TY - CONF A1 - Griesche, Axel A1 - Altenkirch, J. A1 - Gibmeier, J. A1 - Beyer, Katrin A1 - Kromm, Arne A1 - Kannengießer, Thomas T1 - Welding problems - Investigations with neutrons of residual stress and of hydrogen diffusion in steels T2 - ESS Workshop "Science Vision for the European Spallation Source - German Perspectives" N2 - We report about investigations of typical material problems in steels. First, residual stresses in and around weld seams with low martensite transition temperature filler material were analyzed w/ and w/o additional transverse tensile load. The investigation was accompanied by x-ray diffraction measurements to track stress-induced phase transitions. Martensite formation during welding under external load yield strain gradients near the surface that improve the integrity of the weld. Further, the residual stress distribution close to laser-treated steel surfaces was analyzed. The method could be improved to reduce analysis artifacts. Finally, hydrogen diffusion in different steels was measured using neutron radiography and subsequent image analysis. Diffusion coefficients were derived by analyzing the time-dependent mass flux. In an outlook we describe the optimal ESS instrumentation from a metallurgist’s point of view. T2 - ESS Workshop "Science Vision for the European Spallation Source - German Perspectives" CY - Bad Reichenhall, Germany DA - 2011-10-10 PY - 2011 UR - http://www.fz-juelich.de/cae/servlet/contentblob/1058986/publicationFile/24649/Griesche_pdf.pdf UR - http://www.fz-juelich.de/sid_BD693DF17F42B3018726EE5C2558C56C/jcns/EN/Leistungen/ConferencesAndWorkshops/ESS/_node.html AN - OPUS4-24464 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -