Abstract Selective laser melting (SLM) additive manufacturing (AM) has garnered significant interest in nickel (Ni)-based oxide dispersion strengthened (ODS) alloys to achieve enhanced performance of heat exchanger at elevated temperature. However, achieving uniform distribution of strengthening nanoparticles throughout the metal matrix has proved to be a challenge for many researchers. This study, hence, focuses on processing of yttria (Y2O3) nanoparticles added Haynes 214, a Ni-based alloy, with SLM process. The optimization of SLM processing window was systematically conducted to create near-dense coupons. Agglomeration of yttria nanoparticles and formation of extensive network of cracks were observed in the ODS versions. Two strategies - a) feedstock powder preparation using ball milling and b) laser remelting - were found to be effective to achieve the homogeneous dispersion of nanoparticles as well as prevent crack formations. For each feedstock powder, tensile testing coupons were produced using the optimized processing parameters and high temperature (1000 and 1100 °C) mechanical testing was conducted. The effect of Y2O3 addition on the high-temperature tensile properties of Haynes 214 was investigated.
Poudel et al. (Thu,) studied this question.