TY - CONF A1 - Mayr, P. A1 - Rhode, Michael A1 - Richter, Tim A1 - Nitsche, A. T1 - Hydrogen diffusion in creep-resistant 9%-Cr steel welds N2 - 9 %-Cr steels like P91 and P92 are widely used in power plants due to the excellent creep-resistance. Components of this steel are typically welded and demand for careful welding fabrication, whereas a so-called post weld heat treatment (PWHT), must be conducted to increase the toughness and decrease the hardness of the martensitic as-welded (AW) microstructure. Before the PWHT, a hydrogen removal (or dehydrogenation) heat treatment is necessary as hardened AW martensitic microstructure is generally prone to delayed hydrogen assisted cracking (HAC). The microstructure and temperature dependent hydrogen diffusion is an important issue as it determines how long a potential crack-critical hydrogen concentration could remain in the microstructure. In this context, reliable hydrogen diffusion coefficients of P91 and P92 weld metal are rare. T2 - IIW Intermediate Meeting, Commission IX-C "Creep and heat resistant welds" CY - Miami, FL, USA DA - 12.03.2019 KW - Hydrogen KW - Diffusion KW - Weld metal KW - Creep-resistant steel PY - 2019 AN - OPUS4-48450 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -