Creep degradation of an IN738C superalloy after long-term thermal exposure in an atmospheric furnace was investigated by means of accelerated creep tests. Experimental observation showed that the minimum creep rate increased by increasing the exposure time or exposure temperature and is a key factor for predicting creep life during long time, high temperature service. Concerning the exposure temperature and time, an empirical equation has been presented to estimate the creep lives of the pre-exposed specimens. Furthermore, the accuracy of the Monkman–Grant (Proceedings of ASTM, Vol. 56, pp. 593–620) relationship has been verified by experimental results.
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. 0309-1740Copyright © 2009
by American Society of Mechanical Engineers
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