Abstract
Large and reliable components by wrought γ′ strengthened Ni and Ni-Fe based superalloy are strongly demanded for advanced ultra-supercritical (A-USC) power generation, which is one of the most promising and efficient technologies with steam temperature of above 700 °C. In this work, the effect of phosphorus on the creep properties and microstructure change of wrought γ′ strengthened Ni-based superalloy (alloy 282 ), was investigated, focused on the effects of carbides precipitation . In an alloy with phosphorus content of 8 ppm, precipitation of M23C6 carbides was observed in both grain boundaries and grain interior prior to the creep tests. Grain boundary coverage by carbide increased until the phosphorus content up to about 30 ppm. On the other hand, the amount of M23C6 in grain interior decreased with increasing phosphorus content. Results of the creep tests revealed the relationship between the time to rupture and the grain boundary coverage by carbide . Microstructure of the crept specimen showed the existence of misorientation at the vicinity of grain boundary without carbides by means of an electron backscattered diffraction (EBSD ) analysis. These results suggest that the improvement of the time to rupture is due to the grain boundary precipitation strengthening mechanism by grain boundary carbides and phosphorus content affects precipitation behavior of M23C6 carbides in grain interior and grain boundaries .
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Hasebe, Y., Yoshida, M., Maeda, E., Ohsaki, S. (2018). Effects of Phosphorus Addition on Creep Properties of Wrought γ′ Strengthened Ni-Based Superalloy. In: Ott, E., et al. Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-89480-5_34
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DOI: https://doi.org/10.1007/978-3-319-89480-5_34
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