High-temperature tensile and creep deformation of cross-weld specimens of weld joint between T92 martensitic and Super304H austenitic steels |
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| Affiliation: | 1. High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea;2. Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea;3. Laboratoire d''Etude des Microstructures et de Mécanique des Matériaux, CNRS UMR 7239, Université de Lorraine, 57000 Metz, France;4. Green Energy Laboratory, KEPCO Research Institute, Daejeon 305-760, Republic of Korea;1. Faculté de Physique, Université des Sciences et de la Technologie Houari Boumediene, Bab Ezzouar, BP32, El Alia, Alger, Algeria;2. Université Paris-Sud, ICMMO, UMR CNRS 8182, 91405 Cedex Orsay, France;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;2. School of Aeronautics and Astronautics, Central South University, Changsha 410083, PR China;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;3. Fracture and Reliability Research Institute, School of Engineering, Tohoku University, Sendai 9808579, Japan;1. Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Paulínska 16, 917 24 Trnava, Slovakia;2. Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, D-22607 Hamburg, Germany;3. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, v.v.i., ?i?kova 22, 616 62 Brno, Czech Republic |
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| Abstract: | The high-temperature mechanical behavior of cross-weld specimens prepared from a dissimilar weld joint between T92 martensitic and Super304H austenitic heat-resistant steels incorporating Ni-based weld metal was evaluated at temperatures up to 650 °C. For both high temperature tensile and creep tests, failure took place in T92 due to its faster degradation with temperature increase. The heat-affected zone of T92 played a critical role during creep deformation, resulting in type IV failure under the long-term creep condition. For the creep specimens, the location of failure shifted from the base metal region to the fine-grained heat-affected zone as the creep duration time increased from the short-term to the long-term condition. The massive precipitation of Laves phase on the grain boundaries of the fine-grained heat-affected zone during creep deformation was observed and found to be responsible for the accelerated void formation in the area leading to the premature failure. |
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