Author(s)

Z.L. Zhan & J. Tong

Abstract

The behaviour of creep-fatigue interaction of a new nickel-based superalloy has been described using the Chaboche unified model. Simple cyclic and dwell experiments have been carried out at three strain rates at 650oC. The optimised material parameters have been determined by a simultaneous numerical (nonlinear least-square) approach as well as a step-by-step procedure using basic material data, and applied to dwell tests. The predictive capability of the Chaboche model for this alloy will be evaluated. Keywords: unified constitutive models, parameter determination, non-liner leastsquare optimisation, creep-fatigue interaction, nickel-based superalloy. 1 Introduction A new nickel-based superalloy has been developed at Rolls Royces plc via a power metallurgy route for turbine disc application. The alloy is solution tre

Keywords