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A series of critical experiments was performed on single crystal CMSX-3 and equiaxed grain Mar-M246 specimens to identify the mechanisms responsible for the degradation in stress-rupture properties of 0.020 in. thick mini-flats machined from airfoils compared with 0.250 in. diameter standard test bars.Both materials exhibited approximately a factor of 3X life degradation at a stress level of 20,000 lb/in.2, when uncoated airfoil mini-flats were tested in air.

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