Understanding key failure mechanisms and material anomalies is one of the main challenges for an accelerated certification of additive manufactured parts. In this paper, the response to high velocity impact of Ti-6Al-4V printed by direct metal laser sintering was investigated and compared with wrought material. Taylor impact test at different impact velocities were performed with the scope to determine the velocity at onset damage development. Results show that such velocity is 57% lower than that of wrought material. Microscopy investigation on recovered samples reveals that the presence of initial voids in the microstructure, resulting from the printing process, reduces the shear resistance anticipating the formation of shear bands that is the main mechanism controlling fracture at high deformation rates.
Preliminary investigation on impact resistance of additive manufactured Ti-6Al-4V
Testa G.
;Iannitti G.
2018-01-01
Abstract
Understanding key failure mechanisms and material anomalies is one of the main challenges for an accelerated certification of additive manufactured parts. In this paper, the response to high velocity impact of Ti-6Al-4V printed by direct metal laser sintering was investigated and compared with wrought material. Taylor impact test at different impact velocities were performed with the scope to determine the velocity at onset damage development. Results show that such velocity is 57% lower than that of wrought material. Microscopy investigation on recovered samples reveals that the presence of initial voids in the microstructure, resulting from the printing process, reduces the shear resistance anticipating the formation of shear bands that is the main mechanism controlling fracture at high deformation rates.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
