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Texture, Microstructure, and Properties of Fe-Cr-Co Permanent Magnetic Alloy Fabricated by Laser Powder Bed Fusion In-Situ Alloying

  • Yazhou He,
  • Yaqing Hou,
  • Xiaoqun Li,
  • Hao Zhang,
  • Fafa Li,
  • Dong Zhou,
  • Hang Su

摘要

This study on laser powder bed fusion (LPBF) in-situ alloying of Fe-25Cr-15Co (wt.%) permanent magnetic alloy addresses the anisotropy in texture, microstructure, and properties through comprehensive microstructural characterizations. The microstructure, magnetic properties, and mechanical properties of the specimens exhibit anisotropy. The \(\langle 100\rangle \) 100 fiber texture and Goss-type \(\left\{110\right\}\) 110 〈001〉 texture are observed in the vertical plane of the as-built sample, which imparts anisotropic magnetic properties to the sample. The longitudinal sample, parallel to the building direction, exhibits superior magnetic properties, with coercivity \({H}_{{\text{c}}}\) H c , remanence \({B}_{{\text{r}}}\) B r , and energy product \({(BH)}_{{\text{max}}}\) ( B H ) max values of 22.35 kA/m, 0.84 T, and 7.24 kJ/m3, respectively, which are equivalent to those in the isotropic state prepared by traditional methods. Hardness and compression experiments demonstrate that the mechanical properties of the LPBF-built samples are better than those of the as-cast samples. The results of this study validate the feasibility of applying the LPBF in-situ alloying technique to Fe-Cr-Co permanent magnet alloys. This technique makes it possible to further explore the potential of Fe-Cr-Co magnetic materials by freely adjusting the composition and constituents of the materials, and to fabricate components or structures with complex shapes while maintaining excellent magnetic and mechanical properties.