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S. Zamberger, P. Lang, G. Klösch, J. Klarner, G. Mori, E. Kozeschnik:
"Long-range diffusion of H in the presence of traps in a microalloyed steel";
Talk: OPTIMOM 2014, Pembroke College Oxford; 2014-09-14 - 2014-09-16.

The oil industry is more and more forced to exploit sour oil reservoirs and gas fields that contain increasing amounts of H2S. With that, the steel industry is forced to develop steels, which are resistant against stress corrosion cracking with at least the same strength level and, in future, with even higher strength. An important feature related to stress corrosion cracking is the trapping of hydrogen atoms at localized trapping sites inside the material. In the present work, we investigate the trapping of hydrogen in microalloyed steels at substitutional solute atoms as well as second-phase precipitates. With the help of the numerical simulation, the trapping efficiency of alloying elements in solution and in precipitates is evaluated and compared to results of permeation tests. Finally, we demonstrate the influence of different martensite tempering treatments on hydrogen trapping and the hydrogen loading and permeation kinetics.