Carrying Gas Influence and Fabrication Parameters Impact in 3D Manufacturing of In Situ TiN-Ti Composites by Direct Laser Deposition

다국어 초록 (Multilingual Abstract)

The difficulty of getting a correct distribution of the reinforcement in the metal matrix and the complexity for achievinga good-metallurgy matrix-reinforcement bonding has limited the development of additive manufacturing of metal matrixcomposites. This research proposes the use of a reactive atmosphere during the fabrication process to obtain titanium matrixcomposites reinforced with TiN. The relation between the carrying gas and the process parameters used with the presence ofporous and defects, the microstructure, and microhardness has been obtained. Nitrogen was used as the carrying gas of thetitanium powder. Under laser irradiation, the particles melt and react with nitrogen, resulting in the formation of a titaniummatrix composite highly reinforced with TiN. The composite obtained had a microhardness increase between 50 and 100%in comparison with titanium samples fabricated in the same conditions in an argon atmosphere. Three reaction mechanismshave been proposed to take place in the microstructure, depending on the amount of nitrogen in the titanium particles, andits diffusion in them during the manufacture.

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