Correlation between grain boundary misorientation and M23C6 precipitation behaviors in a wrought Ni-based superalloy |
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| Affiliation: | 1. 127 Youyi Xilu, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;2. 5 South Jinhua Road, School of Material Science and Engineering, Xi''an University of Technology, Xi''an, Shaanxi 710048, China;1. State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, PR China;2. China First Heavy Industries, Tianjin 300457, PR China;3. Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, PR China;1. Peking University, Beijing 100871, China;2. Shenzhen Institute, Peking University, Shenzhen 518057, China;3. Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016,China;1. Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, 100124 Beijing, China;2. State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, 310058 Hangzhou, China;3. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, China;4. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan 250061, China;5. School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, WA 6009, Australia |
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| Abstract: | The correlation between the grain boundary misorientation and the precipitation behaviors of intergranular M23C6 carbides in a wrought Ni–Cr–W superalloy was investigated by using the electron backscattered diffraction (EBSD) technique. It was observed that the grain boundaries with a misorientation angle less than 20°, as well as all coincidence site lattice (CSL) boundaries, are immune to precipitation of the M23C6 carbides; in contrast, the random high-angle grain boundaries with a misorientation angle of 20°–40° provide preferential precipitation sites of the M23C6 carbides at the random high-angle grain boundaries with a higher misorientation angle of 55°–60°/[2 2 3] turn to retard precipitation of M23C6 carbides owing to their nature like the Σ3 grain boundaries and retard the precipitation of M23C6 carbides. The low-angle and certain random grain boundary segments induced by twins were found to interrupt the precipitation of the M23C6 carbides along the high-angle grain boundaries. |
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