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• Dual-WAAM of a Ti-Fe alloy with eutectoid composition (Ti-Fe15(wt.%)) successfully performed. • As-built microstructure consists of large grains with predominantly β-phase. • On heat treatment fine-scaled α-phase is precipitated associated with an increase in hardness. • Thermal analysis revealed that this decomposition reaction is kinetically controlled by Fe diffusion in the β-phase. • Neither ω- nor intermetallic TiFe phase are observed. Titanium alloys are among the most relevant structural materials for aerospace applications; they can be processed using various additive manufacturing (AM) techniques including wire-based AM. However, conventional alloy systems, such as Ti-6Al-4V, are, from a metallurgical perspective, not optimized for AM. Here, we investigate the effects of alloying Ti with Fe using dual-WAAM to improve the understanding of the effects of the addition of β-eutectoid forming elements on the microstructure. A structural characterization of the material after processing reveals the microstructure in the as-built condition to primarily consist of β-phase from which α-phase is precipitated upon a heat-treatment, resulting in a substantial increase in hardness. [ABSTRACT FROM AUTHOR]