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<p>Titanium alloys are materials formed by adding alloying elements (metallic or non-metallic) such as aluminum, vanadium, and molybdenum to a titanium base. These materials have critical applications in aerospace, biomedical, and chemical equipment. Given the technical difficulties associated with the short service life of wear-resistant parts under severe working conditions, such as high strength, hardness, and abrasion, we chose to use laser-directed energy deposition to form a wear-resistant layer using fusion-coated WC powder and Ti6Al4V powder. In this experiment, the addition of an air release valve in the device and the use of higher laser power processes can make the coating better bond, control the pressure, reduce the stress concentration, thus reducing the wear rate, in order to better achieve the purpose of the test. The results of the study show that the cladding layer forms a good bonding interface with the substrate, and the microstructure is observed to be free of porosity as well as cracks. The hardness of the substrate without added WC particles was 340&#xa0;HV, and the average hardness of the added 50% WC fusion cladding layer was the highest at 870&#xa0;HV, which was 2.56 times higher than that of the substrate. The wear coefficient of the Ti6Al4V substrate (0.988) and that of the added 40% WC particles were the most wear-resistant, with a wear coefficient of 0.638, and the wear manifested itself in the form of abrasive and adhesive wear as well as oxidative wear.</p>

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Effect of WC Content on Microstructure and Properties of Ti6Al4V Deposited by Laser-Directed Energy Deposition

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Weichun Zhao,
  • Fei Xing,
  • Chenyang Wang,
  • Zijian Wang,
  • Weijun Liu,
  • Hongyou Bian

摘要

Titanium alloys are materials formed by adding alloying elements (metallic or non-metallic) such as aluminum, vanadium, and molybdenum to a titanium base. These materials have critical applications in aerospace, biomedical, and chemical equipment. Given the technical difficulties associated with the short service life of wear-resistant parts under severe working conditions, such as high strength, hardness, and abrasion, we chose to use laser-directed energy deposition to form a wear-resistant layer using fusion-coated WC powder and Ti6Al4V powder. In this experiment, the addition of an air release valve in the device and the use of higher laser power processes can make the coating better bond, control the pressure, reduce the stress concentration, thus reducing the wear rate, in order to better achieve the purpose of the test. The results of the study show that the cladding layer forms a good bonding interface with the substrate, and the microstructure is observed to be free of porosity as well as cracks. The hardness of the substrate without added WC particles was 340 HV, and the average hardness of the added 50% WC fusion cladding layer was the highest at 870 HV, which was 2.56 times higher than that of the substrate. The wear coefficient of the Ti6Al4V substrate (0.988) and that of the added 40% WC particles were the most wear-resistant, with a wear coefficient of 0.638, and the wear manifested itself in the form of abrasive and adhesive wear as well as oxidative wear.