Abstract
Non-isothermal forward extrusions of cast γ-TiAl (Ti-49.5Al-2.5Nb-1.1Mn, at%) were performed with billet temperatures of 1050, 1150, and 1225°C and a die and container temperature of 260°C. The billets were canned using 304 stainless steel tubing. Finite-element analysis indicates that rapid heat loss occurs from the canned billet to the die during the extrusion process. The temperature gradient in the billet produces non-uniform microstructure. A technique was developed to insulate the billet with layers of 0.050 inch (1.27 mm) thick silica fabric. The use of an insulator reduces billet heat loss during its transfer from furnace to press and during the extrusion process. Differences in microstructure and mechanical properties of the extrusions performed with and without the silica insulation were investigated and compared.
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