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A method for preparing high-temperature titanium alloys using selective laser melting rapid prototyping technology

A high-temperature titanium alloy and laser melting technology, which is applied in the direction of improving energy efficiency and process efficiency, can solve problems such as component segregation and affect the performance of parts, and achieve the effects of alleviating residual stress, suppressing cracks, and shortening the manufacturing cycle.

Active Publication Date: 2017-08-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 3D printing technology uses laser selective melting and sintering powder, so it has special requirements on powder fluidity, oxygen content and particle size distribution. Therefore, although the above titanium alloy TA12 powder can be used for casting, it can be directly applied to 3D printing forming there are still problems
In addition, the physical properties of the elements in the alloy are quite different. Under the action of high-energy laser, the elements with low melting point are easy to cause composition segregation due to evaporation, which affects the performance of parts, etc.

Method used

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  • A method for preparing high-temperature titanium alloys using selective laser melting rapid prototyping technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) According to the nominal chemical composition of titanium alloy Ti-5.5Al-3.5Sn-3Zr-0.7Mo-0.3Si-0.4Nb-0.4Ta, the powder of each element is prepared and mixed, and the Ti element, Al element, The mass ratio of Sn element, Zr element, Mo element, Si element, Nb element and Ta element is: 1:5.5:3.7:3:0.7:0.3:0.4:0.2, and then the mixed powder is subjected to vacuum induction melting;

[0030] (2) Using argon gas atomization to carry out gas atomization powder production on the above-mentioned smelted alloy, the obtained powder is spherical or quasi-spherical, the material diameter is distributed in 15-30 μ m, the oxygen content is lower than 800 ppm, and the powder fluidity is good;

[0031] (3) Set up a three-dimensional CAD model of parts on a computer, convert the three-dimensional model of said parts into STL format and import it into the 3D printing forming equipment;

[0032] (4) The powder prepared by gas atomization is filled into the selective laser melting rap...

Embodiment 2

[0036](1) According to the nominal chemical composition of titanium alloy Ti-5.5Al-3.5Sn-3Zr-0.7Mo-0.3Si-0.4Nb-0.4Ta, the powder of each element is prepared and mixed, and the Ti element, Al element, The mass ratio of Sn element, Zr element, Mo element, Si element, Nb element and Ta element is: 1:5.5:3.7:3:0.7:0.3:0.3:0.3, and then the mixed powder is subjected to vacuum induction melting;

[0037] (2) Using argon gas atomization to carry out gas atomization powder production on the above-mentioned smelted alloy, the obtained powder is spherical or quasi-spherical, the material diameter is distributed in 30-45 μ m, the oxygen content is lower than 800 ppm, and the powder fluidity is good;

[0038] (3) Set up a three-dimensional CAD model of parts on a computer, convert the three-dimensional model of said parts into STL format and import it into the 3D printing forming equipment;

[0039] (4) The powder obtained by gas atomization is filled into the selective laser melting rapi...

Embodiment 3

[0043] (1) According to the nominal chemical composition of titanium alloy Ti-5.5Al-3.5Sn-3Zr-0.7Mo-0.3Si-0.4Nb-0.4Ta, the powder of each element is prepared and mixed, and the Ti element, Al element, The mass ratio of Sn element, Zr element, Mo element, Si element, Nb element and Ta element is: 1:5.5:3.7:3:0.7:0.3:0.2:0.4, and then the mixed powder is subjected to vacuum induction melting;

[0044] (2) Using argon gas atomization to carry out gas atomization powder production on the above-mentioned smelted alloy, the obtained powder is spherical or quasi-spherical, the material diameter is distributed in 20-40 μ m, the oxygen content is lower than 800 ppm, and the powder fluidity is good;

[0045] (3) Set up a three-dimensional CAD model of parts on a computer, convert the three-dimensional model of said parts into STL format and import it into the 3D printing forming equipment;

[0046] (4) The powder obtained by gas atomization is filled into the selective laser melting rap...

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Abstract

The invention discloses a method for preparing high temperature titanium alloy by adopting a selective laser melting rapid formation technique. The method comprises the following steps: (1), preparing powder of elements in nominal chemical components of titanium alloy according to the mass proportion of all the elements, then carrying out vacuum induction melting; (2), milling titanium alloy formed by melting by adopting a gas atomization milling method; (3), establishing a part three-dimensional model, and importing the part three-dimensional model into selective laser melting rapid formation equipment; (4), placing powder into the selective laser melting rapid formation equipment, and carrying out part forming on a substrate; (5), separating the formed part from the substrate by adopting a wire cutting process, annealing the part, so as to improve the plasticity and the toughness of titanium alloy; (6), performing a high temperature oxidation test on the part, so as to determine the high temperature oxidation resistance of the novel titanium alloy. According to the method for preparing high temperature titanium alloy by adopting the selective laser melting rapid formation technique, provided by the invention, a high temperature titanium alloy part with a complex structural shape is quickly formed, and the characteristics of rapid manufacturing, accurate manufacturing and reduction of manufacturing cost and the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of additive preparation, and more specifically relates to a method for preparing a high-temperature titanium alloy by using a selective laser melting rapid prototyping technology. Background technique [0002] Titanium alloys are widely used in aerospace, military chemical, medical and other fields due to their outstanding characteristics such as high specific strength, high toughness, good corrosion resistance, and non-magnetic properties. For example, in the field of aerospace, titanium alloy is another new type of lightweight structural material used in this field after steel and aluminum alloys. Its application level has become an important symbol to measure the advanced degree of aircraft material selection. As one of the important structural materials with good weight reduction effect for aircraft body and engine, the amount of titanium alloy used in the field of commercial and military aircraft has s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C14/00B22F3/105B22F9/08
CPCY02P10/25
Inventor 史玉升周燕滕庆魏青松周旭李伟赵晓
Owner HUAZHONG UNIV OF SCI & TECH
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