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Method and device for controlling nickel-based high-temperature alloy brittle phase 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 problem that the precipitation of the brittle phase of LAVES between dendrites cannot be reduced, and achieve the promotion of effective precipitation and increase the temperature Gradient, the effect of improving mechanical properties

Inactive Publication Date: 2018-08-24
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a processing method and device for laser additive manufacturing of nickel-based superalloys, which solves the problem that the precipitation of LAVES brittle phases between dendrites cannot be reduced during the additive manufacturing process

Method used

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  • Method and device for controlling nickel-based high-temperature alloy brittle phase during laser additive manufacturing
  • Method and device for controlling nickel-based high-temperature alloy brittle phase during laser additive manufacturing
  • Method and device for controlling nickel-based high-temperature alloy brittle phase during laser additive manufacturing

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Embodiment 1

[0058] figure 2 It is the microstructure diagram of the nickel-based superalloy obtained by adopting the traditional coaxial powder feeding laser additive manufacturing method according to the embodiment of the present invention; image 3 The microstructural diagram of the nickel-based superalloy obtained by using the coaxial powder feeding laser additive manufacturing method of the present invention for the embodiment of the present invention; see figure 2 and image 3 .

[0059] S1. The process test obtained the process parameters with good formability of laser additive manufacturing of nickel-based superalloy. The parameters include: laser power 2000W, scan rate 480mm / min, powder feeding rate 5g / min, powder feeding gas flow rate 6L / min, laser spot The size is 2mm, the overlap rate between channels is 40%, and the height between layers is 0.3mm. The substrate used is 1Cr18Ni9Ti stainless steel, the powder used is GH4169 alloy powder prepared by plasma rotating electrode...

Embodiment 2

[0065] S1. The process test obtained good process parameters for laser additive repair of nickel-based superalloys. The parameters include: laser power 1400W, scanning rate 360mm / min, powder feeding rate 5g / min, powder feeding gas flow rate 6L / min, laser spot size 3mm , The overlap rate between the roads is 25%, and the height between layers is 0.3mm. The repair sample material is GH4169 nickel-based superalloy block with V-shaped groove defects. The powder used is GH4169 alloy powder prepared by plasma rotating electrode method, and the particle size is 100 mesh.

[0066] S2. During the whole process of laser additive repair of nickel-based superalloy, an auxiliary electromagnetic field is applied to the liquid metal in the molten pool. The parameters are: magnetic field strength 80mT, magnetic field frequency 50HZ, until the forming is completed. During laser additive repair, the electromagnetic generating device is placed on the workbench, and the formed sample or part is p...

Embodiment 3

[0068] S1. The process test obtained the process parameters with good formability of laser additive manufacturing of nickel-based superalloy. The parameters include: laser power 2500W, scan rate 400mm / min, powder feeding rate 10g / min, powder feeding gas flow rate 8L / min, laser spot The size is 2.5mm, the overlapping rate between channels is 50%, and the height between layers is 0.2mm. The substrate used is 1Cr18Ni9Ti stainless steel, the powder used is GH4169 alloy powder prepared by plasma rotating electrode method, and the particle size is 100 mesh.

[0069] S2. During the whole process of laser additive manufacturing of nickel-based superalloys, an auxiliary electromagnetic field is applied to the liquid metal in the molten pool. The parameters are: magnetic field strength 80mT, magnetic field frequency 100HZ, until the forming is completed. During forming, the electromagnetic generating device and the powder feeding head follow up.

[0070] Each embodiment in this specifi...

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Abstract

The invention discloses a method and device for controlling nickel-based high-temperature alloy brittle phase during laser additive manufacturing. The method comprises the steps that a nickel-based high-temperature alloy sample is clamped onto a numerically-controlled workbench, the machining position of the sample is determined, laser is applied to the machining position to form a molten metal bath, an electromagnetic field is applied to the molten metal bath, powdered metal is fed to the molten metal bath, undergoes melting under action of the laser and undergoes solidification under actionof the electromagnetic field to form a shaped sample, and machining of the nickel-based high-temperature alloy is completed. By adoption of the method or the device, the problem that in the traditional nickel-based high-temperature alloy additive manufacturing process, precipitation of interdendritic LAVES brittle phases cannot be reduced is solved.

Description

technical field [0001] The invention relates to the field of laser additive manufacturing of metal materials, in particular to a processing method and device for controlling the brittle phase of nickel-based superalloy LAVES manufactured by laser additive manufacturing. Background technique [0002] Laser additive manufacturing technology is an advanced material preparation technology based on the concept of "additive" manufacturing. This technology fully utilizes the advantages of unbalanced solidification of molten metal in laser cladding technology and rapid prototyping technology to form three-dimensional solid parts point by point. Advantages, it can realize rapid high-performance forming and repairing of metal parts with complex structures. Since the solidification process of molten pool metal has the characteristics of near-rapid solidification, laser additive manufacturing metal materials mostly have the characteristics of fine structure and high supersaturation of a...

Claims

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Application Information

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IPC IPC(8): B22F3/105B33Y10/00B33Y30/00
CPCB33Y10/00B33Y30/00B22F2999/00B22F10/00B22F10/36B22F10/38B22F12/41B22F10/25B22F10/50B22F10/322B22F2202/05Y02P10/25
Inventor 刘奋成任航刘秀霞程洪茂黄春平
Owner NANCHANG HANGKONG UNIVERSITY
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