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Method for removing cracks of Rene104 nickel-based superalloy during laser additive manufacturing

A nickel-based superalloy and laser additive technology, which is applied in the direction of additive manufacturing, additive processing, and energy efficiency improvement, can solve the problems of reducing the mechanical properties of formed parts, large residual stress of formed parts, and easy cracking, etc., to achieve control The generation and superposition of residual stress, excellent mechanical properties, and the effect of eliminating internal cracks

Active Publication Date: 2018-12-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, laser additive manufacturing has a large thermal gradient and repeated remelting, resulting in large residual stress in the formed part, which is prone to cracking, especially nickel-based superalloys with high Al and Ti content and poor weldability, which are prone to cracks during the forming process , seriously reducing the mechanical properties of the formed parts

Method used

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  • Method for removing cracks of Rene104 nickel-based superalloy during laser additive manufacturing
  • Method for removing cracks of Rene104 nickel-based superalloy during laser additive manufacturing
  • Method for removing cracks of Rene104 nickel-based superalloy during laser additive manufacturing

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Experimental program
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Effect test

Embodiment 1

[0054] Use 3D design software and 3D composition software to construct a 3D cylinder model with a diameter of 40mm and a height of 15mm, convert it into an STL file and import it into the laser selection melting construction software, and import it into the SLM printing system after the software slices itself. After the substrate is heated to 150°C, the Renè 104 nickel-based superalloy powder is added to the powder supply cylinder and powder is spread, and argon gas is introduced into the working chamber until the oxygen content is lower than 100ppm. After entering the printing program, the steps of powder spreading and laser scanning powder are repeated until the printing is completed and a cylinder is obtained. Afterwards, the printed cylinder is sequentially subjected to stress relief annealing and spark plasma sintering.

[0055] Among them, the particle size of Renè104 nickel-based superalloy powder is 15-53 μm, D10 is 17.5 μm, D50 is 29.3 μm, and D90 is 46.9 μm.

[0056...

Embodiment 2

[0064] Use 3D design software and 3D composition software to construct a 3D cylinder model with a diameter of 40mm and a height of 15mm, convert it into an STL file and import it into the laser selection melting construction software, and import it into the SLM printing system after the software slices itself. After the substrate is heated to 150°C, the Renè 104 nickel-based superalloy powder is added to the powder supply cylinder for powder spreading, and argon gas is introduced into the working chamber until the oxygen content is lower than 0.1%. Then enter the printing program, and repeat the steps of powder spreading and laser scanning powder until the printing is completed and a cylinder is obtained.

[0065] Among them, the particle size of Renè104 nickel-based superalloy powder is 15-53 μm, D10 is 17.5 μm, D50 is 29.3 μm, and D90 is 46.9 μm.

[0066] The SLM process parameters are: laser power 225W, spot diameter 0.12mm, scanning speed 600mm / s, scanning distance 0.11mm,...

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Abstract

The invention provides a method for removing cracks of Rene104 nickel-based superalloy during laser additive manufacturing, and belongs to the fields of additive manufacturing and superalloy. Aiming at solving the problem that cracks are liable to occur to Rene104 nickel-based superalloy with a high Al content and a high Ti content (Al+Ti>5%) during laser additive manufacturing, by designing laserforming parameters and sub-regional scanning strategies, generation of large-size cracks in a formed part is suppressed; then stress relief annealing is used for completely removing residual stress in the formed part; and discharge plasma sintering treatment is adopted for removing the cracks in the formed part, and grain growth during the sintering process is suppressed. The scheme that after the formed part is obtained through laser additive manufacturing, in combination with stress relief annealing and discharge plasma sintering treatment, the cracks in the formed part are removed is proposed for the first time. By using the method for preparing the Rene104 nickel-based superalloy with the high Al content and high Ti content, no cracks are found in the formed part, and the tensile strength of the formed part at the room temperature can reach 1300 MPa or higher.

Description

technical field [0001] The invention provides a method for eliminating cracks in Renè104 nickel-based superalloy laser additive manufacturing, which belongs to the field of additive manufacturing and superalloys. Background technique [0002] Nickel-based superalloys maintain excellent yield resistance, fatigue resistance, creep resistance and corrosion resistance at high temperatures above 600°C, and are widely used in aerospace, energy power, transportation and nuclear power industries, especially aeroengines , rocket engines and gas turbines, etc., are key hot-end components. Because nickel-based superalloys contain a large amount of refractory alloy elements, powder forming is difficult, deformation processing is difficult, the manufacturing process is cumbersome, and the process is complicated, especially for parts with complex shapes, which seriously restrict the application of nickel-based superalloys. [0003] Laser additive manufacturing technology, also known as l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/24B33Y10/00B33Y50/02B22F1/052
CPCB22F3/24B33Y10/00B33Y50/02B22F2003/248B22F2003/1051B22F10/00B22F10/32B22F12/17B22F10/28B22F10/64B22F10/36B22F10/366B22F1/052B22F2999/00C22C1/0433Y02P10/25B22F10/38B33Y40/20B22F2998/10B22F2201/02B22F2201/11B22F2203/11B22F2203/13B22F2301/15B22F2304/10
Inventor 刘祖铭彭凯吕学谦赵凡李全魏冰
Owner CENT SOUTH UNIV
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