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Volume 17 Issue 4
Aug.  2010
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Jun Li, Zhi-shui Yu, Hui-ping Wang,  and Man-ping Li, Microstructural evolution of titanium matrix composite coatings reinforced by in situ synthesized TiB and TiC by laser cladding, Int. J. Miner. Metall. Mater., 17(2010), No. 4, pp. 481-488. https://doi.org/10.1007/s12613-010-0345-1
Cite this article as:
Jun Li, Zhi-shui Yu, Hui-ping Wang,  and Man-ping Li, Microstructural evolution of titanium matrix composite coatings reinforced by in situ synthesized TiB and TiC by laser cladding, Int. J. Miner. Metall. Mater., 17(2010), No. 4, pp. 481-488. https://doi.org/10.1007/s12613-010-0345-1
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Microstructural evolution of titanium matrix composite coatings reinforced by in situ synthesized TiB and TiC by laser cladding

  • 通讯作者:

    Jun Li    E-mail: jacob_lijun@sina.com

  • Titanium-based composite coatings reinforced by in situ synthesized TiB and TiC particles were successfully fabricated on Ti6Al4V by laser cladding using Ti-B4C-Al or Ti-B4C-C-Al powders as the precursor materials. The microstructural and metallographic analyses were made by X-ray diffraction (XRD), optical microscope (OM), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). The results show that the coatings are mainly composed of α-Ti cellular dendrites and a eutectic transformation product in which a large number of coarse and fine needle-shaped TiB and a few equiaxial TiC particles are homogeneously embedded. A thin dilution zone with a thickness of about 100 μm is present at the interface, and it consists of a few TiB and TiC reinforcements and a large number of lamella grains growing parallel to the heat flux direction in which a thin needle-shaped microstructure exists due to the martensitic transformation. The microstructural evolution can be divided into four stages: precipitation and growth of primary β-Ti phase, formation of the binary eutecticum β-Ti+TiB, formation of the ternary eutecticum β-Ti+TiB+TiC, and solid transformation from β-Ti to α-Ti.
  • Microstructural evolution of titanium matrix composite coatings reinforced by in situ synthesized TiB and TiC by laser cladding

    + Author Affiliations
    • Titanium-based composite coatings reinforced by in situ synthesized TiB and TiC particles were successfully fabricated on Ti6Al4V by laser cladding using Ti-B4C-Al or Ti-B4C-C-Al powders as the precursor materials. The microstructural and metallographic analyses were made by X-ray diffraction (XRD), optical microscope (OM), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). The results show that the coatings are mainly composed of α-Ti cellular dendrites and a eutectic transformation product in which a large number of coarse and fine needle-shaped TiB and a few equiaxial TiC particles are homogeneously embedded. A thin dilution zone with a thickness of about 100 μm is present at the interface, and it consists of a few TiB and TiC reinforcements and a large number of lamella grains growing parallel to the heat flux direction in which a thin needle-shaped microstructure exists due to the martensitic transformation. The microstructural evolution can be divided into four stages: precipitation and growth of primary β-Ti phase, formation of the binary eutecticum β-Ti+TiB, formation of the ternary eutecticum β-Ti+TiB+TiC, and solid transformation from β-Ti to α-Ti.
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