Heat treatment method for obtaining titanium alloy with high damage tolerance

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: 2022-05-27
北京煜鼎增材制造研究院有限公司
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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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  • Heat treatment method for obtaining titanium alloy with high damage tolerance
  • Heat treatment method for obtaining titanium alloy with high damage tolerance
  • Heat treatment method for obtaining titanium alloy with high damage tolerance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] For the TA15 titanium alloy with two-state structure after α + β forging, the phase change point is obtained after the phase change point test by the metallographic method is 995 °C, and then the same heat treatment furnace is applied, heated to 990 °C for 1 hour, then heated to 1005 °C for 20 minutes, the specimen is removed from the heat treatment furnace for 10 seconds, cooled to 985 °C, the heat treatment furnace temperature is set to 985 °C, the specimen is put back into the heat treatment furnace, and the furnace is closed and cooled to room temperature. After the two-stage annealing heat treatment, heated to 960 °C for 1 hour after air cooling to room temperature, and then reheated to 670 °C for 2 hours after air cooling to room temperature to obtain a bimorphic tissue containing tentacle-like primary α phase and β transformation tissue, wherein the tentacle-like primary α phase volume fraction of 32-37%, its tissue morphology is as follows Figure 2 as shown. The resul...

Embodiment 2

[0030] For the TC4 titanium alloy with mesh basket organization after laser additive manufacturing, the phase change point is obtained after the phase change point test by metallographic method is 1005 °C, and the α phase width is 2 μm, the same heat treatment furnace is applied, heated to 1000 °C for 1 hour, and then the furnace is closed and cooled to room temperature. After the two-stage annealing heat treatment, heated to 985 °C for 1 hour after air cooling to room temperature, and then reheated to 680 °C after 1.5 hours of air cooling to room temperature to obtain a bimorphic tissue containing tentacle-like primary α phase and β transformation tissue, wherein the volume fraction of the tentacle-like primary α phase is 30-33%, and its tissue morphology is as follows Figure 3 as shown. The resulting specimen is tested for its plane fracture toughness, K IC Reach 124MPa*m 1 / 2 , impact toughness a KU Reached 42-46J / cm 2 。 Damage tolerance is good.

Embodiment 3

[0032]For the forged TC4DT with coarse deformation Wei's structure, the α phase width is 7 μm, and the phase change point is obtained by the metallographic method of the phase change point test is 1000 °C, the same heat treatment furnace is applied, heated to 980 °C, and after 1 hour of heat preservation, air cooled to room temperature. It is then reheated to 650 °C, kept warm for two hours and then cooled to room temperature. Bimorphic tissues with tentacle-like α phases and β transformational tissues were obtained, and the volume fraction of the tentacle-like α phase reached 38-40%. Test on its plane fracture toughness, 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 high-damage-tolerance titanium alloy, which comprises the following steps: regulating and controlling the morphology of an original structure through beta heat treatment, and then regulating and controlling a double-state structure with a whisker-shaped primary alpha phase with the volume fraction of 10-40% and a beta transformation structure by adopting double annealing treatment, compared with an equiaxial alpha phase in a traditional double-state structure, the special whisker-shaped primary alpha phase has a larger specific surface area and a smaller size, so that crack initiation and growth can be hindered when the special whisker-shaped primary alpha phase faces damage crack propagation, fatigue crack propagation needs to advance for a larger distance along the primary alpha phase, and fatigue crack propagation can be inhibited. And therefore, compared with a traditional titanium alloy structure, the titanium alloy has higher fatigue crack propagation resistance and high-temperature creep resistance.

Description

Technical field [0001] The present invention relates to the field of titanium alloys, in particular to a heat treatment method for obtaining a titanium alloy with a high damage tolerance. Background [0002] Titanium alloy relies on its high specific strength, high strength, corrosion resistance, high temperature resistance and other excellent properties in the aerospace industry, shipbuilding industry, transportation and other fields are widely used, in the military aircraft, spacecraft and other national defense fields are widely used as key structural parts and difficult to replace, its dosage is considered to be one of the importance of aircraft, engines, etc. From the preparation to the application of titanium alloy components, heat treatment is one of the most important processes affecting the performance of titanium alloys. The desired performance can be obtained by regulating the heat treatment process and then regulating the topography of the tissue. Titanium alloy throu...

Claims

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Application Information

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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有限公司
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