Abstract
The purpose of the present work was to investigate the effect of cyclic loading at high temperature on the fracture toughness of a precipitate hardened alloy. A ..gamma..' precipitate hardened Inconcel X-750 alloy was chosen because of its importance in practical applications as well as its relatively well defined microstructure compared to other superalloys. This paper presents a study of the variation of the relative fracture toughness of this alloy during continuous and hold-time fatigue at 973/sup 0/K.
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