Structural Analyses of Advanced Material for Aerospace Industry
Keywords:Ni – base superalloys, turbine blades, quantitative metallography, γ′ - phases
The Ni – base superalloys are used in aircraft industry for production of aero engine most stressed parts, as are turbine blades. From this reason a dendrite arm spacing, carbides size and distribution, morphology, number and value of γ′ - phase are very important structural characteristics for blade lifetime prediction as well as aero engine its self. In this article are used methods of quantitative metallography (software LUCIA for carbides evaluation, measuring of secondary dendrite arm spacing and coherent testing grid for γ′ - phase evaluation) for evaluation of structural characteristics mentioned above on experimental material Inconel IN 738. The high temperature effect and cooling rate on structural characteristics and application of quantitative methods evaluation are presented in this paper.
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