Determination of elastic properties in metal parts made via additive manufacturing using ultrasonic measurements

Abstract

The scope of this study was to determine Young's modulus using ultrasonic measurements for two probes obtained through additive manufacturing. The Young modulus can be determined through simple computations based on measured longitudinal and transversal elastic wave velocities and material density. The Young modulus determinations were carried out on two samples manufactured differently, one measurement performed by NUCLEAR NDT Research & Services, which is RENAR (Romanian Accreditation Association) certified organization, and another performed by COMOTI in cooperation with IMSAR (Solid Mechanics Institute of the Romanian Academy). The studies carried out were on additive manufacturing samples made of INCONEL 625 material before thermal treatment. The paper presents the steps followed: Density determination, Time of Flight determination, Longitudinal and transversal wave velocities determination and Young Modulus and Poisson coefficient determination. A comparative study between the two measurement datasets was carried out. The results obtained were similar, so the procedure to determine the elastic properties of the metal parts made via additive manufacturing using ultrasonic measurements is validated. The observed small differences of the values could be induced by the probes thickness.