A Study on Creep-Fatigue Interaction of Cobalt-Base Super Alloy X-40 at High Temperature : Especially, Effect of Strain Shapes on the Creep-Fatigue Interaction

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In the present study, the effect of strain-wave shapes on creep-fatigue interaction of a super alloy X-40 was studied by using four types of total strain range-controlled fatigue tests at 800℃ in atmosphere. The four types of the wave shapes were (a) push-pull continuous low-cycle fatigue test, (b) low-cycle fatigue test with tensile hold-time in each cycle, (c) low-cycle fatigue test with compressive hold-time in each cycle and (d) low-cycle fatigue test with tensile hold-time in every four cycles. Number of cycles to fracture of the alloy tested under strain wave (c) is larger than that of (b) and it is not far less than that of (a). The fracture life under strain wave (d) is nearly equal to that under the wave (b) in the total strain range of 1.0 per cent, but the former life is much greater than that of the latter one in the total strain range of 0.5 per cent.
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