School of Materials Science and Engineering, Beihang University
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DOI:
10.7502/j.issn.1674-3962.2015.05.08
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Abstract:
With high melting point, low density, and good high-temperature strength and processability, ultra high temperature Nb-Si intermetallic based superalloys are considered as the most promising materials for replacing the third generation of monocrystal Ni-based superalloys. This paper introduced a series of results regarding typical microstructure characteristics, alloys’ compositions optimization, microstructural control, and roles of constituent phases for Nb-Si based superalloys. Recently, some property, such as room-temperature fracture toughness, high-temperature strength, and oxidation resistance, has met the application requirements of turbine airfoil materials. However, there is still a gap between the current comprehensive properties and application requirements. In the future, based on the optimization of alloy design, how to develop a more available process for microstructural control to achieve a comprehensive combination of room-temperature fracture toughness, high-temperature strength, and oxidation resistance, is important for the development of ultra high temperature Nb-Si intermetallic based superalloys.