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Influence Of Cold Deformation On Hydrogen Embrittlement By Determining The Critical Hydrogen Concentration In High Strength Steel For Wire Applications

Picture for Influence Of Cold Deformation On Hydrogen Embrittlement By Determining The Critical Hydrogen Concentration In High Strength Steel For Wire Applications
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The threshold hydrogen content of a material regarding hydrogen embrittlement plays an increasingly important role in corrosion research. This value indicates the hydrogen content to which the material can be used without failure. However, when determining the threshold hydrogen content, different test methods, different analysis methods and different interpretations of the results come together. This paper is intended to provide a guideline for the determination of the critical hydrogen concentration of high strength steel wire samples.

Product Number: 51322-17639-SG
Author: M. Truschner, P. Gruber, J. Deutsch, J. Pengg, G. Mori, H. Köberl
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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The resistance of steel wires to hydrogen embrittlement is very difficult to define and is therefore rarely investigated in literature. In this work a C65 steel wire was tested in hot rolled condition and after cold working. Both material states were first cathodically charged in sodium chloride (NaCl) with addition of thiourea (CH4N2S) at different current densities to determine the hydrogen content of each charging condition. In the next step mechanical properties and susceptibility to hydrogen induced stress corrosion cracking (HISCC) were determined in Slow Strain Rate Tests (SSRT). To prevent hydrogen effusion during experiments, samples were additionally further charged during the SSRT. Critical hydrogen concentrations for initiation of HISCC of both material states have been determined, whereas the critical
hydrogen concentration is lower in the hot rolled state.

The resistance of steel wires to hydrogen embrittlement is very difficult to define and is therefore rarely investigated in literature. In this work a C65 steel wire was tested in hot rolled condition and after cold working. Both material states were first cathodically charged in sodium chloride (NaCl) with addition of thiourea (CH4N2S) at different current densities to determine the hydrogen content of each charging condition. In the next step mechanical properties and susceptibility to hydrogen induced stress corrosion cracking (HISCC) were determined in Slow Strain Rate Tests (SSRT). To prevent hydrogen effusion during experiments, samples were additionally further charged during the SSRT. Critical hydrogen concentrations for initiation of HISCC of both material states have been determined, whereas the critical
hydrogen concentration is lower in the hot rolled state.

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