Heat treatment method single-crystal nickel-based high-temperature alloy after cold deformation

Abstract

The invention discloses a heat treatment method a single-crystal nickel-based high-temperature alloy after cold deformation. The method comprises the following steps that a cylindrical sample of the single-crystal nickel-based high-temperature alloy is prepared, wherein the sample is compressed at room temperature, the plastic deformation ainstall of the single-crystal nickel-based high-temperature alloy is 6.5% or within, and the starting temperature of the low-speed heating recovery heat treatment of the single-crystal nickel-based high-temperature alloy is determined to be 150-180 DEG C below a standard solid solution temperature, the termination temperature is the standard solid solution temperature of the single-crystal nickel-based high-temperature, the part between the starting temperature and the termination temperature is divided into a low temperature interval and a high temperature interval, the temperature difference value of the high temperature interval is a predeterminedmultiple of the temperature difference value of the low temperature interval, the sample is subjected to the recovery heat treatment according to the temperature rise rate, after the temperature reaches the termination temperature, the sample is air cooled to room temperature and taken out after the time required for the solid solution heat treatment, and the taken-out sample is subjected to microscopic tissue morphology characterization by using a scanning electron microscope to detect the size and shape of the precipitated reinforced phase gamma' phase in the sample and determine the occurrence of no recrystallization texture.

Description

technical field

[0001] The invention belongs to the technical field of metal heat treatment, in particular to a heat treatment method for a single crystal nickel-based superalloy after cold deformation. Background technique

[0002] Cast nickel-based superalloys have been developed since the 1950s, and their microstructures have developed from equiaxed crystals to directionally solidified single crystals. Compared with equiaxed crystals, the performance of high-temperature creep, high-temperature fatigue and corrosion / oxidation resistance of single crystals has been improved several times. It is the "heart" of high-thrust aero-engines—the material of choice for high-pressure turbine blades. Although it integrates many excellent mechanical properties, because the single crystal nickel-based superalloy often needs to go through dozens of processes when it is manufactured into a finished product, it is very susceptible to the influence of external stress: a large number of disl...

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