METHOD FOR THERMOMECHANICAL TREATMENT OF CAST (γ+α2)-INTERMETALLIC ALLOYS BASED ON TITANIUM ALUMINIDE γ-TiAl Russian patent published in 2017 - IPC C22F1/16 B21B3/00 B21J5/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, specifically to metal forming and can be used for production from said materials of workpieces, semi-finished products and articles with a specified structure, used in aerospace and automobile equipment. Method for thermomechanical treatment of workpieces from cast (γ+α₂)-intermetallic alloys based on γ-TiAl involves heating and deformation. Prior to heating and deformation workpiece is subjected to annealing at temperature within range of T_α-100 °C to T_α+100 °C for at least 10 minutes, where T_α is temperature of α↔γ transformation. Method then includes cooling workpiece at a rate of 5–100 °C/s to room temperature, heating is performed in (γ+α₂)-phase region to temperature which is 5–200 °C below temperature of eutectoid transformation and deformation under isothermal conditions at a rate of deformation of 10^-1-10^-4 C^-1 and deformation degree e not less than 0.7, followed by cooling workpiece at a rate of 5–100 °C/s to room temperature.

EFFECT: reduced flow stress at deformation, providing a fine-grained structure.

1 cl, 5 dwg, 11 ex