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

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Abstract

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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Authors and Affiliations

  1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China

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

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  1. Jun Li
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  2. Zhi-shui Yu
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  3. Hui-ping Wang
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  4. Man-ping Li
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Correspondence to Jun Li.

Additional information

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).

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Li, J., Yu, Zs., Wang, Hp. et al. Microstructural evolution of titanium matrix composite coatings reinforced by in situ synthesized TiB and TiC by laser cladding. Int J Miner Metall Mater 17, 481–488 (2010). https://doi.org/10.1007/s12613-010-0345-1

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  • DOI: https://doi.org/10.1007/s12613-010-0345-1

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