TY - CONF A1 - Schaupp, Thomas A1 - Yahyaoui, Hamza A1 - Rhode, Michael A1 - Kannengießer, Thomas T1 - Effect of weld penetration depth on hydrogen-assisted cracking of high-strength structural steels N2 - The need for steels with highest mechanical properties is a result of the increasing demands for energy and resource efficiency. In this context, high-strength structural (HSS) steels are used in machine, steel and crane construction with yield strength up to 960 MPa. However, welding of HSS steels requires profound knowledge of three factors in terms of avoidance of hydrogen-assisted cracking (HAC): the interaction of (1) microstructure, (2) local stress/strain and (3) local hydrogen concentration. In addition to the three main factors, the used weld-arc process is also important for the performance of the welded joint, especially when using modern arc variants. In the past, the conventional transitional arc process (Conv. A) was mainly used for welding of HSS grades. In the past decade, the so-called modified spray arc process (Mod. SA) has been used increasingly for welding production. This modified process enables reduced seam opening angles with increased deposition rates compared to the conventional process. Economic benefits of using this arc type are: a reduced number of necessary weld beads and a lower weld seam volume, which result in decreased total welding time and costs. Nonetheless, investigations on a high-strength S960QL showed significantly higher hydrogen concentrations in the weld metal at a reduced seam opening angle with Mod. SA. This indicates an increased susceptibility of the welded component to HAC. Hence, existing recommendations on HAC-avoidance cannot be transferred directly to the Mod. SA-process. In the present study, the susceptibility to HAC of the HSS steel S960QL with same type of filler material was investigated. For that purpose, both Conv. A and Mod. SA were used with same heat input at different deposition rates. For assessment of the HAC susceptibility, the externally loaded implant test was used. Both conducted test series with Conv. A and Mod. SA showed similar crack critical stress of about 280 MPa. Below this value, no delayed fracture appeared. The welds with Mod. SA showed higher hydrogen concentrations. The fracture occurred in the heat-affected zone (HAZ) or in the weld metal (WM). However, the test series with Mod. SA showed a significant extension of the time to failure of several hours compared to tests carried out with Conv. A. T2 - 72nd IIW Annual Assembly and International Conference: Commission II-A CY - Bratislava, Slovakia DA - 07.07.2019 KW - Hydrogen KW - Implant test KW - High-strength steels KW - Fractography PY - 2019 AN - OPUS4-48462 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schlegel, Moritz-Caspar T1 - Nano-porous Materials - Introduction into Metal-organic Frameworks N2 - Metallic organic frameworks are the materials stirring great interest by their large variety of structure types and chemical composition as well as low density and very high surface area, which are desirable properties for gas storage such as for hydrogen, methane or carbon dioxide. Using different so called secondary building units offer an opportunity to form tunable structures with channels of various geometry and allow in this way to study the absorption of the molecular hydrogen, methane or carbon dioxid in the systematic way. T2 - Neutron Scattering Application to Hydrogen Storage Materials CY - Berlin, Germany DA - 07.08.2017 KW - MOFs KW - Hydrogen KW - Crystallography PY - 2017 AN - OPUS4-41285 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schulze, Uwe T1 - Measurement of permeation of hydrogen on hoses according to ISO 3821 N2 - The subject of permeation of hoses according to ISO 3821 for hydrogen was discussed for a long time in ISO/TC 44/SC 8. The reason is a considerable leakage of hydrogen diffused into the hose material over the end face of the hose. Because of this unsolved, safety-related problem of hoses sold on the market, measurements should be carried out in order to be able to better assess the problem. BAM has declared its attendance to provide a required fast solution to this issue. T2 - Meeting of the committee ISO/TC 44/SC 8 "Equipment for gas welding, cutting and allied processes" CY - Genoa, Italy DA - 08.11.2023 KW - Permeation KW - Hoses KW - Hydrogen KW - Leakage KW - ISO 3821 PY - 2023 VL - 2023 AN - OPUS4-59375 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Seifert, Lando A1 - Müller, Thoralf A1 - Ebell, Gino T1 - Committee Meeting to WIPANO "Safety of Prestressing Steels" N2 - A conclusion on the WIPANO research project "Safety of Prestressing Steel" was presented in the final committee meeting at the end of the project. The project's exciting findings and recommendations for a new method were discussed with the audience of national and international stakeholders of the prestressing steel industry and representatives of inspection bodies and standardization. T2 - Committee Meeting to WIPANO research Project CY - Online meeting DA - 29.09.2022 KW - ISO 15630-3 KW - Prestressing Steels KW - Hydrogen-induced Stress Corrosion Cracking KW - Hydrogen PY - 2022 AN - OPUS4-56101 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Seifert, Lando A1 - Müller, Thoralf A1 - Ebell, Gino T1 - Safety of Prestressing Steels N2 - This talk reports the findings of the WIPANO "Knowledge and Technology Transfer via Patents and Standards" research project "Safety of Prestressing Steels," founded by the German Ministry of Economic Affairs and Climate Action (BMWK). A new test method for assessing the susceptibility of prestressing steels to hydrogen-induced stress corrosion cracking (SCC) is presented, which serves the demands of a lower scattering compared with the present standard. Moreover, the ability to differentiate between high susceptible and low susceptible prestressed wires is possible, modifying the method by hydrogen charging and surface preparation. T2 - Konferenz EUROCORR 2022 CY - Berlin, Germany DA - 28.08.2022 KW - ISO 15630-3 KW - Stress Corrosion Cracking KW - Prestressing Steels KW - Hydrogen KW - Constant Load Test PY - 2022 AN - OPUS4-55661 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Souza Filho, I. A1 - Adam, Christian T1 - Fundamentals of the hydrogen plasma reduction of iron ores N2 - Hydrogen plasma treatment of iron ores or iron oxide containing wastes can be an efficient option to produce green iron e.g. for steel production. This way iron oxide is reduced to metallic iron in the liquid form by the highly reactive species that are formed in a hydrogen plasma. Hydrogen plasma can be used at the same time to remove undesired gangue elements. The presentation shows the experimental setup, shows first results of iron ore reduction by hydrogen plasma and gives an outlook for industrial application of the technology. T2 - European Academic Symposium on EAF steelmaking (EASES 2023) CY - Oulu, Finland DA - 05.06.2023 KW - Hydrogen KW - Plasma KW - Reduction PY - 2023 AN - OPUS4-57626 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Theiler, Geraldine T1 - Tribology of polymer materials in hydrogen N2 - The polymer chemical structure of the polyimide has a major influence on the tribological behaviour. The addition of graphite in PI2 has a beneficial effect in hydrogen on the friction and wear. The low friction of graphite is associated with a lubricant film in hydrogen. The influence of hydrogen on graphite is more effective than humidity. CNTs have a similar effect to that of graphite in PEEK composites. TiO2 particles improve significantly the wear rate both in vacuum and hydrogen environment. In LH2 friction and wear decrease for unfilled polymers. Friction of graphite filled composites increases slightly and wear rate is stable. T2 - 10. International Hydrogen Energy Development Forum 2016 / 2016 HYDROGENIUS & I2CNER Tribology Symposium CY - Fukuoka, Japan DA - 04.02.2016 KW - Hydrogen KW - Tribology KW - Polymer materials KW - Cryogenic temperature KW - CNT KW - TiO2 KW - PEEK PY - 2016 AN - OPUS4-35641 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Theiler, Géraldine T1 - Sliding behaviour of polymer materials in hydrogen N2 - This lecture deals with the sliding behaviour of polymer materials in hydrogen environment. After a short introduction of the hydrogen activities at BAM, the tribological performances of polymer materials in gaseous hydrogen are presented and compared with air and vacuum environment. The second part focusses on the influence of the counterface materials in hydrogen. Finally, the last section is dedicated to experiments liquid hydrogen. T2 - Invited lecture, TRIBOS+ program at Lulea University of Technology CY - Lulea, Sweden DA - 30.06.2021 KW - Polymers KW - Hydrogen KW - Friction KW - Wear PY - 2021 AN - OPUS4-53708 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Theiler, Géraldine A1 - Gradt, Thomas T1 - Benchmarking of polymer materials for tribological applications in hydrogen N2 - The focus of this study is to evaluate of hydrogen on the friction and wear behavior of a wide range of polymer materials. Thereby, the tribological performance of filled and unfilled polymers from different suppliers were compared at room temperature in air and hydrogen gas (H2) as well as in liquid hydrogen at -253°C (LH2). T2 - 62. Tribologie-Fachtagung der Gesellschaft für Tribologie e. V. CY - Online meeting DA - 27.09.2021 KW - Polymers KW - Hydrogen KW - Friction KW - Wear PY - 2021 AN - OPUS4-53700 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Theiler, Géraldine A1 - Gradt, Thomas T1 - Tribology of polymeric materials in gaseous and liquid hydrogen N2 - This presentation gives an overview of the tribological behaviour of polymeric materials in gaseous and luquid hydrogen. T2 - HYDROGENIUS-BAM Joint Hydrogen Symposium CY - Online meeting DA - 06.07.2021 KW - Polymers KW - Hydrogen KW - Friction KW - Wear PY - 2021 AN - OPUS4-53701 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -