TY - GEN A1 - Mente, Tobias A1 - Böllinghaus, Thomas A2 - Udomkichdecha, W. A2 - Mononukul, A. A2 - Böllinghaus, Thomas A2 - Lexow, Jürgen T1 - Numerical investigations on hydrogen-assisted cracking (HAC) in duplex stainless steels T2 - Materials for energy infrastructure N2 - Duplex stainless steels have been used for a long time in the offshore industry, since they have higher strength than conventional austenitic stainless steels and they exhibit a better ductility as well as an improved corrosion resistance in harsh environments compared to ferritic stainless steels. However, despite these good properties the literature shows some failure cases of duplex stainless steels in which hydrogen plays a crucial role for the cause of the damage. Numerical simulations can give a significant contribution in clarifying the damage mechanisms. Therefore, a numerical model of a duplex stainless steel microstructure was developed enabling simulation of crack initiation and propagation in both phases. The phase specific stress strain analysis revealed that local plastic deformation occurs in both austenite and δ-ferrite already in the macroscopically elastic range. Altogether, phase specific hydrogen-assisted material damage was simulated for the first time taking into account all main factors influencing hydrogen assisted cracking process. The results agree well with experimental observations and thus allow a better insight in the mechanism of hydrogen-assisted material damage. PB - Springer T2 - 4th WMRIF Young scientists workshop CY - Boulder, CO, USA DA - 2014-09-08 KW - Hydrogen-assisted cracking (HAC) KW - Numerical simulation KW - FEM KW - Duplex stainless steel (DSS) KW - Mesoscale model PY - 2016 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/35075 AN - OPUS4-35075 SN - 978-981-287-723-9 SN - 978-981-287-724-6 SP - 21 EP - 31 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany