Single-crystal nickel-based high-temperature alloy cold deformation restoring method

Abstract

The invention discloses a single-crystal nickel-based high-temperature alloy cold deformation restoring method. The method comprises the following steps that the slip band tissue morphology of the single-crystal nickel-based high-temperature alloy after cold deformation is determined, and the position is marked, wherein the morphology features of a strengthening phase gamma phase of the nickel-based high-temperature alloy in a deformed concentrated band in a particular direction become pressed and subject to dislocation cutting, and the dislocation cutting direction is the diagonal direction along the square block gamma phase; the restoring temperature is determined as the first aging temperature of the single-crystal nickel-based high-temperature alloy; the safe heat preservation time isdetermined based on the heat preservation time of the sliding band tissue of the mark position at the restoring temperature; the cold-deformed single-crystal nickel-based high-temperature alloy samples are prepared, half of the samples are subjected to restoring and standard solid solution heat treatment, and the other half of the samples are subjected to standard solid solution heat treatment only; and the range of the recoverable plastic deformation of the single-crystal nickel-based high-temperature alloy subjected to heat treatment is determined.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, in particular to a cold deformation recovery method of a single crystal nickel-based superalloy. Background technique [0002] Superalloys are a class of high temperature alloys that can also have good oxidation resistance and thermal corrosion resistance at high temperatures of 600-1200 ° C. At the same time, they can also withstand certain stress and have excellent high temperature strength, fracture toughness, fatigue and durability. They are especially suitable for Used as a critical hot-end component in the manufacture of advanced aero-engines. Nickel-based superalloys are currently the fastest-growing and most diverse superalloys. After more than half a century of development, nickel-based superalloys have developed from deformed superalloys to cast superalloys, and then developed from directionally solidified columnar crystals to single crystal directionally solidified crysta...

AI Technical Summary

Problems solved by technology

After analysis and detection, it is found that it is because of the small plastic deformation introduced in the blade part due to inadvertent bumping during the assembly process of the high-pressure turbine blade. Or evolve into a recrystallized structure during service use, resulting in accidents

Images