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Study on Microstructure and Properties of Ni60A/WC Composite Coating by Alternating-Magnetic-Field-Assisted Laser

Yuxu Zhu1, Houming Zhou1, Zixin Chen1

  • 1School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China.

Micromachines
|May 28, 2022
PubMed
Summary

Alternating magnetic fields enhance tungsten carbide (WC) particle distribution in Ni60A/WC composite coatings. This improves microstructure, hardness, and wear resistance of the steel substrate.

Keywords:
alternating magnetic fieldlaser claddingmicrohardnessmicrostructurewear property

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Tribology

Background:

  • Laser cladding is used to create composite coatings for enhanced material properties.
  • Tungsten carbide (WC) particles are often incorporated to improve wear resistance.
  • Controlling particle distribution in laser cladding is crucial for coating performance.

Purpose of the Study:

  • To investigate the effect of alternating magnetic fields on WC particle distribution in Ni60A/WC composite coatings.
  • To analyze the influence of magnetic field intensity on microstructure, phase composition, microhardness, and wear properties.
  • To understand the mechanism of alternating magnetic fields in laser cladding.

Main Methods:

  • Preparation of Ni60A/WC composite coating on a 45 steel substrate using alternating-magnetic-field-assisted laser cladding.
  • Comparison of coatings prepared under varying magnetic field intensities.
  • Analysis of WC particle distribution, microstructure, phase composition, microhardness, and wear behavior.

Main Results:

  • Alternating magnetic fields significantly homogenize WC particle distribution, dispersing them from the bottom to the middle and upper regions of the laser pool.
  • WC content in the bottom regions decreased, while it increased in the top regions.
  • The magnetic field stirring refined the carbide hard phase, improved coating microhardness, and enhanced wear properties.
  • Adhesive and abrasive wear decreased with increasing magnetic field strength.

Conclusions:

  • Alternating magnetic fields are effective in controlling WC particle distribution during laser cladding.
  • Optimized magnetic field application leads to improved microstructure, enhanced hardness, and superior wear resistance of Ni60A/WC composite coatings.
  • The study provides insights into the mechanism of magnetic field assistance in laser cladding processes.