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RISS 인기검색어
- 검색키워드
- 저자 : C. Sánchez de Rojas Candela (검색결과 3 건)
- 무료
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C. Sánchez de Rojas Candela,A. Riquelme,P. Rodrigo,J. Rams 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
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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Ti6Al4V/SiC Metal Matrix Composites Additively Manufactured by Direct Laser Deposition
C. Sánchez de Rojas Candela,A. Riquelme,V. Bonache,P. Rodrigo,J. Rams 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.12
Nowadays, research on additive manufacturing of Ti6Al4V alloy is growing exponentially but there are just a few studiesabout additive manufacturing of metal matrix composite components. In this work, highly reinforced Ti6Al4V matrix compositeswith SiC particles have been additively manufactured by direct laser deposition (DLD). Ti6Al4V powder and SiCparticles have been deposited layer by layer to form an additive thin wall structure. The geometry, microstructure, and microhardnessof the samples are strongly influenced by the laser scanning speed used during de fabrication process. In addition,the effect of the SiC increment in reinforcement concentrations and the influence of SiC particle sizes in the microstructurehave been evaluated, and the reaction mechanisms have been established. The percentage of reinforcement measured is lowerthan expected due to the reinforcement-matrix reactivity that results in partially dissolved SiC particles and the formationof a TiC and Si5Ti3ring around them. The size and number of particles and reaction products depend on the initial size andpercentage of reinforcement and the DLD scanning speed. The higher the size and percentage of SiC particles and reactionproducts in the matrix, the higher the hardening effect of the composite matrix.
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C. Sánchez de Rojas Candela,A. Riquelme,P. Rodrigo,J. Rams 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.3
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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