Abstract
Ni-Fe-base superalloys due to their good manufacturability and low cost are the proper candidates for boiler materials in advanced power plants. The major concerns with Ni-Fe-base superalloys are the insufficient mechanical properties at elevated temperatures. In this paper, tensile properties, deformation, and fracture characteristics of a Ni-Fe-base superalloy primarily strengthened by γ′ precipitates have been investigated from room temperature to 1073 K (800 °C). The results showed a gradual decrease in the strength up to about 973 K (700 °C) followed by a rapid drop above this temperature and a ductility minimum at around 973 K (700 °C). The fracture surfaces were studied using scanning electron microscopy and the deformation mechanisms were determined by the observation of deformed microstructures using transmission electron microscopy. An attempt has been made to correlate the tensile properties and fracture characteristics at different temperatures with the observed deformation mechanisms.
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The authors thank Mr. T. Hibaru, Mr. H. Kuroda, and Mr. Y. Taniuchi (National Institute for Materials Science, Japan) for alloy fabrication for this study.
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Zhong, Z., Gu, Y., Yuan, Y. et al. Tensile Properties and Deformation Characteristics of a Ni-Fe-Base Superalloy for Steam Boiler Applications. Metall Mater Trans A 45, 343–350 (2014). https://doi.org/10.1007/s11661-013-1959-5
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DOI: https://doi.org/10.1007/s11661-013-1959-5