Method for improving mechanical property of 3D printing nickel-based superalloy through in-situ heat treatment

A nickel-based superalloy, 3D printing technology, applied in the direction of improving energy efficiency, process efficiency, additive processing, etc., can solve problems such as cracking and poor mechanical properties, shorten the process flow, improve shaping, and avoid cracking Effect

Active Publication Date: 2020-12-01
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a method for in-situ heat treatment to improve the mechanical properties of 3D printed nickel-based superalloys. Aiming at the problems of laser 3D printing nickel-based superalloys such as cracking and poor mechanical properties, it is proposed for the first time that in the process of laser 3D printing of nickel-based superalloys, through Laser secondary scanning realizes in-situ heat treatment, eliminates residual stress, and avoids cracks; precipitates nano-precipitated phases, regulates the microstructure of alloys, and improves mechanical properties

Method used

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  • Method for improving mechanical property of 3D printing nickel-based superalloy through in-situ heat treatment
  • Method for improving mechanical property of 3D printing nickel-based superalloy through in-situ heat treatment
  • Method for improving mechanical property of 3D printing nickel-based superalloy through in-situ heat treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The matrix material is René104 nickel-based superalloy spherical powder with a particle size of 15-53 μm. The composition of René104 nickel-based superalloy is: 20.6Co-13Cr-3.4Al-3.9Ti-3.8Mo-2.1W-2.4Ta-0.9Nb -0.05Zr-0.03B-0.04C-the balance is Ni.

[0042] Include the following steps:

[0043] (1) Preparation before laser 3D printing

[0044] Establish a three-dimensional CAD model on the computer according to the shape of the part; use software to slice and layer the model, and import it into the additive manufacturing system; first, dry the alloy powder in a vacuum drying oven at 120°C for 4 hours, then put it into the powder supply tank and carry out Spread powder, and pass inert gas into the working chamber until the oxygen content is lower than 100ppm.

[0045] (2) Laser 3D printing manufacturing

[0046] Through the numerical control system, the high-energy laser beam is used to scan the alloy powder in step (1) twice, and the laser beam of A1 power is scanned r...

Embodiment 2

[0055] The difference from Embodiment 1 is the scanning parameters of the laser 3D printing process twice in the step (2). The first laser scanning process parameters in step (2) are as follows: laser spot diameter is 70 μm, laser power is 200 W, laser scanning rate is 850 mm / s, laser scanning distance is 90 μm, and the powder layer thickness is 30 μm; the second laser scanning process parameters are as follows : The laser spot diameter is 90μm, the laser power is 30W, the laser scanning speed is 250mm / s, and the laser scanning spacing is 60μm.

[0056] Others are the same as in Embodiment 1.

[0057] The prepared René 104 nickel-based superalloy has a compact structure and no cracks. After testing, the microhardness of the René 104 nickel-base superalloy prepared in Example 2 is 516HV 0.2 , Yield strength and tensile strength were 1017MPa and 1242MPa, elongation reached 11.1%.

Embodiment 3

[0059] The difference from Embodiment 1 is the scanning parameters of the laser 3D printing process twice in the step (2). The first laser scanning process parameters in step (2) are as follows: laser spot diameter is 70 μm, laser power is 225 W, laser scanning rate is 900 mm / s, laser scanning distance is 90 μm, and the powder layer thickness is 40 μm; the second laser scanning process parameters are as follows : Laser spot diameter is 100μm, laser power is 20W, laser scanning speed is 200mm / s, laser scanning spacing is 60μm.

[0060] Others are the same as in Embodiment 1.

[0061] The prepared René 104 nickel-based superalloy has a compact structure and no cracks. After testing, the microhardness of the René 104 nickel-based superalloy prepared in Example 3 is 531HV 0.2 , Yield strength and tensile strength were 1025MPa and 1258MPa, elongation reached 10.3%.

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Abstract

The invention provides a method for improving the mechanical property of a 3D printing nickel-based superalloy through in-situ heat treatment. The laser 3D printing process comprises the steps of firstly, forming alloy powder by using a high-energy-density laser beam to obtain a forming layer; and then, conducting in-situ secondary laser scanning on the forming layer through a low-energy-density laser beam to achieve in-situ heat treatment. Aiming at the problems of nickel-based superalloy laser 3D printing cracking, insufficient mechanical properties and the like, the high-power laser beam isadopted for primary scanning at a high scanning speed, and the forming layer is obtained through fusion forming; then, secondary scanning is conducted on the forming layer through the low-power laserat a low scanning speed, and the lasers are accurately controlled to scan the energy input twice, so that in-situ heat treatment in the nickel-based superalloy laser 3D printing process is achieved,residual stress is rapidly eliminated, and cracks are avoided; and a nano precipitated phase is separated out, the microstructure of the alloy is regulated, and the mechanical property is improved.

Description

technical field [0001] The invention provides a method for improving the mechanical properties of 3D printing nickel-based superalloys through in-situ heat treatment, and belongs to the field of superalloys and additive manufacturing. Background technique [0002] 3D printing technology has become one of the most concerned emerging technologies in the world. It has unique advantages in preparing parts with complex shapes. At the same time, it can improve the production efficiency of parts and reduce material waste, greatly reduce costs and shorten manufacturing time. In aerospace, It has broad application prospects in transportation, biomedicine and other fields. However, during the laser 3D printing process, the cooling rate is as high as 10 4 ~10 8 K / s, resulting in a large temperature gradient and high residual stress during the forming process, making the workpiece easy to crack; especially the "non-weldable" nickel-based superalloy with high crack sensitivity, cracks ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/24C22C30/00B33Y10/00B33Y50/02
CPCB22F3/24C22C19/056C22C30/00B33Y10/00B33Y50/02B22F2003/248Y02P10/25
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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