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Effect of Structure on Creep Behaviour of Superalloy Single Crystals

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Abstract:

Creep behaviour of two types of superalloy single crystals of the orientation <001> was studied at 850 °C in air to assess their relative suitability for turbine blade applications: CMSX-4 and its potential low cost alternative, CM186LC. The chemical composition of these two superalloys is similar, their microstructure, especially g/g’ distribution, differs substantially. At the same applied stress, the time to failure of CM186LC is shorter than that of CMSX-4. Simultaneously, the creep rate of CM186LC is higher than that of CMSX-4 for the whole lifetime. This is attributed to easier activation of dislocation sources within large g’particles present in CM186LC crystals.

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Periodical:

Materials Science Forum (Volume 482)

Pages:

267-270

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.482.267

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Online since:

April 2005

Authors:

Petr Lukáš, Ludvík Kunz, Milan Svoboda, J. Čadek

Keywords:

Creep Behaviour, Dislocation Structure, Monkman-Grant Diagram, Superalloy CM186LC, Superalloy CMSX-4, γ/γ' Distribution

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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References

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