METHOD OF MANUFACTURE OF HIGH-ALLOYED HIGH-TEMPERATURE NICKEL ALLOY Russian patent published in 2005 - IPC

FIELD: metallurgy; manufacture of disks for gas-turbine engines.

SUBSTANCE: proposed method includes annealing of ingots, cooling them in air, preliminary deformation by pressing for obtaining the blank, final deformation in two-phase zone of nickel alloy and heat treatment; annealing of ingot is performed at three stages: at first stage ingot is heated to temperature which exceeds temperature of complete dissolving of γ-phase by no more than 400°C; ingot is kept at this temperature for at least 6 h and then is cooled to temperature of second stage which is below temperature of complete dissolving of γ-phase by 20-50°C and is kept at this temperature for at least 3 h, after which it is cooled to temperature of third stage which is below temperature of complete dissolving of γ-phase and is kept at this temperature for at least 3 h, after which it is cooled at rate of 20-60°C/h to temperature which is below temperature of complete dissolving of γ-phase by 200-300°C; preliminary deformation is performed at temperature which is below temperature of complete dissolving of γ-phase by 70-100°C and final deformation is performed at rate no less than 10^-4 s^-1.

EFFECT: stable and homogeneous level of properties of articles for gas-turbine engine hot duct.

5 cl, 2 dwg, 4 tbl, 1 ex