Abstract:
The impact toughness of as-built (AB) and stressed-relieved (SR) direct metal
laser sintering-produced Ti6Al4V (ELI) was investigated using the standard
Charpy impact test over the temperature range of 130 C to 250 C. Stressrelieving
heat treatment was conducted at 650 C for a soaking period of 3 h in
argon gas atmosphere. The results showed improvements in the impact
toughness after stress-relieving heat treatment. Stress relieving also shifted
the established ductile-to-brittle transition temperature to lower temperatures.
Comparative analysis of the impact toughness values for AB and SR
specimens at ambient temperature showed them to be 48% and 22% lower
than recommended values for use in aircraft structures, respectively.
