diffusion activation energy of 43.4 kJ/mol is determined from the experiments. Moreover, similar findings are obtained with a finite-element model that includes the heterogeneous hydrogen-related properties of the two phases of this duplex stainless steel. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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