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Spray heat treatment method for large titanium alloy components

A heat treatment method and titanium alloy technology, applied in the field of titanium alloy, can solve the problems of large thickness difference, low thermal conductivity of titanium alloy, large difference in sample structure and performance, etc., and achieve high uniformity and high resistance to fatigue crack growth Effect

Active Publication Date: 2022-07-15
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, the typical structures of traditional titanium alloys are difficult to meet the requirements of high damage tolerance, so it is necessary to develop a new heat treatment method for high damage tolerance properties.
For large titanium alloy components, due to the great difference in the thickness of each area of ​​the component, the thermal conductivity of the titanium alloy is very low, which leads to a large difference in the rate of temperature change in different areas of the component, resulting in a large difference in the structure and properties of the sample in different areas

Method used

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  • Spray heat treatment method for large titanium alloy components
  • Spray heat treatment method for large titanium alloy components
  • Spray heat treatment method for large titanium alloy components

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Embodiment

[0030] For the large aircraft structural parts of TA15 titanium alloy with a mesh basket structure after laser additive manufacturing, the phase transition point was tested by metallographic method, and the phase transition point was 995 ℃, and then the same heat treatment furnace was used to heat it to 975 ℃ for 1 Then, the sample was taken out of the heat treatment furnace and air-cooled for 60 seconds. The components mainly have three cross-sectional thicknesses, 30mm, 60mm and 120mm, respectively. The nozzle with an inner diameter of 15mm is selected, and the water flow rate Q is selected respectively. 1 It is 0.18 liters / second, 0.72 liters / second and 2.88 liters / second, and the spray time is 18 seconds, 36 seconds and 72 seconds respectively. Then increase the flow rate, Q 2 Select 0.36 liter / sec, 1.44 liter / sec, and 5.76 liter / sec, respectively, and cool to room temperature. Then, the component was heated to 670°C, kept for 2 hours, and then cooled to room temperature ...

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Abstract

The invention discloses a heat treatment method for a large-scale titanium alloy component, comprising: 1) first heating the large-scale titanium alloy component to 500° C. to 650° C. and maintaining the temperature for 10-20 minutes; and then heating the large-scale titanium alloy component to below the beta transformation point 150°C for 10-15 minutes; 2) Then the large titanium alloy components are reheated to 15-30°C below the β transformation point for 1-2 hours; 3) Then the large titanium alloy components are removed from the heat treatment furnace for spray temperature control For the cooling treatment, the cooling rate should be controlled at 10~30℃ / s in the overall cooling process; 4) Then the large titanium alloy components are heated to 600℃~700℃ for annealing treatment, kept for 1~3 hours, and then cooled to room temperature. The novel spray heat treatment method of the present invention adjusts the cooling liquid flow rate in different thickness areas of the component, monitors the component temperature in real time, and makes the cooling rate of each area of ​​the whole component consistent, and obtains a component with uniform structure and performance.

Description

technical field [0001] The invention relates to the field of titanium alloys, in particular to a heat treatment method for titanium alloys, in particular to a spray heat treatment method for large titanium alloy components. Background technique [0002] Titanium alloy is one of the most important structural materials in modern aerospace and other high-end industries due to its high strength, low density, high modulus, corrosion resistance and other properties. The ability to prepare large titanium alloy structural parts is an important indicator of a country's national defense strength. With the development of modern industry, large-scale national defense equipment relies heavily on large-scale titanium alloy components. From the preparation, processing and application of titanium alloy components, heat treatment is one of the most important links affecting the performance of components. Appropriate heat treatment process can control the structure of titanium alloy, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22F1/183C22F1/002
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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