Influence of chemical machining on axial fatigue behaviour of electron beam melted Ti6Al4V parts

Effect of energy input on fatigue crack growth behavior of titanium alloy Ti6Al4V made by WAAM‐CMT

“…Despite WAAM processes being characterized by a poorer surface finish, thus requiring relevant post-process machining to arrive at the final geometry if compared to powder-based AM, they still could be the best choice to produce semifinished parts. In other terms, even if powder-based AM parts need a series of operations aimed to meet the final surface quality requirements such as finishing operations [7][8][9] , aimed also to improve the mechanical properties of the parts [10][11][12] , the resolution of certain features in terms of scale and geometrical characteristics are closer to the final ones with respect to WAAM. However, from the point of view of saving costs both in terms of raw material purchase and reducing waste, WAAM technologies could be quite attractive in many industrial contexts, with a special interest in the aerospace, energy, and machinery sectors.…”

“…Among the latter, Ti6Al4V titanium alloy could represent a very interesting case study: this α + β alloy is well known for its outstanding mechanical properties and it is used in plenty of sectors 27 , but in relation to the traditional manufacturing paradigms it implies huge costs in terms of produced waste and machining difficulties so that, for instance, in the case of the aerospace sector it implies a high buy-to-fly ratio 28 . Consequently, the research interests focused on the processability of the Ti6Al4V alloy through the mentioned AM techniques increased substantially, as witnessed by the large number of experimental activities pursued to emphasize many of the AM production aspects [10][11][12][29][30][31][32] . In the WAAMspecific context, this premise makes it easy to understand why the CMT process could represent an extremely attractive alternative to the traditional CNC machining of Ti6Al4V parts, with enormous potential benefits in terms of costs and lead time.…”