Hardness Variation in DED Produced Inconel 718

L. Chechik, A.D. Goodall, K.A. Christofidou, I. Todd

Research output: Working paperPreprint

Abstract / Description of output

Directed energy deposition (DED) research of Inconel 718 is of critical for repair of aerospace components, which have tight tolerances of mechanical properties. Significant hardness variation has been seen throughout DED manufactured Inconel 718 components, which must be understood, so the variation can either be removed, or designed around. Using in-situ monitoring, hardness, EBSD and DSC, γ” was shown to be the cause of hardness variation throughout the component. A simple precipitation potential model based on a moving heat source correlates with the hardness results measured and explains the hardness distribution observed. In addition, it’s been shown that sections under a critical thickness never reach the peak hardness in the as-built condition. This understanding allows for in-situ heat treatment strategies to be developed for microstructural and hence mechanical property optimisation, necessary for repair technologies where post processing steps are prohibitive.
Original languageUndefined/Unknown
PublisherSocial Science Research Network (SSRN)
Publication statusPublished - 21 Apr 2022

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