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Heat treatment method of single crystal nickel-based superalloy after cold deformation

A technology of nickel-based superalloy and heat treatment method, which is applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., and can solve problems such as heavy workload

Active Publication Date: 2020-10-23
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you still choose to use the experimental method to determine the solid solution temperature, then the workload is very large

Method used

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  • Heat treatment method of single crystal nickel-based superalloy after cold deformation
  • Heat treatment method of single crystal nickel-based superalloy after cold deformation
  • Heat treatment method of single crystal nickel-based superalloy after cold deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Prepare a standard cylindrical sample with an aspect ratio of 2:1. The deformation mode is compression at room temperature, and the plastic deformation of the sample is 6.5%;

[0038]Step 2: Determine that the temperature below the standard solution temperature of the single crystal nickel-based superalloy is 150°C as the low-speed heating recovery heat treatment starting temperature of 1150°C, and the termination temperature is the standard solution temperature of the single crystal nickel-based superalloy of 1300°C;

[0039] Step 3: The heating rate is determined by different temperature zones. Between the start temperature and the end temperature, it is divided into a low temperature range and a high temperature range. According to the high temperature range is 0.618 times the temperature difference (golden section point) of the low temperature range, the low temperature range is 1150-1243 ° C, and the heating rate is 0.15 ° C / min, the high temperature rang...

Embodiment 2

[0044] Step 1: Prepare a standard cylindrical sample with an aspect ratio of 2:1. The deformation mode is compression at room temperature, and the plastic deformation of the sample is 6.5%;

[0045] Step 2: Determine that the temperature below the standard solution temperature of the single crystal nickel-based superalloy is 180°C as the low-speed heating recovery heat treatment starting temperature of 1120°C, and the end temperature is the standard solution temperature of the single crystal nickel-based superalloy of 1300°C;

[0046] Step 3: The heating rate is determined by different temperature zones. Between the start temperature and the end temperature, it is divided into a low temperature range and a high temperature range. According to the high temperature range is 0.618 times the temperature difference (golden section point) of the low temperature range, the low temperature range is 1120-1230 ° C, and the heating rate is 0.5 ° C / min, the high temperature range is 123...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10C21D9/00C22F1/02
CPCC21D9/0068C22F1/006C22F1/02C22F1/10
Inventor 陈凯林思聪朱文欣
Owner XI AN JIAOTONG UNIV
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