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Materials 2017, 10(3), 281;

Microstructure Evolution of TiC Particles In Situ, Synthesized by Laser Cladding

School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Author to whom correspondence should be addressed.
Academic Editor: Rui Vilar
Received: 21 January 2017 / Revised: 5 March 2017 / Accepted: 6 March 2017 / Published: 11 March 2017
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In this paper, a TiC reinforcement metal matrix composite coating is produced using nickel and graphite mixing powder on the surface ofTi-6Al-4V alloy by laser radiation. The microstructure of the coatings is investigated by XRD, SEM and EDS. Results show that most of the TiC phase is granular, with a size of several micrometers, and a few of the TiC phases are petals or flakes. At the cross-section of the coatings, a few special TiC patterns are found and these TiC patterns do not always occur at the observed cross-section. The even distribution of the TiC phase in the coatings confirms that the convection of the laser-melted pool leads to the homogenization of titanium atoms from the molten substrate, and carbon atoms from the preplace powder layer, by the mass transfer. The characteristics of the TiC pattern confirm that the morphology and distribution of the primary TiC phase could be influenced by convection. Two main reasons for this are that the density of the TiC phase is lower than the liquid melt, and that the primary TiC phase precipitates from the pool with a high convection speed at high temperature. View Full-Text
Keywords: laser cladding; microstructure; TiC; metal matrix composite coating laser cladding; microstructure; TiC; metal matrix composite coating

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Liu, Y.; Ding, J.; Qu, W.; Su, Y.; Yu, Z. Microstructure Evolution of TiC Particles In Situ, Synthesized by Laser Cladding. Materials 2017, 10, 281.

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