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Investigation of fundamental ultrasonic propagation characteristics in NDT of electron beam melting additive manufactured samples

Tofeldt, O and Pierce, SG and Smillie, G and Kerr, William and Flockhart, GMH and Macleod, CN and Blue, R and Gachagan, A and Stratoudaki, T and Andersson, J and McMahon, D (2018) Investigation of fundamental ultrasonic propagation characteristics in NDT of electron beam melting additive manufactured samples. In: 12th European Conference on Non-Destructive Testing, 2018-06-11 - 2018-06-15, http://www.ecndt2018.com/. (In Press)

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New approaches for efficient NDT inspection of modern additively manufactured metallic components are required urgently to qualify and validate the next generation of metallic parts across a range of industries. Ultrasonic testing is a fundamental component of NDT for such additive manufacturing processes. This work studies the ultrasonic propagation characteristics of EBM manufactured sample coupons in Alloy 718 material. Fundamental longitudinal and shear wave velocity measurements are experimentally measured in 3 orthogonal build directions of the sample coupons. Results show a dependency of the ultrasonic velocities and the build direction. The measured velocities are further verified in a phased array measurement showing successful results that highlights the potential of continued studies with synthetic apertures techniques.