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• This is the author's version of a work that was accepted for publication in the Journal of Materials Processing Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication.A definitive version was subsequently pub- enhanced machinability generating short chips during metal cutting, which prevents entanglement with cutting tools improving productivity. To further enhance the machinability of this material, a novel hybrid machining technique called ultrasonically assisted turning (UAT) was used. Experimental investigations were carried out to study the machinability, chip shapes, cutting forces, temperature in the process zone and surface roughness for conventional and ultrasonically assisted turning of both alloys. UAT shows improved machinability with reduced nominal cutting forces, improved surface roughness of the machined workpiece and generation of shorter chips when compared to conventional machining conditions.

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The mechanism behind chip segmentation of titanium alloys is still unclear. Experimentally, different kinds of deformation patterns are observed. In this paper we perform a finite element analysis where chip segmentation is done by introducing cracks from the chip surface into the material. A fine mesh is used within the segments, allowing a high resolution of the occurring strain gradients. Because of stress concentration at the crack tip, adiabatic shear bands can form and lead to a strongly segmented chip with pronounced deformation in the crack region. Depending on the cracking parameters, different deformation patterns at the crack flanks are observed.

No abstract