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 not high. , proposed a method for inhibiting the precipitation of Laves phase in the process of laser additive manufacturing of nickel-based alloys. This method is simple and practical, and can inhibit the precipitation of Laves phase to a certain extent, and at the same time alleviate the collapse caused by the tailing of the molten pool

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

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Experimental program
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Effect test

Embodiment 1

[0032] 1) Inconel 718 superalloy is selected as the substrate 2, the surface is polished with sandpaper, and the oil stain is removed with alcohol solution. Put the prepared special powder into the oven for half an hour to remove moisture, and place it in the boiling powder feeder after drying, using the coaxial powder feeding method.

[0033] 2) A 2000W semiconductor laser was used for cladding experiments. The spot diameter of the laser beam emitted by the laser processing head 3 of the semiconductor laser was 4mm; the selected process was: laser power 900W, scanning speed 360mm / s, and powder feeding volume 10g / min. The flow rate of protective gas and carrier gas is 15L / min.

[0034] 3) The substrate 2 cooling device 1 whose cooling medium is liquid nitrogen cools the bottom of the substrate to reduce heat accumulation during the forming process.

[0035] 4) Determine the forming position, adjust the position and direction of the three chilled copper tubes in the synchronou...

Embodiment 2

[0038] 1) Select Inconel 625 as the substrate 2, polish the surface with sandpaper, and then use alcohol solution to remove its oil stains.

[0039] 2) Put the prepared special powder in an oven for half an hour to remove moisture, and place it in a scraper-type powder feeder after drying, using coaxial powder feeding.

[0040] 3) A 2000W semiconductor laser is used for cladding, and the spot diameter of the laser beam emitted by the laser processing head 3 of the semiconductor laser is 4mm; the selected process is: laser power 1600W, scanning speed 420mm / s, powder feeding amount 10g / min.

[0041] 4) Determine the forming position, adjust the position and direction of the three chilled copper tubes in the synchronous suppression device, open the air cooling valve; adjust the flow rate to 3L / min until the end of the additive process.

[0042] 5) After forming, observe the structure after a series of processes such as wire cutting, inlaying, rough grinding, fine grinding, polish...

Embodiment 3

[0044] 1) Select Inconel 939 as the substrate 2, polish the surface with sandpaper, and then use alcohol solution to remove its oil stains.

[0045] 2) Put the prepared special powder into the dryer for half an hour to remove moisture, and place it in the scraper type powder feeder after drying, adopting the method of coaxial powder feeding.

[0046] 3) A 2000W semiconductor laser is used for cladding, and the spot diameter of the laser beam emitted by the laser processing head 3 of the semiconductor laser is 4mm; the selected process is: laser power 1800W, scanning speed 420mm / s, powder feeding amount 15g / min.

[0047] 4) Determine the forming position, adjust the position and direction of the three chilled copper tubes in the synchronous suppression device, open the air cooling valve; adjust the flow rate to 20L / min until the end of the additive process.

[0048] 5) After forming, conduct a series of processes such as wire cutting, inlaying, rough grinding, fine grinding, po...

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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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