Mechanical Properties of a Laser Deposited Spherical Ti4822 Alloy

A crack-free cube was manufactured by depositing spherical GE Ti4822 alloy powder using a laser direct metal deposition technique. Tensile specimens were wire cut and tested for tensile properties. Three kinds of specimen were tested: the as-built and those that were heat treated in an argon rich environment at 1200 degrees C and 1400 degrees C and oven cooled. The results showed that the as-built samples had high UTS (440.68 MPa) and very poor elongation (0.11%) while samples that were heat treated at 1200 degrees C and 1400 degrees C had UTS of 382.95 MPa and 297.60 MPa, respectively. All samples lacked plasticity. This study concluded that a coarse-grained fully lamellar microstructure had low tensile strength which would suggest moderate toughness and ductility at room temperature.