Laser Cladding of an In Situ Synthesized TiB and TiC Reinforced Titanium Matrix Composite Coating on Ti6Al4V

Jun Li; Zhi Shui Yu; Hui Ping Wang

doi:10.4028/www.scientific.net/AMR.97-101.3861

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 97-101Laser Cladding of an In Situ Synthesized TiB and...

Laser Cladding of an In Situ Synthesized TiB and TiC Reinforced Titanium Matrix Composite Coating on Ti6Al4V

Abstract:

A titanium matrix composite coating reinforced by in situ synthesized TiB and TiC was deposited on Ti6Al4V by laser cladding. Microstructural analyses were made by means of X-ray Diffraction (XRD), Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and Electron Probe Micro-Analysis (EPMA). The solidification process was also discussed in detail. The results show that the coating is composed of -Ti cellular dendrites and a eutectic in which a large number of needle-shaped TiB whiskers and a few equiaxial TiC particles are embedded. A thin dilution zone with a thickness of 50 m is observed at the interface, and consists of a few TiB and TiC and a large number of lamella grains in which a thin needle-shaped martensitic microstructure is exist. The solidification process could be divided into four stages: nucleation and growth of primary -Ti phase, precipitation of a binary eutectic -Ti+TiB, precipitation of a ternary eutectic -Ti+TiB+TiC and solid transformation from -Ti to -Ti.

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Periodical:

Advanced Materials Research (Volumes 97-101)

Pages:

3861-3865

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.97-101.3861

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Online since:

March 2010

Authors:

Jun Li, Zhi Shui Yu, Hui Ping Wang

Keywords:

Coating, In Situ Synthesis, Laser Cladding, Microstructure

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