Journal
CERAMICS INTERNATIONAL
Volume 49, Issue 3, Pages 4168-4176Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.09.299
Keywords
Wire arc additive manufacturing; Titanium matrix composite; Network microstructure; Flux-cored wires; Wear resistance
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In this study, a Wire Arc Additive Manufacturing (WAAM) process using flux-cored wire was developed to fabricate Ti6Al4V matrix composites reinforced with TiB and TiC particles. The introduction of reinforcement resulted in the formation of a refined net-basket-dominated (alpha+beta)-Ti matrix and a stable network microstructure. The microhardness of the samples increased with increasing reinforcement fraction, but the wear resistance decreased in the 10 wt% sample due to the reduced ductility.
Titanium matrix composites (TMCs) with ceramic particles exhibit higher hardness, strength, and wear resistance than those of titanium alloys. Wire arc additive manufacturing (WAAM) is a promising method for fabricating large TMC components owing to its high deposition rate and low production cost. In this study, a WAAM process using a flux-cored wire was developed to fabricate components of TiB plus TiC reinforced Ti6Al4V matrix composites. The network microstructure of the reinforcement was obtained through in-situ reactions induced by the B4C and C powders in the flux core. The formation mechanism of the network microstructure was discussed. The effect of the reinforcement fraction (5 and 10 wt%, hereinafter called 5 and 10 wt% samples) on the microstructure and wear resistance of the samples along the deposition direction were investigated. The results showed that the refined net-basket-dominated (alpha+beta)-Ti matrix and stable network microstructure were formed in middle region owing to the introduction of the reinforcement. The microhardness increased by 23% and 35% when the reinforcement fractions were 5 and 10 wt%, respectively. The 10 wt% sample showed reduced wear performance because more cracks appeared as the result of the decreased ductility.
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