Alloy composite layer with components changing in gradient mode and preparation method of alloy composite layer

A composition gradient, composite layer technology, applied in the direction of additive manufacturing, additive processing, etc., can solve the problems of easy cracking of materials, consumption of large inert gas atomization liquid flow, and hindering the practical application of components.

Pending Publication Date: 2022-07-22
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the above method is used, the blank obtained by mixing two metal materials with large differences in thermal expansion coefficient has obvious interface area, loose structure and inherent pores, and the material is easy to crack or even be damaged.
Moreover, this process needs to consume a large amount of inert gas atomized liquid flow during the preparation process, forming inherent defect pores
For some components that do not require subsequent thermomechanical deformation, this defect is unavoidable, which seriously hinders the practical application of the component

Method used

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  • Alloy composite layer with components changing in gradient mode and preparation method of alloy composite layer
  • Alloy composite layer with components changing in gradient mode and preparation method of alloy composite layer
  • Alloy composite layer with components changing in gradient mode and preparation method of alloy composite layer

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preparation example Construction

[0031] The embodiment of the present application provides a preparation method of an alloy composite layer with a composition gradient, and the process flow chart is as follows: figure 1 The specific steps are as follows:

[0032] S1, spray the first alloy liquid to form the first alloy liquid layer, the temperature of the first alloy liquid is 30-150°C higher than its melting point; wait for the first alloy liquid layer to solidify from bottom to top to 2 / 3 of the thickness of the first alloy liquid layer ~3 / 4, spray the second alloy liquid to the surface of the first alloy liquid layer and form the second alloy liquid layer, the temperature of the second alloy liquid is 30 ~ 150 ℃ higher than its melting point, the first alloy liquid and the second alloy liquid Different types of liquid.

[0033] If the temperature of the alloy liquid is too high, the degree of superheat will be very large, which is not conducive to the formation of uniform and fine microstructures, and it ...

Embodiment 1

[0051] This embodiment provides an alloy composite layer with a composition gradient, which is obtained by the following preparation steps in a 3D printer:

[0052] S1. In the first crucible 110, the M2 high-speed steel liquid is placed as the first alloy liquid, and the M2 high-speed steel liquid is sprayed to form the M2 high-speed steel liquid layer, so as to ensure that the temperature of the M2 high-speed steel liquid is 50°C higher than the melting point of the M2 high-speed steel, and the spray flow rate It is 10kg / min; in the second crucible 120, the M3 high-speed steel liquid is filled as the second alloy liquid, and when the M2 high-speed steel liquid layer solidifies to 2 / 3 of the thickness of the M2 high-speed steel liquid layer from bottom to top, the M2 high-speed steel liquid is added to the M2 high-speed steel liquid. The surface of the liquid layer is sprayed with M3 high-speed steel liquid to form an M3 high-speed steel liquid layer. The temperature of the M3 ...

Embodiment 2

[0057] This embodiment provides a gradient composite layer alloy material with continuously changing composition, which is obtained by the following preparation steps in a 3D printer. Compared with the preparation steps of Embodiment 1, the main differences in this embodiment are as follows:

[0058] The 5V high-speed steel liquid is selected as the second alloy liquid to ensure that the temperature of the 5V high-speed steel liquid is 100°C higher than its melting point.

[0059] Among them, the composition of 5V high-speed steel includes: C: 2.0%, Si: 0.5%, Mn: 0.4%, Cr: 5.2%, Mo: 4.0%, V: 5.5%, W: 2.5%, Co: 0.3%, the remainder The amount is Fe; its melting point is 1320 °C.

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Abstract

The embodiment of the invention provides an alloy composite layer with components changing in a gradient mode and a preparation method thereof, and relates to the field of alloy materials. The preparation method of the component continuous change gradient composite layer of the alloy material comprises the following steps that alloy liquid is sprayed to form a first alloy liquid layer, and when the first alloy liquid layer is solidified to 2 / 3-3 / 4 of the thickness of the first alloy liquid layer from bottom to top, another alloy liquid is sprayed to the upper surface of the first alloy liquid layer to form a second alloy liquid layer. The alloy composite layer with gradient change of components prepared by using the preparation method disclosed by the embodiment of the invention is tight in combination, has fewer pores, and is not easy to generate cracking or damage caused by thermal mismatch.

Description

technical field [0001] The present application relates to the field of alloy materials, in particular, to an alloy composite layer with a composition gradient and a preparation method thereof. Background technique [0002] Spray forming technology can mix different alloys or metals to prepare high alloy or ultra-high alloy billets that are difficult to prepare by conventional processes. It has the characteristics of rapid solidification, which can promote the refinement of metal structure, make the billet structure uniform, and can greatly improve the alloy properties. . [0003] At present, the gradient material of spray forming is a simple superposition between single alloy materials, and the bonding between layers is weak; for example, the invention patent CN102151828A, firstly spray AlSi on the substrate 25 Semi-solid droplets, etc. AlSi 25 After deposition, spray AlSi 12 Semi-solid droplets, AlSi 12 Deposited on fully cured AlSi 25 Then, the matrix reciprocates to ...

Claims

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Application Information

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IPC IPC(8): B22F10/22B22F10/64B33Y10/00B33Y40/20C22C38/02C22C38/04C22C38/22C22C38/24C22C38/30C22C38/36
CPCB22F10/22B22F10/64C22C38/02C22C38/04C22C38/36C22C38/22C22C38/24C22C38/30B33Y10/00B33Y40/20B22F2999/00B22F2207/01
Inventor 王玉杰毛博张佼东青孙宝德姜海涛孙志龙
Owner SHANGHAI JIAO TONG UNIV
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