Abstract
The elastic properties of the single-crystal nickel-base superalloy CMSX-4 used as a blade material in gas turbines were investigated by the sonic resonance method in the temperature interval between room temperature and 1300 °C. Elastic constants at such high temperatures are needed to model the mechanical behavior of blade material during manufacturing (hot isostatic pressing) as well as during technical accidents which may happen in service (overheating). High reliability of the results was achieved using specimens of different crystallographic orientations, exciting various vibration modes as well as precise measurement of the material density and thermal expansion required for modeling the resonance frequencies by finite element method. Combining the results measured in this work and literature data the elastic constants of the γ- and γ′-phases were predicted. This prediction was supported by measurement of the temperature dependence of the γ′-fraction. All data obtained in this work are given in numerical or analytical forms and can be easily used for different scientific and engineering calculations.
Highlights
IntroductionModels of the last type have been developed to predict microstructural evolutions at high temperatures like rafting [6,7,9,10]
The excellent mechanical properties of nickel-base superalloys at high temperatures are provided by their two phase microstructure: The γ-solid solution of nickel strengthened by the γ0 -precipitates, a phase on the base of the intermetallic compound Ni3 Al
Combining the results of this work obtained with the results reported by Siebörger et al [16] for an alloy compositionally similar to the matrix of CMSX-4, the elastic constants of the γ-matrix cm ij over an entire temperature range were estimated
Summary
Models of the last type have been developed to predict microstructural evolutions at high temperatures like rafting [6,7,9,10] Both types of models require numerous material parameters, the first models at a macroscopic level, that is the parameters of a material as a whole, and the second models at a microscopic level, that is separately the parameters of the constituent γ- and γ0 -phases. This set of mechanical parameters includes the characteristics of elasticity, which in the case of cubic crystals of nickel-base superalloys is described by three elastic constants, usually by the elastic stiffnesses c11 , c12 , and c44
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