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Method for controlling directional growth of alloy grains in laser additive manufacturing process

A laser additive and manufacturing process technology, applied in the field of materials, can solve the problems of low temperature creep performance of alloys, difficult grain orientation, etc., and achieve the effects of reducing miscellaneous crystals, low cost, and prolonging service life

Pending Publication Date: 2022-05-17
BEIHANG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of laser additive manufacturing of alloys, due to the influence of additive manufacturing process parameters and grain epitaxial growth, if polycrystalline alloys are used as substrates, it is difficult to prepare microstructures with better grain orientation, resulting in high-temperature creep of the alloy. Decreased performance

Method used

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  • Method for controlling directional growth of alloy grains in laser additive manufacturing process
  • Method for controlling directional growth of alloy grains in laser additive manufacturing process
  • Method for controlling directional growth of alloy grains in laser additive manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1: First establish the 3D solid model that needs to be prepared, layer it, plan the deposition path of each layer, and import the file into the equipment control system.

[0042] Step 2: After that, pre-treat the selected substrate, remove the surface oxide layer, clean and dry it for later use.

[0043] Step 3: Fix the processed substrate on the workbench and perform laser surface remelting, such as figure 2 shown. The laser scanning path in this step depends on the shape of the first layer of material to be deposited on it.

[0044]Step 4: Use laser additive manufacturing technology to print the first layer. The schematic diagram of the laser scanning path is as follows image 3 (The shape in the figure is only for illustration and does not represent the actual material properties). This step is repeated until all layers are printed, and the prepared component can be obtained.

[0045] result:

[0046] The microstructure of the sample directly manufactured ...

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Abstract

The invention relates to a method for controlling directional growth of alloy grains in a laser additive manufacturing process. A method for controlling directional growth of alloy grains in the laser additive manufacturing process comprises the steps that a base material is selected, laser remelting treatment is conducted on the surface of the base material, and then laser additive manufacturing is conducted on the remelted surface. By means of the method, crystal grains can grow in an oriented mode, the mixed crystal generation probability is reduced, the bad influence of a transverse crystal boundary on high-temperature alloy is reduced, a prepared component structure can grow in an epitaxial mode according to the original crystal grain orientation of a remelting layer, and the better mechanical property is achieved in the low-temperature single-stress and high-temperature environment.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for controlling the directional growth of alloy crystal grains in the process of laser additive manufacturing. Background technique [0002] With the development of the aviation industry, the thrust-to-weight ratio of aero-engines is getting higher and higher, and the service environment is becoming more and more harsh, which puts forward higher requirements for the performance of its materials. Laser additive manufacturing technology has high forming precision, short preparation cycle and high material utilization rate. It has the characteristics of ultra-high temperature gradient and rapid solidification and cooling in the deposition process. The prepared components have fine structure and reduced element segregation. Therefore, laser additive manufacturing preparation High-performance metal components have become a current research hotspot. [0003] At present, und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F10/366B22F12/17B33Y10/00B33Y40/10C22C19/05
CPCB22F10/28B22F12/17B22F10/366C22C19/057B33Y10/00B33Y40/10Y02P10/25
Inventor 程序张馨月王佳玮王玉岱李卓朱言言冉先喆
Owner BEIHANG UNIV
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