A kind of heat treatment method to obtain high damage tolerance titanium alloy

A heat treatment method and damage tolerance technology, applied in the field of titanium alloys, can solve problems such as difficulty in meeting high damage tolerance, and achieve the effects of high temperature creep performance, large specific surface area, and high resistance to fatigue crack growth

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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the traditional heat treatment process is difficult to meet the requirements of high damage tolerance

Method used

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  • A kind of heat treatment method to obtain high damage tolerance titanium alloy
  • A kind of heat treatment method to obtain high damage tolerance titanium alloy
  • A kind of heat treatment method to obtain high damage tolerance titanium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] For the TA15 titanium alloy with dual-state structure after α+β forging, the phase transition point was measured by metallographic method to obtain a phase transition point of 995 °C, and then the same heat treatment furnace was applied, heated to 990 °C for 1 hour, and then heated Keep the temperature at 1005 °C for 20 minutes, take the sample out of the heat treatment furnace and cool it in air for 10 seconds, cool it to 985 °C, set the temperature of the heat treatment furnace to 985 °C, put the sample back into the heat treatment furnace, turn off the furnace and cool it to room temperature. After that, double-stage annealing heat treatment was carried out, heated to 960 °C for 1 hour, then air-cooled to room temperature, and then heated to 670 °C for 2 hours, and then air-cooled to room temperature to obtain a two-state structure with tentacle-like primary α phase and β transition structure. , the volume fraction of the tentacle-like primary α phase is 32-37%, and i...

Embodiment 2

[0030] For the TC4 titanium alloy with a mesh basket structure after laser additive manufacturing, the phase transition point is 1005°C after the phase transition point test by the metallographic method, and the α phase width is 2μm. The same heat treatment furnace is used to heat it to 1000°C Incubate for 1 hour, then turn off the stove and cool to room temperature. After that, double-stage annealing heat treatment was carried out, heated to 985 °C for 1 hour, then air-cooled to room temperature, then heated to 680 °C for 1.5 hours, and then air-cooled to room temperature to obtain a two-state structure with tentacle-like primary α phase and β transition structure. , the volume fraction of the tentacle-like primary α phase is 30-33%, and its microstructure is as follows image 3 shown. The obtained samples were tested for their plane fracture toughness, K IC Up to 124MPa*m 1 / 2 , impact toughness a KU Reached 42-46J / cm 2 . Damage tolerance performance is good.

Embodiment 3

[0032] For the forged TC4DT with coarsely deformed Widmandelstein microstructure, the width of the α phase is 7 μm, and the phase transition point is 1000 °C obtained by the metallographic method. The same heat treatment furnace is used, heated to 980 °C, and after holding for 1 hour, air-cooled to room temperature . Subsequently, it was heated to 650°C, kept for two hours, and then air-cooled to room temperature. A dual-state structure with a tentacle-like α phase and a β-transition structure was obtained, and the volume fraction of the tentacle-like α phase reached 38-40%. Its plane fracture toughness test, K IC Reached 130MPa*m 1 / 2 , the impact toughness reached 48J / cm 2 . Excellent damage performance.

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Abstract

The invention discloses a heat treatment method for obtaining a titanium alloy with high damage tolerance. The original microstructure morphology is controlled by β heat treatment, and then double annealing is used to control a tentacle-like primary α phase with a volume fraction of 10%-40%. As well as the dual-state structure of the β-transition structure, this special tentacle-like primary α-phase has a larger specific surface area and smaller size than the equiaxed α-phase in the traditional dual-state structure, which can face damage and crack growth. At the same time, it hinders the initiation and growth of cracks, so that the fatigue crack growth needs to travel a larger distance along the primary α phase, which can make it have higher resistance to fatigue crack growth and high temperature creep performance than the traditional titanium alloy structure.

Description

technical field [0001] The invention relates to the field of titanium alloys, in particular to a heat treatment method for obtaining high damage tolerance titanium alloys. Background technique [0002] Titanium alloys are widely used in the aerospace industry, shipbuilding industry, transportation and other fields due to their high specific strength, high strength, corrosion resistance, high temperature resistance and other excellent properties, and are widely used in military aircraft, spacecraft and other defense fields. Structural parts are difficult to replace, and its dosage is considered to be one of the important performance reference indicators for aircraft and engines. From the preparation to the application of titanium alloy components, heat treatment is one of the most important processes affecting the properties of titanium alloys. The desired properties can be obtained by adjusting the heat treatment process to control the microstructure and morphology. Titani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C21D1/26
CPCC22F1/183C21D1/26Y02P10/25
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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