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<p>Applying an&#xa0;alternating magnetic field can effectively improve the element distribution difference in the cladding layer.&#xa0;However, the influence of the dynamic magnetic field on the cladding process involves multiple magnetic fluid interaction phenomena.&#xa0;The mechanism by which alternating magnetic fields regulate elements in the molten pool cannot be revealed solely through experimental methods. As such, a multi-field coupling model for the alternating magnetic field-assisted laser cladding process of Fe60 was established. At a magnetic field strength of 40 mT, the results indicate that the Lorentz force exhibits two peaks within half a cycle, with a maximum value of 1 × 10^4 N/m<sup>3</sup>. The dynamic Lorentz force induces a stirring effect within the molten pool, resulting in enhanced flow velocity and a reduction in the central temperature of the molten pool. The maximum velocity of the molten pool increased from 0.257 to 0.267&#xa0;m/s. The core temperature of the molten pool decreased from 2754 to 2742 K. During the heat and mass transfer process, the alternating magnetic fields significantly enhanced the diffusion ability of elements. The Fe concentration on the surface of the molten pool increases from 86.81 to 87.35 wt%, and the Cr concentration decreases from 6.05 to 5.74 wt%. The element distribution is smooth after cladding. Especially in the marginal region, the phenomenon of element segregation and enrichment is obviously reduced. As such, this study provides an effective prediction model for the&#xa0;heat and mass transfer process of laser cladding assisted by alternating magnetic fields, while also offering theoretical insights and technical support for optimizing coating quality and performance.</p>

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Study on transfer mechanism of mass in laser cladding Fe60 process assisted by alternating magnetic field

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Jiabo Liu,
  • Chang Li,
  • Shuchao Li,
  • Qian Sun,
  • Xing Han,
  • Cong Wang

摘要

Applying an alternating magnetic field can effectively improve the element distribution difference in the cladding layer. However, the influence of the dynamic magnetic field on the cladding process involves multiple magnetic fluid interaction phenomena. The mechanism by which alternating magnetic fields regulate elements in the molten pool cannot be revealed solely through experimental methods. As such, a multi-field coupling model for the alternating magnetic field-assisted laser cladding process of Fe60 was established. At a magnetic field strength of 40 mT, the results indicate that the Lorentz force exhibits two peaks within half a cycle, with a maximum value of 1 × 10^4 N/m3. The dynamic Lorentz force induces a stirring effect within the molten pool, resulting in enhanced flow velocity and a reduction in the central temperature of the molten pool. The maximum velocity of the molten pool increased from 0.257 to 0.267 m/s. The core temperature of the molten pool decreased from 2754 to 2742 K. During the heat and mass transfer process, the alternating magnetic fields significantly enhanced the diffusion ability of elements. The Fe concentration on the surface of the molten pool increases from 86.81 to 87.35 wt%, and the Cr concentration decreases from 6.05 to 5.74 wt%. The element distribution is smooth after cladding. Especially in the marginal region, the phenomenon of element segregation and enrichment is obviously reduced. As such, this study provides an effective prediction model for the heat and mass transfer process of laser cladding assisted by alternating magnetic fields, while also offering theoretical insights and technical support for optimizing coating quality and performance.