Abstract
The Ni base directionally solidified super-alloy has been developed as a gas turbine blade material for high electrical efficiency power plant. Since turbine blades are faced with the centrifugal stress from the high-speed rotation, it is used under the high temperature creep condition. On the other hand, it is used under periodical condition caused by combustion gas. Therefore, the Ni base directionally solidified super-alloys are operated under the condition of high temperature creep-fatigue interaction. In this paper, high temperature crack growth tests were conducted under the condition of creep-fatigue interaction for the Ni base directionally solidified super-alloy, CM247LC. Based on the non-equilibrium science, crack growth mechanisms were investigated by analyzing the effects of cycle dependent and time dependent mechanisms on the crack growth behaviors under the condition of creep-fatigue interaction. Furthermore, the law-of crack growth life under the conditions of creep-fatigue interaction was derived.
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