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A kind of nickel-based alloy weld microstructure and grain refinement method and its application

A technology of nickel-based alloy and grain refinement, which is applied in welding equipment, welding medium, welding equipment, etc., can solve the problems that the refiner cannot be evenly distributed and the crystal grains are coarse, so as to solve the problem of coarse weld structure and improve Strong toughness, effect of promoting nucleation

Inactive Publication Date: 2021-02-02
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method fully mixes the refiner powder with the alloy powder of the welding base metal and performs welding, which can effectively solve the problem that the existing refiner cannot be uniformly distributed in the weld structure, and at the same time overcome the problem of nickel-based alloys in the welding process. Coarse grain defects can improve the hardness, toughness and comprehensive mechanical properties of nickel-based alloys by refining the structure and reducing the grain size. This method can also be applied to the manufacture of flux cored wires, solid cored wires or Powder cladding and additive manufacturing powder preparation and other fields

Method used

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  • A kind of nickel-based alloy weld microstructure and grain refinement method and its application
  • A kind of nickel-based alloy weld microstructure and grain refinement method and its application
  • A kind of nickel-based alloy weld microstructure and grain refinement method and its application

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Embodiment 1

[0033] In the method for refining the structure of nickel-based alloy welds in this embodiment, the nickel-based alloy used is nickel 718 alloy, and its chemical composition mass percentage is: C: 0.05%, Mn: 0.1%, Fe: 20%, P: 0.01% , S: 0.001%, Si: 0.06%, Al: 0.45%, Ti: 1.0%, Cr: 17.4%, Nb: 5%, Mo: 3.0%, Ni: balance.

[0034] The raw materials of the nickel-based alloy are: high-carbon ferromanganese powder, high-carbon ferrochrome powder, ferromolybdenum powder, pure iron powder, high-purity metal niobium powder, high-purity metal aluminum powder, high-purity metal titanium powder, high-purity metal nickel powder and high-purity silica fume. These powders are all commercially available.

[0035]Prepare nickel 718 alloy powder according to the above-mentioned nickel-based alloy formula; Then add mass fraction in the above-mentioned nickel 718 alloy powder and be 0.2% (0.2% here is 0.2% of the quality of nickel 718 alloy powder raw material, the same below) diameter is 100nm ...

Embodiment 2-5

[0042] In the refinement method of embodiment 2-5, each step is the same as embodiment 1, and the welding process is also the same as embodiment 1, and the difference is that the content of adding nano-titanium dioxide refiner is different. After refinement in each embodiment, the nickel base alloy See Table 2 for the mass percent of each component.

[0043] And according to the micro-Vickers hardness tester with reference to the GBT4340.1-2009 national standard, the microhardness of the samples in each embodiment was measured.

[0044] Ingredient mass percent (wt %) in each embodiment of table 2

[0045]

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Abstract

The invention relates to a method for refining grains of a nickel-based alloy weld structure and its application. The steps of the method are: 1) preparing nickel-based alloy powder according to the formula of the nickel-based alloy; Add nano-refining agent in the base alloy powder, the addition amount of described refiner is 0.2~2% of the nickel-base alloy powder mass of step 1) preparation, put the nickel-base alloy powder that has added refiner into V In a type powder mixer, stir until the alloy powder is fully mixed and uniform, and then the nickel-based alloy powder with the addition of a refiner is obtained. This method can effectively solve the problem that the existing refiner cannot be evenly distributed in the weld structure, and at the same time overcome the defect of coarse grains in the welding process of nickel-based alloys. By refining the structure and reducing the grain size, it can improve The hardness, toughness and comprehensive mechanical properties of nickel-based alloys can be applied to the manufacture of flux-cored welding wires, solid-cored welding wires, or powder cladding and additive manufacturing powder preparation.

Description

technical field [0001] The invention relates to the technical field of nickel-based alloy welding, in particular to a method for refining grains of a nickel-based alloy weld structure and an application thereof. Background technique [0002] Nickel-based alloys have good medium and high temperature strength, ductility, corrosion resistance and fatigue resistance, as well as unique low-temperature performance, excellent machinability and welding performance, so they are widely used in aerospace, gas turbine engines, etc. High-temperature parts and industrial corrosion-resistant environments such as petrochemical industry. However, due to the poor thermal conductivity of nickel-based alloys, the weld structure is coarse during the welding process, resulting in a decrease in the strength and toughness of the weld structure, an increase in crack sensitivity, and a decrease in the mechanical properties of the material. Therefore, by controlling the solidification of the weld str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/362B23K35/40B23K9/167
CPCB23K9/167B23K35/304B23K35/3608B23K35/362B23K35/40
Inventor 陈翠欣左玉强刘宝玺薛海涛
Owner HEBEI UNIV OF TECH
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