Microstructures and mechanical properties of creep resistant steel for application at elevated temperatures |
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| Affiliation: | 1. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia;2. Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia;3. Military Technical Institute, Ratka Resanovi?a 1, 11030 Belgrade, Serbia;4. Instituto de Soldadura e Qualidade ISQ, Taguspark-Oeiras, Av. Prof. Dr. Cavaco Silva 33, 2740-120 Porto Salvo, Portugal;5. Innovation Center, Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120 Belgrade, Serbia;1. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, PR China;2. Jiangsu Frontier Electric Technology Co. Ltd., Nanjing 211102, PR China;3. Research Institute of Wuhan Iron and Steel (Group) Corp., Wuhan 430080, PR China;4. Dongfang Boiler Group Co. Ltd., Zigong 643000, PR China |
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| Abstract: | The subject of this paper is the microstructural and mechanical characterisation of regions of the heat-affected zone (HAZ) in steels containing 9–12% Cr that are used for operation at elevated temperatures. Tests were performed on regions in the HAZ, which was created by physical simulation using a thermal welding simulator. Half of the simulated samples (SSs) were tested at room temperature (RT) and at an operating temperature (OT) of 600 °C immediately after simulation/welding, while the rest of the simulated samples were tested at RT and at the OT after heat treatment following the welding, i.e., post-weld heat treatment (PWHT). In addition to the results from mechanical testing, the results from microstructural analysis using light microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are also presented. The manner in which PWHT contributes to the creep resistance of the HAZ in P91 steel is demonstrated. |
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