METHOD FOR THERMOMECHANICAL PROCESSING OF SEMI-FINISHED PRODUCTS FROM HEAT-STRENGTHENED Al-Cu-Mg-Ag ALLOYS

摘要

FIELD: metallurgy.;SUBSTANCE: invention relates to metallurgy, namely to thermomechanical processing of semi-finished products from heat-strengthened Al-Cu-Mg-Ag alloys to improve mechanical properties and heat resistance of finished articles used in modern gas turbine engines of ground and aircraft applications. Method of thermomechanical treatment of semi-finished products from heat-strengthened Al-Cu-Mg-Ag alloys involves homogenization annealing of cast semi-finished product at temperature from 450 to 510 °C for 10–25 hours, mechanical treatment, hot deformation by equal-channel angular pressing at temperatures of 400–425 °C with total true degree in range from 1 to 2, deformed semi-products annealing at temperature not higher than 515 °C for not more than 10 hours, quenching from the annealing temperature into room temperature water with subsequent artificial aging for maximum strength in the temperature range of 190–250 °C for 0.5 to 2.5 hours.;EFFECT: invention improves mechanical properties and heat resistance properties of finished articles from heat-strengthened aluminum alloys of the Al-Cu-Mg-Ag system.;1 cl, 1 tbl, 4 ex