PSI - Issue 13

A. Laureys et al. / Procedia Structural Integrity 13 (2018) 1330–1335 Author name / Structural Integrity Procedia 00 (2018) 000–000

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microstructural features than hydrogen induced damage. While there is still further verification needed by detailed microstructural analysis to identify those traps, the performed tests clearly demonstrate that no peak from the hydrogen induced damage was detectable by TDS for the current testing conditions. The internal cracks formed close to the surface, which are linked to blisters, propagate towards the surface to release the internal pressure by hydrogen gas release (Griesche et al. (2014)). Therefore, the hydrogen responsible for blister formation could already have left the material before the start of the TDS measurement. Alternatively, it might also be that some H 2 trapped in the material did not dissociate upon heating in the TDS and is still trapped inside the material at the maximal TDS temperature. 4. Conclusions The present study investigated the possibility of using melt extraction and thermal desorption spectroscopy to observe hydrogen induced damage. Application of multiple test conditions on cold deformed ULC steel with and without the presence of hydrogen induced damage illustrated that the detection of hydrogen induced damage for the current test conditions was not successful. Hydrogen could already have exited the material prior to analysis, due to pressure release of internal cracks at the surface. Additionally, the presence of the second peak during melt extraction and the two remaining peaks after 48 h of rest by TDS seem to be rather related to microstructural features induced. Further evaluation is required to confirm these hypotheses. Acknowledgements The authors wish to thank the Agency for Innovation by Science and Technology in Flanders (IWT) for support (Project no. SB141399), the postdoctoral fellowship via grant nr BOF01P03516 and the Special Research Fund (BOF), UGent (BOF15/BAS/06). References De Bruycker, E., De Vroey, S., Huysmans, S., Stubbe, J., 2014. Phenomenology of hydrogen flaking in nuclear reactor pressure vessels, Materials Testing 56, 439-444. Depover, T., Verbeken, K., 2016. The effect of TiC on the hydrogen induced ductility loss and trapping behavior of Fe-C-Ti alloys, Corrosion Science 112, 308-326. Depover, T., Verbeken, K., 2016. Evaluation of the effect of V4C3 precipitates on the hydrogen induced mechanical degradation in Fe-C-V alloys, Materials Science and Engineering 675, 299-313. Depover, T., Verbeken, K., 2018. The detrimental effect of hydrogen at dislocations on the hydrogen embrittlement susceptibility of Fe-C-X alloys: An experimental proof of the HELP mechanism, International Journal of Hydrogen Energy 43, 3050-3061. Dong, C.F., Liu, Z.Y., Li, X.G., Cheng Y.F., 2009. Effects of hydrogen-charging on the susceptibility of X100 pipeline steel to hydrogen-induced cracking, International Journal of Hydrogen Energy 34, 9879–9884. A. Griesche, A., Dabah, E., Kannengiesser, T., Kardjilov, N., Hilger, A., Manke, I., 2014. Three-dimensional imaging of hydrogen blister in iron with neutron tomography, Acta Materialia 78, 14-22. Jin, T.Y., Liu, Z.Y., Cheng, Y.F., 2010. Effect of non-metallic inclusions on hydrogen-induced cracking of API5L X100 steel, International Journal of Hydrogen Energy 35, 8014-8021. Kumnick, A.J., Johnson, H.H., 1980. Deep trapping states for hydrogen in deformed iron, Acta Metallurgica 28 (1980) 33-39. Lee, J.L., Lee, J.Y., 1987. The effect of lattice defects induced by cathodic hydrogen charging on the apparent diffusivity of hydrogen in pure iron, Journal of Materials Science 22, 3939-3948. Laureys A. , Van den Eeckhout, E., Petrov, R., Verbeken, K., 2017. Effect of deformation and charging conditions on crack and blister formation during electrochemical hydrogen charging, Acta Mat 127, 192-202. Laureys, A., Depover, T., Petrov, R., Verbeken, K., 2016. Microstructural characterization of hydrogen induced cracking in TRIP-assisted steel by EBSD, Materials Characterization 112, 169-179. Laureys, A., Depover, T., Petrov, R., Verbeken, K., 2015. Characterization of hydrogen induced cracking in TRIP-assisted steel, International Journal of Hydrogen Energy 40, 16977-16984. Pérez Escobar, D., Miñambres, C., Duprez, L., Verbeken, K., Verhaege, M., 2011. Internal and surface damage of multiphase steels and pure iron after electrochemical hydrogen charging, Corrosion Science 53, 3166-3176. Tetelman, A.S., Robertson, W.D., 1963. Direct observation and analysis of crack propagation in iron-3% silicon single crystals, Acta Metallurgica 11, 415-426. Zapffe, C., Sims, C., 1941. Hydrogen embrittlement, internal stress and defects in steel, TMS-AIME 145, 225-232.