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6469 |
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The microstructures and magnetic properties of selective laser melted Fe-3%wtSi soft magnetic alloys |
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Shuohong Gao* / UTBM, France Nouredine Fenineche / ICB UMR, CNRS, Univ. Bourgogne Franche-Comté, UTBM, France Hanlin Liao/ ICB UMR, CNRS, Univ. Bourgogne Franche-Comté, UTBM, France Xingchen Yan / ICB UMR, CNRS, Univ. Bourgogne Franche-Comté, UTBM, France |
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To understand the effect of the laser energy input on microstructures and magnetic properties of Fe-3%wtSi alloys. Fe-3%wtSi soft magnetic alloys were manufactured by selective laser melting (SLM) process using Fe-3%wtSi alloy powder as raw material in different laser energy input. The microstructure of SLM Fe-3%wtSi alloy was characterized using optical microscope (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The magnetic properties are determined by hysteresis measurements. It can be identified that the porosity of Fe-3%wtSi soft magnetic alloys decreases with the increase of laser line energy density. However, micro-cracks appear under too high laser power. The cross-sectional microstructure of them is typical columnar with a growth direction of building direction. The microstructure of both the powder and SLM alloys is characterized by a single bcc-phase with no sign of phase ordering. The coercivity of SLM alloys decreases first and then increases with the increase of laser energy input, which indicates that defects such as pores and cracks significantly effect on the magnetic properties. |