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Improvement physical and mechanical properties of Ti-6Al-4V alloy processed by selective laser melting
Russian version
Gryaznov M. Yu.1, Shotin S. V.1, Chuvil’deev V. N.1, Semenycheva A. V.1, Sysoev A. N.1, Piskunov A. V. 1
1Lobachevsky University of Nizhny Novgorod, Nizhny Novgorod, Russia
Email: gryaznov@nifti.unn.ru, shotin@nifti.unn.ru, chuvildeev@nifti.unn.ru, semenycheva@nifti.unn.ru, sysoev@nifti.unn.ru, avpiskunov@nifti.unn.ru
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The physical and mechanical properties of Ti-6Al-4V titanium alloy processed by selective laser melting were studied. It is shown that the strength characteristics under optimal fusion conditions (strength limit 1300 MPa and conditional yield strength 1250 MPa) are 30% higher than the standard values for this alloy made using traditional technologies (rolling, forging). The reason for the increase in the strength characteristics of the Ti-6Al-4V alloy is the presence of a finely dispersed martensitic α +β structure formed due to high crystallization rates realized during selective laser melting. At the same time, the optimization of scanning tactics allows to achieve elongation to failure of 11% by reducing porosity and the level of internal stresses. Keywords: titanium alloy Ti-6Al-4V, additive technologies, selective laser melting, density, strength, plasticity, microstructure, implants for surgery.
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