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An alternative and comprehensive approach to estimate trapped hydrogen in steels using electrochemical permeation tests |
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| Affiliation: | 1. R&D Division, Tata Steel Limited, Jamshedpur, 831001, India;2. Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India;3. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India;1. The State Key Laboratory of Refractories and Metallurgy, Hubei Province Key Laboratory of Systems Science on Metallurgical Processing, International Research Institute for Steel Technology, Collaborative Center on Advanced Steels, Wuhan University of Science and Technology, Wuhan, 430081, China;2. Metals Valley and Band (Foshan) Metallic Composite Materials Co., Ltd., Foshan, 528000, Guangdong, China;1. Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700, Leoben, Austria;2. Chair of General and Analytical Chemistry, Montanuniversität Leoben, Franz Josef-Straße 18, 8700, Leoben, Austria;3. Department of Materials Science, Montanuniversität Leoben, Franz Josef-Straße 18, 8700 Leoben, Austria;4. Voestalpine Stahl Donawitz GmbH, Kerpelystrasse 199, 8700, Leoben, Austria;5. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 22, CZ-616 62, Brno, Czech Republic;6. Institute of Mechanics, Montanuniversität Leoben, Franz-Josef-Str. 18, A-8700, Leoben, Austria |
| Abstract: | The present study critically discusses the apparent diffusivity of H during build-up and decay permeation transients in four microalloyed line-pipe steels using Devanathan-Stauchursky cell in galvanostatic-potentiostatic condition. Among the existing models, the Carvalho's solution has been found to give the best fit with the experimental build-up transient. The numerical solution of trapping and detrapping events of H during build-up transients is investigated by solving the McNabb-Foster model. The residual hydrogen was measured in the steels using LECO-DH603 hydrogen determinator after saturation H-charging. Further the Carvalho's exponent of permeation transient has been found to have good correlation with the H trapping-detrapping rates during the permeation test and also with the residual H content in the steel. Finally, empirical relationships have been proposed that can be used to estimate the residual H in the studied steels along with the trapping-detrapping parameters using the permeation test data. |
| Keywords: | Hydrogen embrittlement Devanathan-stachursky cell Hydrogen permeation Hydrogen trapping Numerical methods Permeation transient analysis |
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