Comparative Mechanical Characterization of Additively Manufactured Nickel-Based Superalloys Using Indentation Plastometry and Miniature Tensile Testing

Additively manufactured IN718 and Hastelloy X components in pre-service and post-service conditions were characterized using profilometry-based indentation plastometry (PIP) and miniature tensile testing. Local mechanical behavior was evaluated from indentation-induced surface profiles, and elevated-temperature PIP measurements were performed where required. Miniature tensile specimens extracted from the components were tested at room temperature, and strain evolution was quantified by three-dimensional digital image correlation (3D-DIC). The results were compared to assess the sensitivity and applicability of the two methods for detecting service-induced property changes and for supporting quality assessment and residual life evaluation of additively manufactured high-temperature alloy components.