DOI: 10.5176/2251-1857_M318.20
Authors: Mehdi Heidari, Jiwang Yan
Abstract: Porous titanium is attracting great attention in medical applications due to unique material properties. Although porous titanium components fabricated close to final products, it requires further machining processes to improve the surface quality. In this work, both micro and nanometer cutting scale in machining of porous titanium and pure titanium using single-crystal diamond tools were investigated. The results demonstrated that the pore size significantly changes chip formation and machined surface in porous titanium cutting. The smaller pores were closed due to the shear deformation in chip formation process and machined surface. In contrast, big pores caused craters on the machined surface and segmentation of chips and protruding lamella, especially at a large undeformed chip thickness. The results also revealed that there were phase transformations, and hardness enhancement on the machined surface during process depended on cutting scale.
Keywords:porous titanium; diamond turning; cutting scale; pore size; phase transformation; chip formation
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