Critical assessment of the evaluation of thermal desorption spectroscopy data for duplex stainless steels: A combined experimental and numerical approach

被引：45
作者：
Claeys, L. [1 ]
Cnockaert, V. [1 ]
Depover, T. [1 ]
De Graeve, I. [2 ]
Verbeken, K. [1 ]
机构：
[1] Univ Ghent, Grp Sustainable Mat Sci, Dept Mat Text & Chem Engn, Technol Pk 46, B-9052 Zwijnaarde, Belgium
[2] Vrije Univ Brussel, Grp Electrochem & Surface Engn SURF, Dept Mat & Chem, Pl Laan 2, B-1050 Brussels, Belgium
来源：
ACTA MATERIALIA | 2020年 / 186卷
关键词：
Thermal desorption spectroscopy; Duplex stainless steel; Hydrogen diffusion; Hydrogen trapping; Diffusion activation energy; HYDROGEN; DIFFUSION; DEGRADATION; TRANSPORT; SUSCEPTIBILITY; TRANSFORMATION; DEFORMATION; PERMEATION; BEHAVIOR; METALS;
D O I：
10.1016/j.actamat.2019.12.055
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：190 / 198
页数：9
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