Production of components with a high load capacity used in aircraft engines or stationary gas turbines comprises preforming encapsulated titanium-aluminum blanks, shaping, solution annealing and cooling off rapidly

摘要

Production of components with a high load capacity comprises: preforming encapsulated TiAl blanks of a globular structure by isothermal primary forming in the alpha and gamma or alpha phase area; shaping the preforms by isothermal secondary forming with dynamic recrystallization in the alpha and gamma or alpha phase area; adjusting the microstructure by solution annealing the components in the alpha phase; and cooling them off rapidly. Preferred Features: The isothermal primary forming is carried out by forging or extruding in the gamma or alpha phase area at 1000-1340[deg]C. Forming is carried out in a heated tool made from molybdenum or graphite. The blank is a TiAl based alloy containing (in wt.%) 43-47 Al, 5-10 Nb, maximum 1.0 B, maximum 0.5 C and a balance of titanium.