Effect of the pre-existing carbides on the grain boundary network during grain boundary engineering in a nickel based alloy |
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| Affiliation: | 1. Institute of Materials, Shanghai University, Shanghai 200072, China;2. Key Laboratory for Microstructures, Shanghai University, Shanghai 200444, China;1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, 721302, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, 600036, India;3. Systron EMV GmbH, Neue Gasse 4, Schwabach 91126, Germany |
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| Abstract: | Grain boundary engineering was carried out on an aging-treated nickel based Alloy 690, which has precipitated carbides at grain boundaries. Electron backscatter diffraction technique was used to investigate the grain boundary networks. Results show that, compared with the solution-annealed samples, the aging-treated samples with pre-existing carbides at grain boundaries need longer duration or higher temperature during annealing after low-strain tensile deformation for forming high proportion of low-Σ coincidence site lattice grain boundaries (more than 75%). The reason is that the primary recrystallization is inhibited or retarded owing to that the pre-existing carbides are barriers to grain boundaries migration. |
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