Quasi-TC4 titanium alloy for laser additive manufacturing application

A laser additive and titanium alloy technology, applied in additive manufacturing, additive processing, metal processing equipment, etc., can solve the problems of low plasticity, different solidification structure and original intragranular structure characteristics, high strength, etc., to achieve dense structure, The effect of excellent internal organization and excellent mechanical properties

Active Publication Date: 2020-07-28
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the unique rapid melting characteristics and complex thermal cycle history characteristics of laser additive manufacturing, the solidification structure and original intragranular structure characteristics of laser additive manufacturing TC4 titanium alloys are different from those of titanium alloys prepared by traditional processing techniques.
The solidification structure presents the characteristics of coarse columnar grain texture growing along the direction, and the slender α laths are formed in the original β grains, which makes the mechanical behavior characteristics of high strength and low plasticity in the laser additive manufacturing titanium alloy, which shows that The existing TC4 titanium alloy composition is not the most suitable alloy composition for laser additive manufacturing, and cannot maximize the advantages of this technology

Method used

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  • Quasi-TC4 titanium alloy for laser additive manufacturing application
  • Quasi-TC4 titanium alloy for laser additive manufacturing application
  • Quasi-TC4 titanium alloy for laser additive manufacturing application

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The class TC4 titanium alloy of the present embodiment is made up of the composition of following mass percent: Mo 1.05%, Al5.52%, V 3.53%, the balance is Ti and unavoidable impurity; The preparation process of this class TC4 titanium alloy comprises The following steps:

[0044] Step 1. Drying the element mixed powder of TC4-like titanium alloy at 100° C. for 4 hours; the average particle size of the element mixed powder is 100 μm to 150 μm, the mass purity is 99.8%, and the mass content of oxygen is 0.12%;

[0045] Step 2. Using the dried TC4-like titanium alloy element mixed powder in step 1 as the raw material powder, the TC4-like titanium alloy is prepared by the laser stereoforming method; the preparation process of the laser stereoforming method is as follows: The raw material powder is clad and deposited on the surface of the TC4 titanium alloy substrate to form a deposition body with a height of 20mm, and the deposition body is separated from the TC4 titanium a...

Embodiment 2

[0051] The difference between this example and Example 1 is that the TC4-like titanium alloy consists of the following components in mass percentage: Mo 1.98%, Al 6.79%, V 4.51%, and the balance is Ti and unavoidable impurities.

[0052] Figure 2a It is the macroscopic grain morphology figure of the class TC4 titanium alloy of the present embodiment, from Figure 2a It can be seen that the solidification structure of the TC4-like titanium alloy in this example presents the characteristics of a coarse columnar grain texture growing in the direction.

[0053] Figure 2b Be the optical microscope figure of the class TC4 titanium alloy of the present embodiment, from Figure 2b It can be seen that the microstructure of the TC4-like titanium alloy in this embodiment is a basket structure composed of fine α and β.

[0054] Figure 2c Be the SEM intragranular microstructure diagram (10000×) of the class TC4 titanium alloy of the present embodiment, from Figure 2c It can be se...

Embodiment 3

[0056] The difference between this example and Example 1 is that the TC4-like titanium alloy consists of the following components in mass percentage: Mo 1.49%, Al 5.94%, V 3.96%, and the balance is Ti and unavoidable impurities.

[0057] Figure 3a It is the macroscopic grain morphology figure of the class TC4 titanium alloy of the present embodiment, from Figure 3a It can be seen that the solidification structure of the TC4-like titanium alloy in this example presents the characteristics of a coarse columnar grain texture growing in the direction.

[0058] Figure 3b Be the optical microscope figure of the class TC4 titanium alloy of the present embodiment, from Figure 3b It can be seen that the microstructure of the TC4-like titanium alloy in this embodiment is acicular martensite composed of fine α and β phases.

[0059] Figure 3c Be the SEM intragranular microstructure diagram (10000×) of the class TC4 titanium alloy of the present embodiment, from Figure 3c It c...

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Abstract

The invention discloses quasi-TC4 titanium alloy for laser additive manufacturing application. The quasi-TC4 titanium alloy for laser additive manufacturing application comprises, by mass percentage,1%-2% of Mo, 5.5%-6.8% of Al, 3.5%-4.5% of V and the balance Ti and inevitable impurities. The quasi-TC4 titanium alloy is obtained in the mode that dried pre-alloyed powder or dried element mixed powder of the quasi-TC4 titanium alloy are manufactured according to a laser additive manufacturing method. The Mo is added to the quasi-TC4 titanium alloy, the synergistic effects that intracrystallinealpha battens are thinned, and the alpha-phase volume fraction is increased are effectively achieved under the action of the heat cycle of laser additive manufacturing, and the strength and the plasticity of the quasi-TC4 titanium alloy are improved. According to the quasi-TC4 titanium alloy for laser additive manufacturing application, the manufacturing technology is simple, the operation response is fast, machining is easy, crucibles or other electrode materials are not required in the manufacturing process, and alloy elements are prevented from being contaminated.

Description

technical field [0001] The invention belongs to the technical field of metal additive manufacturing, and in particular relates to a TC4-like titanium alloy oriented to the application of laser additive manufacturing. Background technique [0002] Due to its high specific strength, excellent heat resistance, and excellent corrosion resistance, titanium alloys are often widely used in aerospace and other fields. However, at present, parts are gradually becoming integrated, large-scale, and complex. Traditional manufacturing methods (casting, forging, rolling, etc.) have limitations such as long production cycles, low material utilization, and high costs, making titanium alloys not very good. adhere to traditional manufacturing methods. Therefore, the preparation of titanium alloys by the current advanced laser additive manufacturing technology has been well developed. Laser additive manufacturing technology can realize the near-net shape of complex parts, and the production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00B22F1/00B22F3/105C22C1/04B33Y10/00B33Y70/00
CPCB22F1/0003C22C14/00C22C1/0458B33Y10/00B33Y70/00B22F10/00B22F1/14B22F10/32B22F10/34B22F10/25B22F10/28Y02P10/25
Inventor 张凤英黄开虎高盼盼胡腾腾李尧孙志平
Owner CHANGAN UNIV
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