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Method for in-situ reducing residual stress of titanium-based composite material prepared through selective laser melting

A titanium-based composite material, selective laser melting technology, applied in the direction of additive manufacturing, additive processing, process efficiency improvement, etc., can solve problems such as excessive residual stress and easy cracking, and achieve the effect of reducing residual stress

Inactive Publication Date: 2019-11-05
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 in-situ reduction of residual stress in the preparation of titanium-based composite materials by selective laser melting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for reducing the residual stress of titanium-based composite materials prepared by selective laser melting in situ, the specific steps are as follows:

[0038] (1) The matrix alloy for the preparation of the titanium-based composite material is pure titanium, and the reinforcement is TiB with a volume ratio of 0.2% fiber hybrid reinforced composite material. By uniformly mixing pure titanium with the powder of the chemical elements that form the reinforcement, the in-situ reaction formula is: Ti+TiB 2 =2TiB, prepared by vacuum smelting into the required titanium-based composite material billet, and then using the atomization method to produce powder, the reinforcement in the titanium-based composite material powder accounts for 0.2% of the total volume of the titanium-based composite material powder;

[0039] (2) Preparation of titanium matrix composite components:

[0040] (2.1) Lay a layer of titanium-based composite material powder and perform selective las...

Embodiment 2

[0046] A method for reducing the residual stress of titanium-based composite materials prepared by selective laser melting in situ, the specific steps are as follows:

[0047] (1) TC4 is selected as the matrix alloy for the preparation of titanium-based composite materials, and the reinforcement is TiC with a volume ratio of 2.5% and TiB with a volume ratio of 2.5%. By uniformly mixing the titanium alloy with the powder of the chemical elements that form the reinforcement, the in-situ reaction is Ti+C=TiC 5Ti+B 4 C=TiC+4TiB, the required titanium-based composite material blank is prepared by vacuum smelting, and then the powder is made by atomization method. The reinforcement in the titanium-based composite material powder accounts for 5% of the total volume of the titanium-based composite material powder;

[0048] (2) Preparation of titanium matrix composite components:

[0049] (2.1) Lay a layer of titanium-based composite material powder and perform selective laser melting...

Embodiment 3

[0055] A method for reducing the residual stress of titanium-based composite materials prepared by selective laser melting in situ, the specific steps are as follows:

[0056] (1) IMI834 is selected as the matrix alloy for the preparation of titanium-based composite materials, and the reinforcement is TiB with a volume ratio of Vol3.6%, La 2 o 3 Its volume ratio is Vol 1.1%. By uniformly mixing the titanium alloy with the powder of the chemical elements that form the reinforcement, the in-situ reaction is Ti+B=TiB, Ti+2ReX+3O=TiX+Re 2 o 3 , the required titanium-based composite material blank is prepared by vacuum smelting, and then the powder is made by atomization method. The reinforcement in the titanium-based composite material powder accounts for 4.7% of the total volume of the titanium-based composite material powder;

[0057] (2) Preparation of titanium matrix composite components:

[0058] (2.1) Spread a layer of titanium-based composite material powder, perform se...

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Abstract

The invention discloses a method for in-situ reducing the residual stress of a titanium-based composite material prepared through selective laser melting. The method includes the steps that titanium-based composite material powder is prepared, wherein the titanium-based composite material powder comprises a combination of titanium or a titanium alloy and chemical substances generating reinforcingbodies, and the chemical substances comprise one or more of a B (boron) element, a C (carbon) element and rare earth elements; one or more layers of the titanium-based composite material powder is laid on a base plate of a selective laser melting device, and selective laser melting is performed; and one or more times of laser remelting is performed on the surface solidified after the selective laser melting; and operation is repeated till a titanium-based composite material component is prepared. According to the method, after laser remelting is performed on the surface solidified after selective laser melting, the local heat effect caused by scanning a powder layer by using high-energy laser beams as a heat source is lowered, the reaction of the reinforcing bodies can be more thorough, precipitation of the reinforcing bodies is thinner and smaller, the residual stress in the component preparing process is lowered, and the performance of the material is changed.

Description

technical field [0001] The invention belongs to the technical field of laser melting enhanced material manufacturing, and relates to a method for in situ reducing the residual stress of titanium-based composite materials prepared by selective laser melting. Background technique [0002] Laser additive manufacturing of titanium alloy parts will be widely used in aircraft. However, since the selective laser melting process uses a high-energy laser beam as a heat source to scan the powder layer, this local heat input causes an uneven temperature field, causing local thermal effects, making the molten pool extremely prone to residual during solidification and cooling. stress. As a result, extremely high residual stresses are present in the interior of SELM-fabricated components. The existence of residual stress will not only affect the dimensional stability of the component, but also reduce the yield strength, fatigue strength and corrosion resistance of the component, and in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F1/00C22C49/11C22C49/14C22C14/00C22C32/00B33Y10/00B33Y70/00C22C101/22
CPCB22F1/0003C22C49/11C22C49/14C22C14/00C22C32/0047C22C32/0005C22C32/0052C22C32/0031C22C32/0073B33Y10/00B33Y70/00B22F10/00B22F10/38B22F12/17B22F10/364B22F10/28B22F10/36Y02P10/25
Inventor 李九霄侯书洛杨冬野万召梅李鸣佩
Owner SHANGHAI UNIV OF ENG SCI
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