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Hydrogen trapping in T24 Cr-Mo-V steel weld joints—microstructure effect vs. experimental influence on activation energy for diffusion

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Abstract

Hydrogen-assisted cracking is a critical combination of local microstructure, mechanical load and hydrogen concentration. Welded microstructures of low-alloyed creep-resistant Cr-Mo-V steels show different hydrogen trapping kinetics. This influences the adsorbed hydrogen concentration as well as the diffusion by moderate or strong trapping. A common approach to describe hydrogen traps is by their activation energy that is necessary to release hydrogen from the trap. In the present study, Cr-Mo-V steel T24 (7CrMoVTiB10-10) base material and TIG weld metal were investigated. Electrochemically hydrogen charged specimens were analyzed by thermal desorption analysis (TDA) with different linear heating rates. The results show two different effects. At first, the microstructure effect on trapping is evident in terms of higher hydrogen concentrations in the weld metal and increased activation energy for hydrogen release. Secondly, it is necessary to monitor the real specimen temperature. A comparison between the adjusted heating rate and the real specimen temperature shows that the calculated activation energy varies by factor two. Thus, the trap character in case of the base material changes to irreversible at decreased temperature. Hence, the effect of the experimental procedure must be considered as well if evaluating TDA results. Finally, realistic temperature assessment is mandatory for calculation of activation energy via TDA.

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Acknowledgements

The authors want to thank Mr. Klaus Scheideck and Mr. Michael Richter for the conduction of the weld experiments and machining the manifold specimens. Mrs. Stefanie Groth is thanked for her assistance in performing the electrochemical charging experiments.

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  1. Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205, Berlin, Germany

    Michael Rhode, Tobias Mente, Enrico Steppan, Joerg Steger & Thomas Kannengiesser

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Correspondence to Michael Rhode.

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Recommended for publication by Commission II - Arc welding and Filler Metals

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Rhode, M., Mente, T., Steppan, E. et al. Hydrogen trapping in T24 Cr-Mo-V steel weld joints—microstructure effect vs. experimental influence on activation energy for diffusion. Weld World 62, 277–287 (2018). https://doi.org/10.1007/s40194-017-0546-6

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