Journal
OPTICS AND LASER TECHNOLOGY
Volume 99, Issue -, Pages 276-281Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2017.09.012
Keywords
High-entropy alloy coating; Laser remelting; Wear resistance; Micro-hardness microstructure
Categories
Funding
- National Natural Science Foundation of China [51575118, 51775127]
- National Basic Research Program of China (973 Program) [61328303]
- China Postdoctoral Science Foundation [2017T100225]
- Fundamental Research Funds for the Central Universities [HEUCFP201608]
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An attempt, combined with the technologies of laser cladding and laser remelting, has been made to develop a Ni-Cr-Co-Ti-V high entropy alloy coating. The phase composition, microstructure, micro hardness and wear resistance (rolling friction) were studied in detail. The results show that after laser remelting, the phase composition remains unchanged, that is, as-cladded coating and as-remelted coatings are all composed of (Ni, Co)Ti-2 intermetallic compound, Ti-rich phase and BCC solid solution phase. However, after laser remelting, the volume fraction of Ti-rich phase increases significantly. Moreover, the micro-hardness is increased, up to similar to 900 HV at the laser remelting parameters: laser power of 1 kW, laser spot diameter of 3 mm, and laser speed of 10 mm/s. Compared to the as-cladded high-entropy alloy coating, the as-remelted high-entropy alloy coatings have high friction coefficient and low wear mass loss, indicating that the wear resistance of as-remelted coatings is improved and suggesting practical applications, like coatings on brake pads for wear protection. The worn surface morphologies show that the worn mechanism of as-cladded and as-remelted high-entropy alloy coatings are adhesive wear. (C) 2017 Elsevier Ltd. All rights reserved.
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