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Method of regulating and controlling laser selective melting formed titanium alloy process based on flaw form

A laser selective melting and defect morphology technology, applied in the field of titanium alloy materials, can solve the problems of not establishing the relationship between defect types and forming processes, and lack of defect morphology evolution law.

Inactive Publication Date: 2021-03-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The research on internal defects and their influence on properties of titanium alloys formed by laser selective melting is still in its infancy, and the relationship between defect types and forming processes has not been established, and the evolution law of defect forms is lacking.

Method used

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  • Method of regulating and controlling laser selective melting formed titanium alloy process based on flaw form
  • Method of regulating and controlling laser selective melting formed titanium alloy process based on flaw form
  • Method of regulating and controlling laser selective melting formed titanium alloy process based on flaw form

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Embodiment 1

[0040] In this embodiment, the laser selective melting forming parameters: laser power 100W, laser scanning speed 900mm / s. Process parameter control process: such as figure 1 As shown, the microstructure analysis was carried out on the titanium alloy formed by the above process parameters, and the shape of internal defects. It can be seen from the figure that the defects inside the alloy under this process are irregular shape defects, indicating that the forming energy density is low. According to the present invention, parameters can be regulated by increasing the laser power or reducing the scanning speed.

[0041] Regulation strategy 1: Increase the laser power to 160W, such as figure 2 As shown in (a), the internal microstructure of the titanium alloy after forming. It can be seen from the figure that the number and size of the internal defects of the alloy are significantly reduced.

[0042] Control strategy two: reduce the scanning speed to 300mm / s, such as figure 2...

Embodiment 2

[0044] In this embodiment, the laser selective melting forming parameters: laser power 220W, laser scanning speed 600mm / s. Process parameter control process: such as image 3 As shown, the microstructure of the titanium alloy formed by the above process parameters was analyzed, and the shape of internal defects. It can be seen from the figure that the defects inside the alloy under this process are regular spherical defects, indicating that the forming energy density is too high. According to the present invention, parameters can be regulated by reducing the laser power or increasing the scanning speed.

[0045] Control strategy one: reduce the laser power, reduce the power to 160W, such as Figure 4 As shown in (a), the internal microstructure of the titanium alloy after forming, it can be seen from the figure that the number and size of the internal defects of the alloy are significantly reduced,

[0046] Control strategy two: increase the scanning speed and reduce the scann...

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Abstract

The invention relates to the technical field of titanium alloy materials, in particular to a method of regulating and controlling a laser selective melting formed titanium alloy process based on a flaw form. The method comprises the following steps of: first, detecting a microscopic structure of a laser selective melting formed titanium alloy; analyzing and determining a flaw type in the titaniumalloy; and optimizing forming process parameters according to the flaw type. The optimization is specifically as follows: if a flaw is in an irregular shape, it shows that the energy density is low, and adjustment can be carried out by improving the laser power or reducing the scanning speed; and if the flaw is in a regular shape, it shows that the energy density is too high, and adjustment can becarried out by reducing the laser power or improving the scanning speed. By adopting the method, quick responding adjustment on the forming process parameters can be carried out based on demands on surface quality, forming efficiency of a formed member and the like.

Description

Technical field: [0001] The invention relates to the technical field of titanium alloy materials, in particular to a method for regulating and controlling a laser selective melting and forming titanium alloy process based on defect morphology. Background technique: [0002] Compared with the traditional "equal material forming" hot processing technologies such as casting, forging, and welding, and the "subtractive forming" cold processing technologies such as turning, milling, and grinding, additive manufacturing is a new "additive forming" technology. Based on the forming concept of "discrete + accumulation", high-energy particle beams (laser or electron beam) are used to melt metal powder, and combined with three-dimensional solid digital models to prepare high-performance and complex structural metal parts layer by layer from bottom to top. It has broad application prospects in aerospace, weaponry, automobiles, molds, biomedicine and other fields. However, due to the com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F10/85B33Y50/02
CPCB33Y50/02
Inventor 吉海宾张宏伟蔡雨升雷家峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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