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Heat treatment methods to suppress recrystallization of 3D printed or welded single crystal superalloys

A heat treatment method and high-temperature alloy technology, applied in the field of additive manufacturing and metal heat treatment, can solve problems such as large residual stress, achieve the effect of improving microstructure, improving mechanical properties, and inhibiting recrystallization

Active Publication Date: 2020-07-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, additively manufactured parts are subject to multiple "rapid heating-rapid cooling" thermal cycles, and the heat in the subsequent cladding process is not enough to completely eliminate the thermal stress of the cladding layer, so there is a large residual stress after the sample or part is cooled.

Method used

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  • Heat treatment methods to suppress recrystallization of 3D printed or welded single crystal superalloys
  • Heat treatment methods to suppress recrystallization of 3D printed or welded single crystal superalloys
  • Heat treatment methods to suppress recrystallization of 3D printed or welded single crystal superalloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This example is an electron beam 3D printing single crystal superalloy. The necessary temperature and necessary time for stress relief annealing are determined in advance as 1100°C / 8 hours, and it is treated according to the heat treatment method described in this patent, namely:

[0069] (a) Clean up the alloy powder adhered to the surface of the 3D printed single crystal superalloy, and remove the surface miscellaneous crystals by grinding with a grinding wheel.

[0070] (b) Perform stress relief annealing, raise the temperature to 1100°C, take it out after 8 hours of heat preservation, and cool to room temperature under the protection of nitrogen.

[0071] (c) Standard heat treatment is performed.

[0072] The treated 3D printed single crystal superalloy slices were prepared for tissue observation and electron backscatter diffraction detection. Such as image 3 As shown, the 3D printed single crystal superalloy sample did not recrystallize after heat treatment accord...

Embodiment 2

[0074] This example is a laser 3D printed single crystal superalloy, and the parameters of the stress relief annealing heat treatment are the same as those in Example 1, which is 1100°C / 8 hours. It is processed by the heat treatment method described in this patent, that is:

[0075] (a) Clean up the alloy powder adhered to the surface of the laser 3D printed single crystal superalloy, and sand the surface to remove the miscellaneous crystal layer.

[0076] (b) Stress-relief annealing is performed on the laser 3D printed single crystal superalloy, and the temperature is raised to 1100 ° C for 8 hours.

[0077] (c) Leave the laser 3D printed single crystal superalloy after stress relief annealing in the heat treatment furnace, change the furnace temperature, and perform standard heat treatment.

[0078] The treated 3D printed single crystal superalloy slices were prepared for tissue observation and electron backscatter diffraction detection. It was found that the 3D printed sin...

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Abstract

The invention discloses a heat treatment method for inhibiting recrystallization of a 3D printed or welded single crystal superalloy, and belongs to the field of additive manufacturing and metal heattreatment. The method comprises the following steps of removing residual alloy powder and an impurity crystal layer on the surface of the 3D printed or welded single crystal superalloy, performing stress relief annealing on the 3D printed or welded single crystal superalloy to release internal residual stress on the premise of no recrystallization, performing standard heat treatment on the 3D printed or welded single crystal superalloy subjected to stress relief annealing after heat preservation for a necessary period of time at a necessary temperature, so that the strengthening gamma' phase of the 3D printed or welded single crystal superalloy grows to a predetermined size and is orderly arranged. The method can be use for improving the structure and performance of the 3D printed or welded single crystal superalloy, and subsequent heat treatment of the 3D printed or welded single crystal superalloy can be developed based on the method.

Description

technical field [0001] The invention belongs to the field of additive manufacturing and metal heat treatment, in particular to a heat treatment method for suppressing the recrystallization of a 3D printed or welded single crystal superalloy. Background technique [0002] The most direct and effective way to develop high-thrust, high-efficiency, and low-fuel-consumption aeroengines is to increase the gas inlet temperature before the turbine, and the increase in temperature is mainly limited by the temperature-bearing capacity of the turbine blades. The temperature of polycrystalline blades prepared by early powder deformation alloys is between 700 and 900°C, and the service temperature of polycrystalline blades prepared by forging technology can reach 950°C; 980°C; single crystal blades completely eliminate the adverse effects of grain boundaries on mechanical properties in high-temperature environments, and the service temperature can reach 1050-1100°C. [0003] However, si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10C22C19/05B22F3/24
CPCB22F3/24B22F2003/248C22C19/057C22F1/10
Inventor 陈凯黄润秋
Owner XI AN JIAOTONG UNIV
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