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A method to eliminate 3D nickel -based high -temperature alloy cracks

A nickel-based superalloy, 3D printing technology, applied in the direction of improving energy efficiency, metal processing equipment, process efficiency, etc., can solve the problems of high residual stress of formed parts, unable to suppress cracks, poor welding performance, etc., to achieve the elimination of 3D Effects of printing cracks, reducing crack sensitivity, and improving compositional and organizational uniformity

Active Publication Date: 2021-11-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the 3D printing forming process, the temperature gradient is large, the cooling rate is fast, and repeated remelting leads to high residual stress in the formed part, which is prone to deformation and cracking, which brings challenges to 3D printing and forming high-quality parts, especially high Al and Ti content The γ′ phase precipitation strengthens nickel-based superalloys, poor welding performance, and cracking have become the most prominent problems in 3D printing of such alloys
However, the above methods cannot suppress the problems such as cracks generated during printing and / or subsequent heat treatment of 3D printed nickel-based superalloy parts

Method used

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  • A method to eliminate 3D nickel -based high -temperature alloy cracks
  • A method to eliminate 3D nickel -based high -temperature alloy cracks
  • A method to eliminate 3D nickel -based high -temperature alloy cracks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The method of the present invention is used for the following René 104 nickel-based superalloy, and the added mass fraction is 0.08% rare earth Sc element, and the alloy weight percent is:

[0080] 20.6Co~13Cr~3.4Al~3.9Ti~3.8Mo~2.1W~2.4Ta~0.9Nb~0.05Zr~0.03B~0.04C~0.08Sc~the balance is Ni, and argon gas is used after preparing the master alloy of the alloy Atomized rapid solidification powder, through air classification and ultrasonic vibrating sieve powder sieve 15 ~ 53μm alloy powder.

[0081] Apply the present invention to SLM forming René 104 nickel-based superalloy, first dry the sieved René 104 nickel-based superalloy powder in a vacuum oven at 120°C for 4 hours, heat the substrate to 170°C, and dry the dried powder Put it into the powder supply cylinder and spread the powder, and feed argon or nitrogen into the working chamber until the oxygen content is lower than 100ppm. After entering the printing process, the steps of powder spreading and laser scanning powde...

Embodiment 2

[0086] The method of the present invention is used for the following René 104 nickel-based superalloy, and the addition mass fraction is 0.12% rare earth Y element, and the alloy weight percentage is:

[0087] 20.6Co~13Cr~3.4Al~3.9Ti~3.8Mo~2.1W~2.4Ta~0.9Nb~0.05Zr~0.03B~0.04C~0.12Y~The balance is Ni, and helium is used after preparing the master alloy of the alloy Atomized rapid solidification powder, through air classification and ultrasonic vibrating sieve powder sieve 15 ~ 53μm alloy powder.

[0088] Apply the present invention to SLM forming René 104 nickel-based superalloy, first dry the sieved René 104 nickel-based superalloy powder in a vacuum oven at 120°C for 4 hours, heat the substrate to 170°C, and dry the dried powder Put it into the powder supply cylinder and spread the powder, and feed argon or nitrogen into the working chamber until the oxygen content is lower than 100ppm. After entering the printing process, the steps of powder spreading and laser scanning powd...

Embodiment 3

[0093] The method of the present invention is used for the following René 104 nickel-based superalloy, the addition mass fraction is 0.06% rare earth Sc element and 0.08% rare earth Y element, and the alloy weight percent is:

[0094] 20.6Co~13Cr~3.4Al~3.9Ti~3.8Mo~2.1W~2.4Ta~0.9Nb~0.05Zr~0.03B~0.04C~0.06Sc~0.08Y~the balance is Ni, after preparing the master alloy of the alloy Argon atomization is used for rapid solidification to produce powder, and alloy powder of 15-53 μm is sieved through airflow classification and ultrasonic vibrating sieve powder.

[0095] Apply the present invention to SLM forming René 104 nickel-based superalloy, first dry the sieved René 104 nickel-based superalloy powder in a vacuum oven at 120°C for 4 hours, heat the substrate to 170°C, and dry the dried powder Put it into the powder supply cylinder and spread the powder, and feed argon or nitrogen into the working chamber until the oxygen content is lower than 100ppm. After entering the printing proce...

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Abstract

The invention provides a method for eliminating cracks in 3D printing nickel-based superalloys, and belongs to the technical field of additive manufacturing of superalloys. Aiming at the problem that 3D printing of nickel-based superalloys strengthened by γ′ phase precipitation is prone to cracks, this invention proposes for the first time that rare earth micro-alloying is carried out with an appropriate amount of rare earth to reduce the cracking sensitivity of 3D printing of nickel-based superalloys strengthened by γ′ phase precipitation and widen the 3D The printing process window can suppress the occurrence of 3D printing cracks, greatly improve the strength and plasticity of formed parts, and effectively prevent the formation of cracks in subsequent processing such as inter-process storage cracking and subsequent heat treatment cracking. The γ′ phase precipitation strengthened nickel-based superalloy René 104 prepared by this method has no cracks, the density exceeds 99.4%, the yield strength and tensile strength reach 935MPa and 1256MPa, respectively, and the elongation exceeds 14.0%.

Description

technical field [0001] The invention provides a method for eliminating cracks in 3D printing nickel-based superalloys, and belongs to the technical field of additive manufacturing of superalloys. Background technique [0002] The γ′ phase precipitation strengthening of nickel-based superalloys is one of the major breakthroughs in the field of material science, and its strengthening phase is an ordered and coherent intermetallic compound such as γ′-Ni 3 (Al, Ti), usually prepared by casting, deformation processing, or powder forming technology, are widely used in advanced aero-engines. However, these techniques cannot directly form parts with complex shapes. 3D printing, or additive manufacturing technology, can directly generate three-dimensional parts with near-net-shape dimensions layer by layer from three-dimensional computer-aided design data, and has unique advantages in the preparation of high-performance components with complex shapes. Alloy, stainless steel and nic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C30/00B22F9/08B22F9/14B22F10/28B22F10/64B33Y10/00B33Y40/20B22F1/00B33Y70/00
CPCC22C19/056C22C30/00B22F9/082B22F9/14B22F3/24B33Y70/00B22F2009/0824B22F2003/248B22F2009/0848B22F1/065Y02P10/25
Inventor 刘祖铭魏冰农必重吕学谦任亚科曹镔艾永康
Owner CENT SOUTH UNIV
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