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Quantification of High Temperature Strength of Nickel-Based Superalloys

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Abstract:

The strength of nickel-based superalloys usually consists of solid solution strengthening from the gamma matrix and precipitation hardening due to the gamma' and/or gamma" precipitates. In the present work, a model was developed to calculate the high temperature strength of nickel-based superalloys, where the temperature dependence of each strengthening contribution was accounted for separately. The high temperature strength of these alloys is not only a function of microstructural changes in the material, but the result of a competition between two deformation modes, i.e. the normal low to mid temperature tensile deformation and deformation via a creep mode. Extensive validation had been carried out during the model development. Good agreement between calculated and experimental results has been achieved for a wide range of nickel-based superalloys, including solid solution alloys and precipitation-hardened alloys with different type/amount of precipitates. This model has been applied to two newly developed superalloys and is proved to be able to make predictions to within useful accuracy.

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Periodical:

Materials Science Forum (Volumes 546-549)

Pages:

1319-1326

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.546-549.1319

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Online since:

May 2007

Authors:

Zhan Li Guo, N. Saunders, Alfred Peter Miodownik, J.P. Schille

Keywords:

Creep, Modeling, Ni Superalloys, Precipitation Hardening, Strengthening

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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