Effect of Structure on Creep Behaviour of Superalloy Single Crystals

Abstract:

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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:

Edited by:

Jaroslav Pokluda

Pages:

267-270

DOI:

10.4028/www.scientific.net/MSF.482.267

Citation:

P. Lukáš et al., "Effect of Structure on Creep Behaviour of Superalloy Single Crystals", Materials Science Forum, Vol. 482, pp. 267-270, 2005

Online since:

April 2005

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$35.00

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