Modeling of interstitials diffusion during debinding/sintering of 3D printed metallic filaments: Application to titanium alloy and its embrittlement

Parts made by metal additive manufacturing processes assisted sintering suffer from embrittlement due to binder/powders interactions. Using a core-shell approach, we modelled the diffusion of carbon and oxygen binder into metallic powders. The model was assessed measuring interstitials content upon various debinding/sintering steps. diffusion/precipitation phenomena during these non-isothermal treatments lead either saturated solid solution or precipitation titanium carbides. consequences on mechanical behavior single 3D printed filaments were quantified bending tests, highlighting transition brittle ductile fracture depending debinding parameters. This approach can be applied understand role fast diffusing interstitial elements powders systems in order optimise chemical composition properties parts.