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Method for lowering residual stress of titanium-based composite material prepared due to selective laser melting

A titanium-based composite material, selective laser melting technology, applied in the directions of additive manufacturing, metal processing equipment, process efficiency improvement, etc., can solve the problems of reducing residual stress, excessive residual stress and easy cracking, etc., to reduce residual stress, improve Accuracy and yield, uniform distribution effect

Inactive Publication Date: 2019-10-29
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of excessive residual stress and easy cracking in the preparation of titanium-based composite materials in the prior art, and provide a method for reducing residual stress by magnetic field in the process of preparing titanium-based composite materials by selective laser melting

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  • Method for lowering residual stress of titanium-based composite material prepared due to selective laser melting

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Embodiment 1

[0042] A method for reducing the residual stress of titanium-based composite materials prepared by selective laser melting, the specific steps are as follows:

[0043] (1) The titanium-based composite material powder is prepared by mixing the matrix and additives by ball milling. The matrix is ​​pure titanium, and the additive is B 4 A mixture of C and carbon with a molar ratio of 1:3, the additive powder in the titanium-based composite powder accounts for 10% of the total volume of the titanium-based composite powder, the equivalent particle size of the matrix powder is 25-50 μm, and the equivalent particle size of the additive powder The diameter is 15~30μm;

[0044] (2) Preparation of titanium matrix composite components:

[0045] (2.1) Add a magnetic field to the selective laser melting equipment, the magnetic field is a static magnetic field, and it is a transverse magnetic field with a strength of 5T, and the stable area of ​​the magnetic field is located in the center ...

Embodiment 2

[0052] A method for reducing the residual stress of titanium-based composite materials prepared by selective laser melting, the specific steps are as follows:

[0053] (1) Titanium-based composite material powder is prepared by mixing the matrix and additives through ball milling. The matrix is ​​TC4, and the additive is a mixture of boron and lanthanum oxide with a molar ratio of 4:1. The additive powder in the titanium-based composite material powder accounts for 6% of the total volume of the titanium-based composite material powder, the equivalent particle size of the matrix powder is 80-100 μm, and the equivalent particle size of the additive powder is 60-80 μm;

[0054] (2) Preparation of titanium matrix composite components:

[0055] (2.1) Add a magnetic field to the selective laser melting equipment, the magnetic field is a static magnetic field, and it is a transverse magnetic field with a strength of 8T, and the stable area of ​​the magnetic field is located in the ce...

Embodiment 3

[0062] A method for reducing the residual stress of titanium-based composite materials prepared by selective laser melting, the specific steps are as follows:

[0063] (1) Titanium-based composite material powder is prepared by mixing the matrix and additives by ball milling. The matrix is ​​IMI834, and the additive is a mixture of boron and carbon with a molar ratio of 4:1. The additive powder in the titanium-based composite material powder accounts for the proportion of titanium 6% of the total volume of the matrix composite material powder, the equivalent particle size of the matrix powder is 40-70 μm, and the equivalent particle size of the additive powder is 30-60 μm;

[0064] (2) Preparation of titanium matrix composite components:

[0065] (2.1) Add a magnetic field to the selective laser melting equipment, the magnetic field is a static magnetic field, it is a longitudinal magnetic field, its strength is 3T, and the stable area of ​​the magnetic field is located in the...

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Abstract

The invention discloses a method for lowering the residual stress of a titanium-based composite material prepared due to selective laser melting. The method includes the steps that titanium-based composite material powder is prepared, and comprises base body powder and additive powder; the base body powder comprises a titanium element; the additive powder comprises one or more of a boron element,a carbon element and a rare earth element; the titanium-based composite material powder is placed into a selective laser melting device in a magnetic field to be subjected to selective laser melting till a titanium-based composite material component is made; and the residual stress in the made titanium-based composite material component is lowered by 20-80% than a component made without being subjected to the selective laser melting of the selective laser melting device in the magnetic field. According to the method, due to cooperation of the magnetic field and additives in the composite material, distribution of reinforcement bodies is more uniform, the microscopic structure of the titanium-based composite material is changed, the residual stress of the titanium-based composite material is remarkably lowered, and the precision and the yield of products are improved; and operation is easy, cost is low, efficiency is high, adaptability is high, and great application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of laser melting enhanced material manufacturing, and relates to a method for reducing the residual stress of titanium-based composite materials prepared by selective laser melting, in particular to a method for reducing residual stress through a magnetic field during the preparation of titanium-based composite materials by selective laser melting . Background technique [0002] Selective laser melting technology (Selective laser melting, referred to as SLM) is a technology that uses metal powder to be completely melted under the heat of a laser beam, cooled and solidified to form a shape. Under the action of high laser energy density, the metal powder is completely melted, and after heat dissipation and cooling, it can be metallurgically welded with solid metal. It is completely melted, no binder is needed, and the molding precision and mechanical properties are good. [0003] Titanium alloy components ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/105C22C14/00
CPCC22C14/00B22F3/1039B22F10/00B22F1/142B22F10/28B22F10/36B22F10/366Y02P10/25
Inventor 李九霄万召梅杨冬野侯书洛李鸣佩
Owner SHANGHAI UNIV OF ENG SCI
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