A simultaneous laser heat treatment method for laser additive manufacturing of nickel-based superalloys

A nickel-based superalloy, laser heat treatment technology, applied in the direction of additive manufacturing, additive processing, energy efficiency, etc., can solve the problem of the influence of the base material area of ​​the forging, to improve the mechanical properties, enhance the coordinated deformation ability of the material, and reduce the stress concentrated effect

Active Publication Date: 2022-01-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the short-term solution treatment of the whole part will still affect the forging base material area. For laser repair precision parts and final processed parts, it is required to carry out local heat treatment on the basis of not affecting the forging base material.

Method used

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  • A simultaneous laser heat treatment method for laser additive manufacturing of nickel-based superalloys
  • A simultaneous laser heat treatment method for laser additive manufacturing of nickel-based superalloys
  • A simultaneous laser heat treatment method for laser additive manufacturing of nickel-based superalloys

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Experimental program
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Effect test

preparation example Construction

[0038] The preparation process of the nickel-based superalloy specifically includes the following processes:

[0039](1) Put the GH4169 superalloy spherical powder with a particle size of -80 to +325 mesh into the powder feeder, or put the GH4169 wire into the wire feeder.

[0040] (2), put the substrate or the repaired part into the atmospheric environment or an argon-filled inert atmosphere processing room, and fix it on the workbench; when the substrate is selected, the substrate is made of carbon steel, stainless steel or a superalloy; when the substrate is a superalloy, it is preferably Forging GH4169 superalloy; when an argon-filled inert atmosphere is used, the inlet and outlet of the argon-filled inert atmosphere processing chamber are opened, and the additive manufacturing of GH4169 superalloy starts after the argon gas is replaced until the oxygen content is below 100ppm.

[0041] When argon is replaced, high-purity argon with a purity greater than or equal to 99.99%...

Embodiment 1

[0052] (1) Put the GH4169 superalloy spherical powder with a particle size of -80 to +325 mesh into the powder feeder;

[0053] (2) Fix the forged GH4169 superalloy substrate on the workbench in the atmospheric environment;

[0054] (3) The laser heat source fiber laser is introduced, and the laser additive manufacturing process parameters are: laser cladding power 700W, spot diameter 1mm, powder feeding rate 9g / min, lap rate 50%, scanning speed 8mm / s. The CNC system is used to synchronously open the powder feeder to transport GH4169 superalloy powder; prepare a GH4169 superalloy part with a height of 2.8mm and retain the Laves phase, and its microstructure is as follows figure 1 with figure 2 shown; figure 1 It shows that the as-deposited structure is dominated by columnar crystals that grow epitaxially along the deposition direction. from figure 2 It can be seen from the figure that there are a large number of Laves phases with continuous strips and irregular shapes in...

Embodiment 2

[0060] The process parameters of laser heat treatment are: laser power 200W, spot diameter 1mm, scan rate 20mm / s, laser beam is used to continuously scan the GH4169 superalloy parts with Laves phase for 3min, and the Laves phase volume fraction of the overall sample is 1.36%. Compared with the state, it is 60.58% lower. The microstructural characteristics of the obtained GH4169 superalloy after heat treatment are as follows: Figure 7 , Figure 8 , Figure 9 shown. Figure 7 The grain morphology of its macroscopic morphology has not changed significantly, and the columnar crystals that grow epitaxially along the deposition direction are still the main ones. Figure 8 The Laves phase size and volume fraction are shown to be further reduced. Figure 9 It shows that after laser heat treatment, the strengthening phase γ”+γ’ phase inside the forging base material is diffusely distributed in the matrix without dissolution.

[0061] All the other unrelated steps are the same as ...

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Abstract

The invention discloses a synchronous laser heat treatment method for laser additive manufacturing of nickel-based superalloy. The method can effectively control the morphology, size and distribution of the Laves phase, and the Laves phase is transformed from a continuous long strip in a deposition state to a discrete granular shape. And its volume fraction decreased significantly with the prolongation of laser heat treatment time. The laser heat treatment method of the invention can realize the simultaneous heat treatment in the deposition and forming process, realize the regulation of the morphology and distribution of the Laves phase in the local area without affecting the tissue properties of the laser repaired substrate area, and obtain fine and dispersed granular Laves phase, thereby improving the overall mechanical properties of the parts, and can be effectively used in the repair and remanufacturing of superalloy structural parts. In addition, the invention can also be used in the fields of high-temperature alloy material preparation, rapid manufacturing of high-temperature alloy structural parts, and the like.

Description

【Technical field】 [0001] The invention belongs to the field of metal material preparation and advanced manufacturing, and in particular relates to a synchronous laser heat treatment method for laser additive manufacturing of nickel-based superalloys. 【Background technique】 [0002] Nickel-based superalloys have excellent comprehensive mechanical properties and good corrosion resistance at high temperatures, and have been widely used in aviation, aerospace, energy, chemical and other fields. GH4169 superalloy, the US corresponding brand Inconel718, is the most widely used nickel-based superalloy, and is widely used in high-temperature parts such as aero-engine casings, blades and turbine disks due to its excellent high-temperature performance. There are a large number of continuous strip-like Laves phases in the deposited samples of GH4169 superalloy manufactured by laser additive manufacturing. It is generally considered as a brittle phase that seriously affects the mechanic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105C22F1/10B33Y10/00
CPCC22F1/10B33Y10/00B22F10/00B22F12/70B22F10/36B22F12/41B22F10/25B22F10/32Y02P10/25
Inventor 陈静李浩胜隋尚马良李祚赵轩
Owner NORTHWESTERN POLYTECHNICAL UNIV
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