Micro-cracking, microstructure and mechanical properties of Hastelloy-X alloy printed by laser powder bed fusion: As-built, annealed and hot-isostatic pressed

This study analyses literature data to identify optimised print parameters and assesses the consolidation, microstructure, mechanical properties of Hastelloy-X printed by laser powder bed fusion. Effects post annealing hot-isostatic pressing (HIP) on microstructure are also revealed. The susceptibility solidification cracking was evaluated basis gradient freezing range obtained via calculation thermodynamic phase diagrams (CALPHAD). In addition, such as precipitation chemical segregation were predicted using CALPHAD. distribution cracks throughout builds quantified for as-built, annealed HIP conditions. assessment reveals variation crack density towards bottom, top free surface solid builds. is found be associate with thermal effective conductivity, which estimated analytical calculations. While both can alter as-printed thanks recovery recrystallisation, internal micro-cracks pores only successfully removed HIP. addition removal, recrystallisation in (stronger than annealing), resulting optimal including a substantial increase elongation from 13% 20%, significant improvement ultimate tensile stress 965 MPa 1045 moderately high yield precipitation.