Effect of annealing processing on microstructure and properties of Ti-6Al-4V alloy by powder injection molding

Ti6A14V alloy parts were prepared by metal injection molding. Brown parts were densified at 1 200–1 260°C for 2–4 h in vacuum atmosphere. The as-sintered specimens were treated through Hot-Isostatic Pressure(HIP) at 960 °C and 140 MPa. Ti6A14V alloy compacts were annealed at 720–760 °C for 1 h. The results show that binder in the parts can be removed by solvent debinding and thermal debinding process. Ti6A14V alloy has an uniform duplex microstructure with many equiaxed α grains and a little β grains. When the annealing temperature is higher than 800 °C, Ti6A14V alloy has lower mechanical properties. After solution treatment and aging, a typical martensite microstructure can be achieved.