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<p>Alternating magnetic field-assisted laser cladding (AMF-LC) is a significant technique for repairing and enhancing the properties of magnetic materials. However, dynamic magnetic fields induce various electromagnetic effects in magnetic substrates, which makes it challenging to reveal the mechanism of AMF’s influence on the melt pool through experiments alone. Therefore, a three-dimensional numerical model of AMF-assisted laser cladding was established. Based on this model, the distribution mechanism of the magnetic field and its dynamic change in the substrate were studied. The evolution law of the eddy current effect was analyzed. The influence of the Lorentz force on heat flow behavior and microstructure was quantitatively revealed. The results show that the dynamic magnetic field drives the generation of eddy currents and the Lorentz force. The stirring behavior of the Lorentz force causes the flow velocity to increase by 4.65% and the central temperature to decrease by 10&#xa0;K. The fluid state is significantly improved with reduced heat concentration. With the increase of magnetic field intensity, the flow velocity becomes more intense. Magnetic agitation promotes grain refinement. The microstructure of the cladding layer was significantly improved. This study provides a theoretical foundation for optimizing the AMF-LC process and repair of magnetic materials in manufacturing.</p>

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Mechanism of alternating magnetic field on heat and flow behavior during laser cladding of Fe60 on magnetic substrate

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Jiabo Liu,
  • Chang Li,
  • Guoning Shi,
  • Ruihan Wang,
  • Xing Han

摘要

Alternating magnetic field-assisted laser cladding (AMF-LC) is a significant technique for repairing and enhancing the properties of magnetic materials. However, dynamic magnetic fields induce various electromagnetic effects in magnetic substrates, which makes it challenging to reveal the mechanism of AMF’s influence on the melt pool through experiments alone. Therefore, a three-dimensional numerical model of AMF-assisted laser cladding was established. Based on this model, the distribution mechanism of the magnetic field and its dynamic change in the substrate were studied. The evolution law of the eddy current effect was analyzed. The influence of the Lorentz force on heat flow behavior and microstructure was quantitatively revealed. The results show that the dynamic magnetic field drives the generation of eddy currents and the Lorentz force. The stirring behavior of the Lorentz force causes the flow velocity to increase by 4.65% and the central temperature to decrease by 10 K. The fluid state is significantly improved with reduced heat concentration. With the increase of magnetic field intensity, the flow velocity becomes more intense. Magnetic agitation promotes grain refinement. The microstructure of the cladding layer was significantly improved. This study provides a theoretical foundation for optimizing the AMF-LC process and repair of magnetic materials in manufacturing.