Microstructural evolution of titanium matrix composite coatings reinforced by in situ synthesized TiB and TiC by laser cladding

Jun Li, Zhi-shui Yu, Hui-ping Wang, Man-ping Li

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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://dx.doi.org/10.1007/s12613-010-0345-1
    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://dx.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

    • School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China

    基金项目: 

    This work was financially supported by the Shanghai Science and Technology Development Foundation (No.08QA14035), the Special Foundation of Shanghai Education Commission for Nano-Materials Research (No.0852nm01400), and the Crucial Project of Shanghai Science and Technology Commission (No.08520513400).

      通信作者:

      Jun Li E-mail: jacob_lijun@sina.com

    中文摘要

    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 Affilications

      • School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China

    • Funds: 

      This work was financially supported by the Shanghai Science and Technology Development Foundation (No.08QA14035), the Special Foundation of Shanghai Education Commission for Nano-Materials Research (No.0852nm01400), and the Crucial Project of Shanghai Science and Technology Commission (No.08520513400).

    • Received: 21 August 2009; Revised: 04 October 2009; Accepted: 12 October 2009;
    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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