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<p>Defects like pores and cracks in laser cladding coatings are difficult to eliminate, even with optimized parameters and post-heat treatments. Owing to the low thermal expansion characteristics of magnetostrictive materials, the above defects can be suppressed via introducing magnetostrictive effect during the laser cladding possibly. Here, using the magnetic field-assisted laser cladding, we prepared Fe-Co coatings and investigated the effects of the contents of Sm on the macroscopic morphologies, phase compositions, and microstructures of the coatings&#xa0;under two different magnetic field configurations: alternating and direct current (DC). To detect the magnetostrictive strains produced by the coatings under the above magnetic fields, a quantitative evaluation method for the magnetostriction based on x-ray diffraction measurements was developed. The coatings fabricated under alternating magnetic fields have negative magnetostriction, whereas the counterparts under DC magnetic fields possess positive magnetostriction. Besides, the magnetostriction of the former is larger than that of the latter. The lattice structures of the Fe-Co coating can be effectively tailored through the magnetic field excitation and gradient Sm-doping, giving rise to the enhanced magnetic properties. Moreover, the coating has more finer grains and more denser microstructures when the Sm-doping is 5 wt.%, resulting in superior overall performance.</p>

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Study on Magnetostrictive Effect and Microstructure Characterization of Laser-Cladded Fe-Co Alloy Coating under External Magnetic Field Excitation

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Fengmin Zhou,
  • Yong Yang,
  • Weibo Li,
  • Wenchao Lu,
  • Xianghuan Fan,
  • Kai Han

摘要

Defects like pores and cracks in laser cladding coatings are difficult to eliminate, even with optimized parameters and post-heat treatments. Owing to the low thermal expansion characteristics of magnetostrictive materials, the above defects can be suppressed via introducing magnetostrictive effect during the laser cladding possibly. Here, using the magnetic field-assisted laser cladding, we prepared Fe-Co coatings and investigated the effects of the contents of Sm on the macroscopic morphologies, phase compositions, and microstructures of the coatings under two different magnetic field configurations: alternating and direct current (DC). To detect the magnetostrictive strains produced by the coatings under the above magnetic fields, a quantitative evaluation method for the magnetostriction based on x-ray diffraction measurements was developed. The coatings fabricated under alternating magnetic fields have negative magnetostriction, whereas the counterparts under DC magnetic fields possess positive magnetostriction. Besides, the magnetostriction of the former is larger than that of the latter. The lattice structures of the Fe-Co coating can be effectively tailored through the magnetic field excitation and gradient Sm-doping, giving rise to the enhanced magnetic properties. Moreover, the coating has more finer grains and more denser microstructures when the Sm-doping is 5 wt.%, resulting in superior overall performance.