TY - JOUR A1 - Pinto, H. A1 - Pyzalla, A.R. A1 - Büscher, R. A1 - Fischer, A. A1 - Aßmus, Kristin A1 - Hübner, Wolfgang T1 - The effect of hydrogen on the deterioration of austenitic steels during wear at cryogenic temperature JF - Wear N2 - Hydrogen represents an important alternative to fossil fuels. Hydrogen storage is possible as a gas, at room temperature (RT) at about 20 MPa pressure, and in a liquefied form, at cryogenic temperatures of about 20 K. The latter form is particularly attractive due to the possibility of stocking a large quantity of hydrogen within a small volume. In moving parts (e.g. of transport vehicles) cryogenic temperature and the presence of hydrogen strongly enhance wear processes and subsequently component failure. The present work deals with the deformation behaviour and the microstructural deterioration of austenitic CrNi- and CrMn high nitrogen-steels during friction in liquid hydrogen at 20 K. The modified microstructure within the wear scar is studied by scanning electron microscopy and X-ray diffraction methods. Diffraction studies of wear scars reveal the importance of twinning during deformation at 20 K. This increase of twinning can be attributed to a hydrogen-induced reduction of stacking fault energy (SFE) in the austenitic steels. Interactions between twin boundaries and planar dislocation structures along with locally increased stresses led to the formation of extensive crack networks. The amount of hydrogen-induced surface cracks depends on the alloy composition and is not necessarily correlated to the wear resistance of the austenitic steels. KW - Austenitic steel KW - Stacking fault energy KW - Hydrogen KW - Wear KW - Cryotechnology PY - 2005 DO - https://doi.org/10.1016/j.wear.2005.02.057 SN - 0043-1648 VL - 259 IS - 1-6 SP - 424 EP - 431 PB - Elsevier CY - Amsterdam AN - OPUS4-7692 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Pinto, H. A1 - Pyzalla, A.R. A1 - Hübner, Wolfgang A1 - Aßmus, Kristin T1 - Influence of Environment, Temperature and Chemical Composition on the Microstructural Deterioration of CrNi Steels during Friction JF - Materialwissenschaft und Werkstofftechnik = Materials science and engineering technology KW - CrNi steel KW - Stacking fault energy KW - Phase transformation KW - Friction KW - Cryotechnology PY - 2004 SN - 0933-5137 SN - 1521-4052 VL - 35 IS - 10/11 SP - 716 EP - 721 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-6867 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -