Phase stability of UDIMET@ alloy 720 (U720), a high strength, @ Registered Trademark of Special Metals Corporation

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A joint effort involving alloy producers, forgers, and users of vacuum melted nickel-base alloys under the auspices of ASM International has led to a common vocabulary for the different types of solute-lean defects found in superalloys; an improved understanding of their formation mechanisms, detection, and influence on mechanical properties has also been gained. These defects, more commonly known as white spots, have been classified into three types: discrete, dendritic, and solidification. Depending on factors such as size, chemistry, grain size, and the presence or absence of oxide/nitride clusters, discrete and dendritic white spots may be deleterious in highly stressed parts. Solidification white spots are generally not associated with non-metallic clusters and appear to have little effect on mechanical properties. However, additional low cycle fatigue results are needed, Proposed mechanisms of formation are different for each type of white spot.

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