Mechanistic considerations for TMF life prediction of nickel-base superalloys

Abstract Typical gas turbine and jet engine hot-section components are subjected to severe environments along with variable thermal and mechanical loading histories. Nickel-base superalloys are often used in such applications because of their superior resistance to creep and strength at high temperatures. Most popular models for thermomechanical fatigue (TMF) life prediction are based on the creep-fatigue interactions exhibited by ductile metals and do not explicitly contain an environmental feature. Such models may be viewed as parametric damage approaches, in which the environmental effect is assumed to be incorporated in the time dependence of the formulation. In this paper, we briefly review some potential TMF life prediction models with special attention devoted to the consideration of oxidation effects for nickel-base superalloys.

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