Method for inhibiting Laves phase precipitation in nickel-based alloy laser additive manufacturing process

A nickel-based alloy and laser additive technology, which is applied in the direction of additive manufacturing, additive processing, and improvement of process efficiency, can solve problems such as high maintenance costs, low cost performance, and cumbersome on-site repairs, and achieve reduction in size and volume fraction , increase the front temperature gradient, and promote the effect of solid solution

Pending Publication Date: 2021-11-02
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the current problem that only the adjustment of laser power and scanning speed is very limited for Laves phase suppression, and the additional control device is relatively complicated, and it is cumbersome for on-site repair, the maintenance cost is high, and the cost performance is

Method used

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  • Method for inhibiting Laves phase precipitation in nickel-based alloy laser additive manufacturing process
  • Method for inhibiting Laves phase precipitation in nickel-based alloy laser additive manufacturing process
  • Method for inhibiting Laves phase precipitation in nickel-based alloy laser additive manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1:

[0032] 1) selection of Inconel 718 superalloy as the substrate 2, the surface with sandpaper, and then remove its oil alcohol solution. The prepared powder was placed in an oven-specific removal of water for half an hour, after drying was placed in a boiling-type powder feeder, by way of coaxial powder.

[0033] 2) Use test 2000W semiconductor laser cladding, the spot diameter of the laser beam of the semiconductor laser emitted from the laser processing head 3 to 4mm; selected process as follows: 900W laser power, the scanning speed of 360mm / s, powder feed rate 10g / min. Protective gas and the carrier gas flow rate of 15L / min.

[0034] 3) by the cooling medium is liquid nitrogen cooling device 2 substrate 1, base substrate is cooled to reduce the heat accumulation in the forming process.

[0035] 4) determining a forming position, the position and orientation of the device of three copper tubes chilled adjust sync suppression, an air-cooled open the valve...

Example Embodiment

[0037] Example 2:

[0038] 1) selection of Inconel 625 as the substrate 2, the surface with sandpaper, and then remove its oil alcohol solution.

[0039] 2) The prepared powder was placed in an oven-specific removal of water for half an hour, after drying is placed in a blade-type powder feeder, by way of coaxial powder.

[0040] 3) using a semiconductor laser cladding 2000W, the spot diameter of the laser beam of the semiconductor laser emitted from the laser processing head 3 to 4mm; selected process as follows: 1600W laser power, the scanning speed of 420mm / s, powder feed rate 10g / min.

[0041] 4) determining a forming position, the position and orientation of the device of three copper tubes chilled adjust sync suppression, an air-cooled open the valve; regulating the flow of 3L / min, until the end of Additive process.

[0042] 5) After molding, the sample is cut line, mosaic, coarse grinding, fine grinding, polishing after etching Watch case where a series of processes. ...

Example Embodiment

[0043] Example 3:

[0044] 1) selection of Inconel 939 as the substrate 2, the surface with sandpaper, and then remove its oil alcohol solution.

[0045] 2) The prepared powder was placed in special dryers remove water for half an hour, after drying is placed in a blade-type powder feeder, by way of coaxial powder.

[0046] 3) using a semiconductor laser cladding 2000W, the spot diameter of the laser beam of the semiconductor laser emitted from the laser processing head 3 to 4mm; selected process as follows: 1800W laser power, the scanning speed of 420mm / s, powder feed rate 15g / min.

[0047] 4) determining a forming position, the position and orientation of the device of three copper tubes chilled adjust sync suppression, an air-cooled open the valve; regulating the flow of 20L / min, until the end of Additive process.

[0048] 5) After molding, the sample is cut line, mosaic, coarse grinding, fine grinding, polishing after etching Watch case where a series of processes.

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Abstract

The invention discloses a method for inhibiting Laves phase precipitation in a nickel-based alloy laser additive manufacturing process. The method specifically comprises the following steps that a base material is placed on a workbench with a cooling device, a synchronous inhibiting device is well installed, a semiconductor laser and a boiling type powder feeder are started to start cladding of metal powder, meanwhile, three chilling copper pipes of the synchronous inhibiting device are used for chilling the edge of a molten pool, after machining is completed, a sample is scanned, and the cross section structure condition of the sample is observed. According to the method, in the laser additive manufacturing or remanufacturing process of the nickel-based superalloy, a chilling source is added around the liquid molten pool, redistribution of a temperature field in the molten pool can be achieved, the front edge temperature gradient of a solid-liquid interface is increased, the solidification speed of the molten pool is increased, gathering of segregation elements such as Nb, Al and Ti among dendritic crystals is effectively reduced, and a guarantee is provided for precipitation of a strengthening phase in the subsequent aging treatment process.

Description

technical field [0001] The invention relates to the field of laser additive manufacturing, and more specifically relates to a method for inhibiting the precipitation of Laves phase during the process of laser additive manufacturing of nickel-based alloys. Background technique [0002] Laser additive manufacturing technology has the characteristics of rapid cooling and rapid solidification, but it is prone to severe segregation of elements such as Nb at the solid-liquid interface, thereby forming a long-chain Laves phase. In addition, during the laser additive manufacturing process, the precipitation of strengthening phases such as γ′-(Ni3Nb) and γ″-Ni3(Al,Ti) is often suppressed, which further affects its mechanical properties. Generally, in order to eliminate Laves phase and to maximize the microstructure and mechanical properties of the deposited nickel-based superalloy, generally requires homogenization or solution treatment. However, for remanufactured parts, if the over...

Claims

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Application Information

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IPC IPC(8): B22F10/28B22F12/20B33Y10/00B33Y40/00
CPCB22F10/28B22F12/20B33Y10/00B33Y40/00Y02P10/25
Inventor 姚建华张群莉张杰陈智君姚喆赫
Owner ZHEJIANG UNIV OF TECH
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