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<p>Tungsten carbide (WC) is an alloy powder with excellent performance. However, there are significant technical bottlenecks in the high-content WC composite cladding process. Owing to the density difference between the WC hard phase and the metal matrix, WC particles tend to deposit and cluster during the cladding process, forming a concentrated zone at the bottom of the coating. This can induce cracks, pores, and other defects, resulting in uneven performance of the cladding layer and reducing the service life of the workpiece by 40–50%. Research indicates that the alternating magnetic field-assisted process generates Lorentz forces to implement electromagnetic stirring, thereby achieving a more uniform distribution of WC particles. This process enhances heat and mass transfer efficiency and promotes grain refinement. In this paper, a numerical model of the laser cladding process of 42CrMo with nickel-based WC60 composite powder was established. The influence of stress-fatigue laws on the cladding process under no magnetic field and with magnetic fields of 20 mT, 40 mT, and 60 mT was calculated respectively. Scanning electron microscope (SEM), x-ray diffraction (XRD), and microhardness observations were conducted to examine the microstructure morphology, phase composition, and hardness of the cladding layer. Based on the test results, an internal model of the cladding layer was established, and the derived distribution of internal stress was calculated. Calculations show that alternating magnetic fields significantly affect the sedimentation and stress distribution of WC particles. The stronger the field, the more WC particles float. The smaller the stress derived, the higher the hardness.</p>

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Study on the Mechanism of Stress Derivation in Laser Cladding WC60 Assisted by Alternating Magnetic Field

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Chang Li,
  • Qian Sun,
  • Ruijun Wang,
  • Yiqi Wang,
  • Xing Han

摘要

Tungsten carbide (WC) is an alloy powder with excellent performance. However, there are significant technical bottlenecks in the high-content WC composite cladding process. Owing to the density difference between the WC hard phase and the metal matrix, WC particles tend to deposit and cluster during the cladding process, forming a concentrated zone at the bottom of the coating. This can induce cracks, pores, and other defects, resulting in uneven performance of the cladding layer and reducing the service life of the workpiece by 40–50%. Research indicates that the alternating magnetic field-assisted process generates Lorentz forces to implement electromagnetic stirring, thereby achieving a more uniform distribution of WC particles. This process enhances heat and mass transfer efficiency and promotes grain refinement. In this paper, a numerical model of the laser cladding process of 42CrMo with nickel-based WC60 composite powder was established. The influence of stress-fatigue laws on the cladding process under no magnetic field and with magnetic fields of 20 mT, 40 mT, and 60 mT was calculated respectively. Scanning electron microscope (SEM), x-ray diffraction (XRD), and microhardness observations were conducted to examine the microstructure morphology, phase composition, and hardness of the cladding layer. Based on the test results, an internal model of the cladding layer was established, and the derived distribution of internal stress was calculated. Calculations show that alternating magnetic fields significantly affect the sedimentation and stress distribution of WC particles. The stronger the field, the more WC particles float. The smaller the stress derived, the higher the hardness.