Abstract
Cold metal transfer (CMT)-based wire and arc additive manufacturing (WAAM) of Ti-6Al-4V alloy has been investigated to manufacture walls with two different building strategies. This study focuses on the influence of the application of thermal treatments on the resulting microstructure and mechanical properties. Deep microstructural analysis revealed different grades of growth of lamellae α phase after several thermal treatments at different temperatures, which lead to different tensile mechanical properties and better strength and ductility balance compared to the as-built condition. Results are compared with equivalent forged and casting standards and the state of the art for WAAM of Ti-6Al-4V alloy. At temperatures of 920 °C, anisotropy was maintained and elongation increased by 70% while yield strength and UTS was slightly decreased by 8%.
Highlights
Tensile Properties of Ti-6Al-4V PartsWire and arc additive manufacturing (WAAM) offers interesting advantages over conventional manufacturing [1]
wire and arc additive manufacturing (WAAM) allows higher deposition rates comparing to other AM technologies, especially to those classified in the powder bed fusion category
As observed in previous works where deposition rates with different arc welding technologies were compared for Ti-6Al-4V, cold metal transfer (CMT)
Summary
Wire and arc additive manufacturing (WAAM) offers interesting advantages over conventional manufacturing [1]. This is due to a great reduction in the buy-to-fly (BTF) ratio which is considerably smaller than in parts machined from oversized billets. WAAM allows higher deposition rates comparing to other AM technologies, especially to those classified in the powder bed fusion category. In these terms, Ti-6Al-4V is one of the most appealing materials used by the aerospace industry due to its advanced properties such as high strength, low density and outstanding corrosion resistance, among others. As observed in previous works where deposition rates with different arc welding technologies were compared for Ti-6Al-4V, cold metal transfer (CMT)
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