Effects of scanning strategy on the magnetic and mechanical properties of laser-based powder bed fused Nd-Fe-B magnets

Le résumé fourni par la source

In the past decades, laser-based powder bed fusion (LPBF) has been well-established for near-net-shape forming Nd-Fe-B magnets, efficiently employing the rare-earth elements (REE) and exhibiting the potential for directly fabricating magnets with complex shapes. In this work, four scanning strategies, including unidirectional, bidirectional, contour and island scanning, were utilized to systematically compare the magnetic and mechanical properties of as-built Nd-Fe-B magnets. Bidirectional strategy showed superiority in densification, surface flatness, hardness, friction resistance and magnetic properties. The relative densification of 97.1%, surface roughness Sa of 4.9 μm, nano-hardness of 18 GPa and COF (coefficient of friction) of 0.135 were simultaneously achieved with relatively balanced magnetic parameters and agreeable thermal ability. Specifically, H cj , B r and ( BH ) max were around 10.73 kOe, 6.50 kGs and 7.94 MGOe, respectively. Numerical results show that the cooling rate is relatively high with the lowest residual stress for bidirectional strategy. This work emphasizes the importance of appropriate scanning strategy on the improvement of LPBF-built Nd-Fe-B magnets.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.