Abstract
A long term aging treatment at 900 °C for 3000 h was carried out on a heat treated conventional cast nickel base superalloy. The evolution of grain boundary (GB) morphologies was observed using OM and SEM respectively. It was found that the irregular serrated GBs, initially composed by discontinuously distributed MC carbide and γ′ phases, were coarsening with aging time and the coarsening ratio of the MC was higher than that of γ′ phase. MC carbides were gradually decomposed into M6C carbide and ŋ phase, while γ′ particles were coalesced along the GB direction and formed γ′ bands after 1000h. A Johnson-Mehl-Avrami-Kolmogorov (JMAK) type of function was employed to quantify the evolution of coarsening behaviors of the carbide and γ′ phases part in serrated GBs respectively. The good agreement between calculated results and experimental data indicated that the serrated GBs were indeed evolved as a JMAK type of function.
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Zeng, Q., Zhao, M., Yan, P., Li, J., Zhao, J., Zhang, L. (2013). Coarsening Kinetics of Grain Boundary in a Cast Nickel Base Superalloy During Long Term Aging. In: Marquis, F. (eds) Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing. Springer, Cham. https://doi.org/10.1007/978-3-319-48764-9_39
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DOI: https://doi.org/10.1007/978-3-319-48764-9_39
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