Microstructure of Fe-Nd-B processed by selective laser meltingWednesday (26.09.2018) 17:48 - 17:51 S1/03 - 221 Part of:
Additive manufacturing technologies like selective laser melting (SLM) based on laser powder bed fusion (LPBF) offer new opportunities for many kinds of functional materials. However, Fe-Nd-B based permanent magnet material being very promising for high-power motor applications in car industry seems to be very challenging concerning processing by additive manufacturing. This may be mainly because Fe-Nd-B based powders are extremely sensitive to oxidization and that for many applications anisotropy is required. For lab scale additive manufacturing of such powders a special inert gas process chamber has been developed. In this work, the influence of manufacturing parameters like laser power, laser scan velocity and volume energy density on the microstructure and related properties are studied for powder compositions which are typically used for the production of sintered magnets. The results are compared to conventional as-cast and strip-cast materials. It turns out, that selective laser melting of Fe-Nd-B based powders may allow the realization of significantly finer microstructures. The novel structures have great potential to receive smaller particle sizes for green compacts and sintered magnets and therefore larger coercivities.