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Heat treating method of TC4-DT titanium alloy bar

A technology of TC4-DT, heat treatment method, applied in the field of titanium alloy material processing, can solve the problems of damage, tensile plasticity reduction, material plasticity loss, etc., to achieve the effect of improving fracture toughness, good fracture toughness, and improving plasticity

Inactive Publication Date: 2014-12-17
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Application Information

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Problems solved by technology

[0003] In order to obtain high damage tolerance performance, the traditional heat treatment method of TC4-DT titanium alloy rod is mainly to carry out solid solution treatment on the sample in the β phase region, and improve the fracture toughness of the alloy through the obtained lamellar structure, but the coarse The lamellar structure will lead to a significant decrease in tensile plasticity, resulting in the loss of material plasticity

Method used

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  • Heat treating method of TC4-DT titanium alloy bar
  • Heat treating method of TC4-DT titanium alloy bar
  • Heat treating method of TC4-DT titanium alloy bar

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Experimental program
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Embodiment 1

[0017] The heat treatment method of the present embodiment TC4-DT titanium alloy bar is:

[0018] The TC4-DT titanium alloy rod is placed at a temperature of (T β +30) ℃ under the conditions of 1.5h after air cooling, and then at a temperature of (T β -30)°C for 1.5 hours after heat preservation, furnace cooling, and finally air cooling after heat preservation for 6 hours at 550°C; the T β is the β phase transition temperature of TC4-DT titanium alloy rod, T β The unit is ℃.

[0019] The metallographic structure of the TC4-DT titanium alloy bar after heat treatment in this embodiment is shown in figure 1 . See Table 1 for the performance test data of the TC4-DT titanium alloy rod after heat treatment in this embodiment.

Embodiment 2

[0021] The heat treatment method of the present embodiment TC4-DT titanium alloy bar is:

[0022] The TC4-DT titanium alloy rod is placed at a temperature of (T β +20) ℃ under the condition of insulation for 2h, air cooling, and then at the temperature of (T β Under the condition of -20) ℃, keep warm for 2 hours and then air-cool, and finally keep warm for 5 hours under the condition of 500 ℃ and then air-cool; the T β is the β phase transition temperature of TC4-DT titanium alloy rod, T β The unit is ℃.

[0023] See Table 1 for the performance test data of the TC4-DT titanium alloy rod after heat treatment in this embodiment.

Embodiment 3

[0025] The heat treatment method of the present embodiment TC4-DT titanium alloy bar is:

[0026] The TC4-DT titanium alloy rod is placed at a temperature of (T β +40) ℃ under the condition of insulation for 1h, air cooling, and then at a temperature of (T β -40)°C for 1 hour and then furnace cooling, and finally at 600°C for 7 hours and then air cooling; the T β is the β phase transition temperature of TC4-DT titanium alloy rod, T β The unit is ℃.

[0027] See Table 1 for the performance test data of the TC4-DT titanium alloy rod after heat treatment in this embodiment.

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Abstract

The invention provides a heat treating method of a TC4-DT titanium alloy bar. The method comprises the steps that the TC4-DT titanium alloy bar is firstly subjected to air cooling after being subjected to heat preservation for 1-2h under the condition that the temperature is (TBeta+5) DEG C to (TBeta+50) DEG C, is then subjected to air cooling or furnace cooling after being subjected to heat preservation for 1-2h under the condition that the temperature is (TBeta-80) DEG C to (TBeta-10) DEG C, and is finally subjected to air cooling after being subjected to heat preservation for 4-8h under the condition that the temperature is 500-600 DEG C, wherein TBeta is the Beta phase inversion temperature of the TC4-DT titanium alloy bar, and the unit of TBeta is DEG C. Through performing a three-stage heat treating process, the alloy plasticity of the TC4-DT titanium alloy bar is improved while the alloy fracture toughness of theTC4-DT titanium alloy bar is increased, the performance can be further enhanced, and excellent matching among the alloy intensity, plasticity and fracture toughness is finally realized.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a heat treatment method for TC4-DT titanium alloy rods. Background technique [0002] The damage tolerance performance of materials is mainly characterized by fracture toughness and crack growth rate. With the development of fracture mechanics and damage tolerance theory, the idea of ​​damage tolerance design has been paid attention to in material selection, and alloys with high fracture toughness and low crack growth rate have received extensive attention. Titanium alloys are the material of choice for aerospace applications due to a range of advantages. Many studies have shown that the lamellar structure of titanium alloy has good damage tolerance performance. Therefore, β forging or β heat treatment process is usually used as a processing method with high damage tolerance performance, but the lamellar structure has coarse grains so that ...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 郭萍赵永庆韩栋雷文光贾蔚菊张永强李磊
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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