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A kind of high temperature and high strength titanium alloy and its additive preparation method

A technology of titanium alloy and additive manufacturing, which is applied in the field of laser additive manufacturing of titanium alloys, can solve problems such as complex and harsh working conditions of engine parts, easy cracking of alloys, internal structural defects, etc., to ensure performance and improve α-phase stability properties, excellent high temperature performance

Active Publication Date: 2022-07-29
北京煜鼎增材制造研究院股份有限公司
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Problems solved by technology

However, with the continuous improvement of the thrust-to-weight ratio and the temperature before the vortex of the aero-engine, the working conditions of the engine parts become more complex and harsh, and the temperature is getting higher and higher. Therefore, the TC11 titanium alloy is facing serious damage during use. High temperature oxidation and other issues
[0004] Although a higher aluminum content can improve the high-temperature strength and other properties of titanium alloys to a certain extent, excessive aluminum content is prone to segregation and other problems during the forming process of the alloy, resulting in internal structural defects, which become a problem during high-temperature use. The initial parts such as cracks and oxidation cause the overall failure of the parts, and at the same time, the alloy is extremely prone to cracking during forging, resulting in low yield

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  • A kind of high temperature and high strength titanium alloy and its additive preparation method
  • A kind of high temperature and high strength titanium alloy and its additive preparation method

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Embodiment 1

[0045] 1) Put TC11 powder (400g) and self-made aluminum alloy powder (100g, the composition is shown in Table 3) into the ball mill respectively, add 500g 440C wear-resistant steel balls of different sizes, fill with argon and seal the tank The whole ball milling process is carried out in an oxygen-free environment to avoid the rapid oxidation of the fresh surface generated during ball milling. Use the high-energy ball mill to premix for 30 min at 250 rpm to ensure that the alloy powder is mixed evenly, and then use 600 rpm for high-energy ball milling for 50 hours. During high-energy ball milling, the tank is air-cooled, and at the same time, the ball is milled for 2.5 hours and suspended for 15 minutes to prevent the powder from overheating and affecting the grain refinement. After the ball milling is completed, the ball milled powder is sieved with a 100 mesh screen to obtain 0-100 mesh powder to ensure the metallurgical quality of thermomechanical consolidation; then the s...

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Abstract

The invention discloses a high-temperature and high-strength titanium alloy and an additive preparation method thereof. The high-strength titanium alloy of the present invention comprises, in terms of mass percentage, 80-88% Ti; 8%-14.5% Al; 2.8-3.8% Mo; 0.8- 2.0%Zr; 0.2-0.5%Si; 1.2-1.3%Mn; 0.7-1%Zn; 0.1-0.3%Cu. The high-strength titanium alloy of the present invention adopts a high-energy beam additive manufacturing method for directional deposition, designs a titanium alloy suitable for additive manufacturing based on the specific composition of TC11, and utilizes the characteristics of additive manufacturing of small molten pools and high cooling rates to reduce elements The segregation of the alloy makes the distribution of alloy elements uniform, which significantly improves the high-temperature mechanical properties of the titanium alloy.

Description

technical field [0001] The invention relates to a method for manufacturing a titanium alloy by laser additive, in particular to a high-strength titanium alloy and a method for preparing the additive. Background technique [0002] Titanium alloys have been widely used in aerospace, ships, automobiles, chemicals, medical equipment and sporting goods. As far as the operating temperature of titanium alloys is concerned, the current maximum working temperature of titanium alloys has been increased from the initial 350 °C to 650 °C. [0003] TC11 titanium alloy is an α+β type titanium alloy, the specific composition is Ti-6.5Al-3.5Mo-1.5Zr-0.3Si. TC11 titanium alloy has high specific strength, good thermal processing performance, strong corrosion resistance, low thermal expansion coefficient and low thermal conductivity, and can be used for a long time at 500 ℃. However, with the continuous improvement of aero-engine thrust-to-weight ratio and vortex front temperature, the worki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/04B22F9/04B22F10/25B22F10/64B33Y10/00B33Y40/20B33Y70/00
CPCC22C14/00C22C1/0458B22F9/04B22F10/25B22F10/64B33Y10/00B33Y40/20B33Y70/00B22F2009/043
Inventor 不公告发明人
Owner 北京煜鼎增材制造研究院股份有限公司
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