Fatigue Properties of Hot Dip Aluminized Inconel 718 Superalloy


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Gökdemir I., Kaba M., Balcı E., Kavukcu A., Baydoğan M.

Presentation, pp.250-253, 2022

  • Publication Type: Other Publication / Presentation
  • Publication Date: 2022
  • Page Numbers: pp.250-253
  • Istanbul Technical University Affiliated: Yes

Abstract

Hot dip aluminizing (HDA) is a diffusion based surface treatment applied to various metals to improve their oxidation and corrosion resistance due to the formation of aluminide layers at the surface. The purpose of diffusion annealing (DA) after HDA is to modify the aluminide layers for more homogeneous structure by interdiffusion of the elements in these layers to obtain improved properties. Even though there are several works concerning surface characteristics, wear and oxidation resistance of the surface after HDA and subsequent DA processes, their effects on fatigue properties of Inconel 718 superalloy have not been investigated much. Therefore, the effect of these processes on the fatigue behavior of a solution treated Inconel 718 superalloy was investigated in this study. Experimental results showed that application of these coating methods significantly reduced fatigue strength of Inconel 718. Considering the fact that fatigue cracks mostly start from the surface, it was concluded that the reduced fatigue properties were arisen from the brittle nature of the phases at the surface, and of the superalloy itself after the application of HDA and DA processes.