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The fatigue crack growth behavior of forged turbine disc of IN 718 superalloy in radial and tangential direction has been studied in air at 650°C at two frequencies, 1Hz and 0.1Hz at a stress ratio of 0.1. The alloy shows a strong frequency and directionality effect. In both the directions, the forged turbine disc of IN 718 superalloy exhibits higher crack growth rate at 0.1Hz as compared to that...
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