Laser powder bed fusion of advanced submicrometer TiB2 reinforced high-performance Ni-based composite

The Ni-based Hastelloy X (HX) superalloy is widely used in aero-engine components because of its exceptional high-temperature strength and oxidation resistance. Given the complex structure such parts, additive manufacturing (AM) technologies as laser powder bed fusion (LPBF) are employed to manufacture these components. HX alloy suffers from crack susceptibility during LPBF process, however. In this paper, issue was addressed by adding 2 wt% submicrometer TiB2 through a high-speed mixing process. Both low-angle grain boundaries (LAGBs) high-angle (HAGBs) were noted have increased as-fabricated HX-2 wt.% composite, with an average size reduction 14 ?m 8.69 ?m. addition, compared pure HX, hardness composite 43.4% 50.8% at room-temperature (850 °C) conditions, respectively. This indicates that added reinforcement more influential mechanical property enhancement under room temperature conditions. sample also showed 28% increase yield while ductility not found be sacrificed indicating addition specific ceramic particles suitable content may offer new method for crack-free high-strength high-toughness AM These findings provide reference improving properties other advanced materials made