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Effect of Laser Energy Density on Surface Morphology, Microstructure, and Magnetic Properties of Selective Laser Melted Fe-3wt.% Si Alloys

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Abstract

To study the effect of the laser energy density (LED) on surface morphology, microstructural evolution, and magnetic properties of Fe-3wt.% Si alloy, the alloy was manufactured via selective laser melting (SLM) technology. The SLM Fe-3wt.% Si parts were characterized by a series of advanced material methods including a 3D profilometer, optical microscope, scanning electron microscopy, and vibrating sample magnetometer, etc. The results show that no obvious microcracks exist in the SLM Fe-3wt.% Si parts. With the LED increases, the porosity rate and the surface roughness of the SLM Fe-3wt.% Si parts decrease. Furthermore, the cross-sectional microstructure of the SLM Fe-3wt.% Si parts is a typical columnar structure with an orientation growth building direction. The microhardness of each SLM Fe-3wt.% Si sample is higher than 200 HV0.1. Besides, the coercivity of SLM Fe-3wt.% Si parts decreases first and then increases with the increase in the LED. The specimen with a LED at 300 J/m exhibits better comprehensive magnetic properties than others. It could be concluded that the magnetic properties of SLM Fe-3wt.% Si alloys are affected by the synergistic effects of manufacturing defects and internal stress.

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Acknowledgments

The author reports no conflicts of interest in this work. This work is supported by the Sciences Platform Environment and Capacity Building Projects of GDAS (2021GDASYL-20210102005). As one of the authors, Shuohong Gao would like to thank the support from the program of CSC (201801810066). The author, Cheng Chang, would like to thank the support from the program of CSC (201801810106).

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Authors and Affiliations

  1. ICB UMR 6303, CNRS, Univ. Bourgogne Franche-Comté, UTBM, 90010, Belfort, France

    Shuohong Gao, Xingchen Yan, Hanlin Liao & Nouredine Fenineche

  2. National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou, 510651, P.R. China

    Shuohong Gao, Xingchen Yan & Min Liu

  3. ICD-LASMIS, UMR CNRS 6281, University of Technology of Troyes, 12 rue Marie Curie, CS 42060, 10004, Troyes Cedex, France

    Cheng Chang

  4. Nipson Technology, 90000, Belfort, France

    Eric Aubry

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  1. Shuohong Gao
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Correspondence to Xingchen Yan.

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This invited article is part of a special topical focus in the Journal of Materials Engineering and Performance on Additive Manufacturing. The issue was organized by Dr. William Frazier, Pilgrim Consulting, LLC; Mr. Rick Russell, NASA; Dr. Yan Lu, NIST; Dr. Brandon D. Ribic, America Makes; and Caroline Vail, NSWC Carderock.

The original version of this article was revised: In the second sentence of Conclusion 1, “increase” was inadvertently used in place of “decrease.” The sentence should read “And the decrease in the porosity rate of corresponding specimens is related to the increase in LED.”

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Gao, S., Yan, X., Chang, C. et al. Effect of Laser Energy Density on Surface Morphology, Microstructure, and Magnetic Properties of Selective Laser Melted Fe-3wt.% Si Alloys. J. of Materi Eng and Perform 30, 5020–5030 (2021). https://doi.org/10.1007/s11665-021-05591-w

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