Characterization of mechanical properties,fatigue-crack propagation,and residual stresses in a microalloyed pipeline-steel friction-stir weld |
| |
| Affiliation: | 1. National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA;2. National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD 20899, USA;3. Brazilian Nanotechnology National Laboratory, Caixa Postal 6192, Campinas, SP 13083-970, Brazil;1. ICB, UMR 6303 CNRS-Université Bourgogne Franche Comté, BP 47870, 21078 Dijon, France;2. CEA, DAM, Valduc, 21120 Is-sur-Tille, France;3. Laboratoire Interactions Matériau-Procédé-Environnement, LRC LIMPE, n° VA-11-02, France;1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China;3. Offshore Oil Engineering Co., Ltd, Tianjin 300450, China;1. Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02 507 Warsaw, Poland;2. Institute of Manufacturing Processes, Warsaw University of Technology, Narbutta 85, 02-524 Warsaw, Poland;3. Department of Friction and Resistance Welding and Environmental Engineering, Institute of Welding, Czeslawa 16/18, 44-100 Gliwice, Poland;4. Design, Manufacture and Engineering Management, University of Strathclyde, 75 Montrose Street, Glasgow G1 1XJ, United Kingdom |
| |
| Abstract: | The influence of the friction-stir welding process on microstructure and mechanical properties of API 5L X80 skelp was investigated. Friction-stir welds were produced using welding parameters optimized to promote weld toughness. The solid-state welding process produced microstructures that significantly varied from those observed in the base metal, namely the redistribution and resizing of Martensite–Austenite constituent in the heat-affected zone and stir zone regions of the welds. Mechanical properties of the welds and base metal were evaluated with uniaxial tension testing and microhardness testing revealing overmatching welds and a hard zone within the weld stir zone. Residual stresses were determined in several directions with respect to the joint revealing that stress in the longitudinal direction is highest, yet well below material yield strength. Fatigue-crack propagation behavior was characterized in the different weld regions and base metal by testing with the compact tension specimen configuration showing that welds have impeded fatigue-crack growth compared to the base metal mostly due to welding-induced residual stress fields interacting with the crack. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
