Finished surface morphology, microstructure and magnetic properties of selective laser melted Fe-50wt% Ni permalloy

This work focuses on the structure and magnetic properties of Fe-50wt% Ni permalloy manufactured from pre-alloyed powder by selective laser melting (SLM). The melted (SLMed) alloys were characterized a 3D profilometer, optical microscope, scanning electron X-ray diffraction, etc. effects volume energy density (LVED) structure, with coercivity (Hc), remanence (Br), power losses (P50-1), evaluated discussed systematically. results show that relative porosity rate surface roughness SLMed specimens decreased increase in LVED. Only γ-(FeNi) phase was detected diffraction patterns permalloys fabricated different LVEDs. Statistical analysis microscopy images indicated grain coarsened at higher Furthermore, microstructure parts typical columnar an oriented growth building direction. highest microhardness reached 198 HV0.1. Besides, including Br, Hc, P50-1 samples when LVED ranged 33.3 to 60.0 J/mm3 firstly then increased while further up 93.3 J/mm3, which is related decrease size, residual stress microcracks presented using very high observed evolution provides good compromise terms reduced crack formation for fabrication permalloy. theoretical mechanism this study can offer guidance investigate soft alloys.