HOT UPSET FORGING OF TI3 AL BASE SUPERALPHA-2 ALLOY

Samples of plasma melted Superalpha 2 have been forged after heating t o either the alpha + beta or the beta phase field. Two die temperature s and an initial strain rate of 10 s-1 were used. It has been found th at cast microstructures were refined by all forging treatments used an d increasing the forging temperature increased the amount of recrystal lisation. The flow stress during forging decreased from approximately 212 MN m-2 for alpha + beta forging to 146 MN m-2 for beta forging. Th e room temperature tensile properties for all forged samples were supe rior to those of the as cast material, with the best combination of pr operties obtained using the lower of the two die temperatures and forg ing in the alpha + beta phase field, although the differences between the variously forged samples were not large.