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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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 impro

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

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0016] Example 1

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

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

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

Example Embodiment

[0020] Example 2

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

[0022] Put the TC4-DT titanium alloy bar at a temperature of (T β +20)℃, keep for 2h and then air-cooled, then at the temperature (T β -20) ℃ heat preservation for 2h and then air cooling, and finally at 500 ℃ heat preservation for 5h and then air cooling; the T β Is the β phase transition temperature of TC4-DT titanium alloy bar, T β The unit is °C.

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

Example Embodiment

[0024] Example 3

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

[0026] Put the TC4-DT titanium alloy bar at a temperature of (T β +40)℃, keep for 1h and then air-cooled, then at the temperature of (T β -40) The temperature is kept at a temperature of 1h and then the furnace is cooled, and finally at a temperature of 600°C, the temperature is kept for 7 hours and then air-cooled; the T β Is the β phase transition temperature of TC4-DT titanium alloy bar, T β The unit is °C.

[0027] Table 1 shows the performance test data of the TC4-DT titanium alloy bar 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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