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<p>To overcome the dissolution of WC, which would cause the formation of defects, WC was synthesized in situ into a composite coating by laser cladding using tungsten and nickel-coated graphite powders. The results showed that the graphite and tungsten can be completely converted to WC, and the coatings mainly consisted of Ni<sub>0.64</sub>Fe<sub>0.36</sub> and WC phases. As the overlap rate increased from 65% to 85% during laser cladding, the size of the WC grains gradually increased from 13.88&#xa0;µm to 31.53&#xa0;µm, which was attributed to promotion in the nucleation and growth of WC by allowing more previously formed WC to act as nucleation sites. The coating had the lowest wear rate of 3.21 × 10<sup>-6</sup> mm<sup>3</sup> N<sup>-1</sup>&#xa0;m<sup>-1</sup> at an overlap rate of 70%, which was attributed to the formation of a high content of uniformly distributed WC (with a microhardness of about 2100 HV<sub>0.1</sub>), that significantly enhanced the effects of boundary strengthening and precipitation strengthening.</p>

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In Situ Synthesis of High-Performance WC-Reinforced Ni-Based Composite Coatings by Laser Cladding

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Zhibin Yan,
  • Weizhou Li,
  • Shengyuan Lei,
  • Ruixia Yang,
  • Dechang Zeng

摘要

To overcome the dissolution of WC, which would cause the formation of defects, WC was synthesized in situ into a composite coating by laser cladding using tungsten and nickel-coated graphite powders. The results showed that the graphite and tungsten can be completely converted to WC, and the coatings mainly consisted of Ni0.64Fe0.36 and WC phases. As the overlap rate increased from 65% to 85% during laser cladding, the size of the WC grains gradually increased from 13.88 µm to 31.53 µm, which was attributed to promotion in the nucleation and growth of WC by allowing more previously formed WC to act as nucleation sites. The coating had the lowest wear rate of 3.21 × 10-6 mm3 N-1 m-1 at an overlap rate of 70%, which was attributed to the formation of a high content of uniformly distributed WC (with a microhardness of about 2100 HV0.1), that significantly enhanced the effects of boundary strengthening and precipitation strengthening.