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Topologically Close-Packed Phase Precipitation in Ni-Based Superalloys

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Abstract:

The addition of refractory elements is effective in improving the comprehensive performance of Ni-based superalloys, and meanwhile, the precipitation trend of TCP phases increases with the elements content due to the segregation of refractory elements during high temperature service. The precipitation of TCP phases obviously decreased the creep properties and creep rupture life of superalloys. The toughness and plastic of superalloys also dramatically deteriorated. The addition of Ruthenium (Ru) is shown to suppress the formation of TCP phases in Ni-based superalloys, resulting in much improved the creep resistance and the microstructural stability. The studies on TCP phases in Ni-based superalloys including crystallography and precipitation of TCP phases and the effect of alloy composition on TCP phases are reviewed.

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Periodical:

Advanced Materials Research (Volume 320)

Pages:

26-32

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.320.26

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Online since:

August 2011

Authors:

Fei Sun, Jian Xin Zhang

Keywords:

Refractory Elements, Ruthenium (Ru), Segregation, Superalloy, TCP Phases

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