High temperature oxidation behavior of DMLs produced inconel 625

Paper in proceeding, 2020

This work presents a study of the high temperature oxidation behavior of Inconel 625 (IN625) processed by direct metal laser sintering (DMLS). IN625 is a Nickel-based superalloy characterized by outstanding high temperature oxidation and corrosion resistance. However, taking into account that DMLS produced IN625 has significantly different microstructure and surface properties than the conventional produced IN625, it is important to evaluate the potential change in the oxidation behavior of this alloy, not reported in literature yet. In this study a complete characterization of the oxidation behavior of DMLS fabricated IN625, in as-built and solutionized (1150°C/2h) conditions, was performed at 900°C for 8, 24, 48, 72 and 96 hours in air. Oxidized samples were characterized utilizing advanced microscopy and surface analysis techniques (SEM+EDX, XPS). Results indicate that oxide formed is mainly composed of Cr2O3. Oxidation stabilizes after around 24 hours, indicating good corrosion resistance of the DMLS produced IN625.