LAUSR

Selective laser melting (SLM)-assisted 3D printing was employed to directly fabricate Ni-Fe-based permalloy magnetic shields of fiber optic gyroscopes in spacecraft. Process optimization was conducted for the quantitative analyses of the influences of laser processing parameters on the bulk density and surface roughness of the as-printed parts. It contributed to the determination of the suitable SLM process conditions to improve the as-printed quality and further explore the formation mechanisms of Ni-Fe-Mo soft magnets. The SLM-generated microstructures with hierarchical characteristics, involving molten pools or tracks, austenite grains and cellular substructures, were dissected before and after the recrystallization annealing treatment. The soft magnetic properties of as-printed permalloy Ni-15Fe-5Mo with and in the absence of the annealing were comparatively evaluated, proving to be comparable to those of the conventionally processed permalloy parts. The lightweight magnetic shields were 3D-printed, showing the feasibility and applicability of SLM.