A method for preparing gradient microstructure of high-strength and toughness tc21 titanium alloy

A TC21, gradient microstructure technology, applied in the field of alloy materials, can solve the problems of difficulty in preparing small samples, complicated preparation process, and difficult operation, and achieve the effect of large-scale industrial promotion value, simple operation, and simple equipment.

Active Publication Date: 2021-07-20
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the equipment required by the above method is very expensive, and the preparation process is relatively complicated, the operation is difficult, and it is difficult to prepare small samples

Method used

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  • A method for preparing gradient microstructure of high-strength and toughness tc21 titanium alloy
  • A method for preparing gradient microstructure of high-strength and toughness tc21 titanium alloy
  • A method for preparing gradient microstructure of high-strength and toughness tc21 titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Select a TC21 titanium alloy plate-shaped sample with a length of about 80 mm, and use metallographic sandpaper to polish the surface of the plate-shaped titanium alloy sample; then use absolute ethanol to moisten the absorbent cotton to wipe the sample, and dry it for later use, as figure 1 shown;

[0037] (2) Connect the plate sample to the positive and negative copper plate electrodes of the pulse power supply, and put it into the glove box;

[0038] (3) vacuumize the glove box, the vacuum degree is 4KPa, then fill the glove box with an argon atmosphere, keep the air pressure at 80KPa, to prevent the sample from being oxidized;

[0039] (4) Turn on the pulse power supply, turn on the pulse power switch, adjust the pulse voltage to 67V, the pulse current to 78A, and the pulse frequency to 550Hz. The heating time is 1 minute, and the real-time temperature is tested by an infrared thermometer, kept at 1000°C for 5 minutes, and then air-cooled to room temperature; ...

Embodiment 2

[0043] (1) Select a TC21 titanium alloy round bar sample with a diameter of 11 mm and a length of about 80 mm, first process it into a round bar shape by a lathe, and then polish the surface of the sample with metallographic sandpaper; then use absolute ethanol to moisten the absorbent cotton to wipe the sample, and dried for later use, such as Figure 4 shown;

[0044] (2) Connect the sample to be heat treated with the positive and negative copper plate electrodes of the pulse power supply, and put it into the glove box;

[0045] (3) Vacuumize the glove box, and the vacuum degree is 4KPa, then pass the argon atmosphere into the glove box, keep the air pressure at 80KPa, protect the sample to be heat-treated, and prevent it from being oxidized;

[0046] (4) Turn on the power and turn on the pulse power switch. Adjust the pulse voltage to 75V, the pulse current to 80A, and the pulse frequency to 600Hz. The heating time is 1.5 minutes, and the real-time temperature is measure...

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Abstract

The invention provides a method for preparing a high-strength and toughness TC21 titanium alloy gradient structure. A pulse current is applied to a TC21 titanium alloy rod or plate, and local heating is performed by resistance. By controlling parameters such as pulse voltage, pulse current, and pulse frequency, the A temperature gradient is generated in the TC21 titanium alloy rod sample or plate sample. By controlling the width of the temperature gradient and the holding time, the gradient structure is finally obtained at room temperature. The invention does not need to change the composition of the alloy, and can produce an integral structure including the original material structure, the gradient structure in the transition zone and the lamellar structure, and realizes the improvement of the comprehensive performance of the material while retaining the superior performance of the original material. The method is simple in operation, simple in equipment, environmentally friendly and economical, not only improves production efficiency, but also reduces energy consumption, and has great industrial promotion value.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a method for preparing a gradient structure of a high-strength and tough TC21 titanium alloy. Background technique [0002] High-strength and tough titanium alloys have been receiving extensive attention at home and abroad due to their high strength, excellent corrosion resistance, high fatigue damage resistance, and lower density compared with steel, nickel-based alloys, and cobalt alloys. Especially in the past ten years, with the continuous development of smelting, thermal processing technology and equipment, high-strength and tough titanium alloys have been successfully used in the aerospace field, such as important parts such as aircraft landing gear, wing spars and engines. High-strength and tough titanium alloy structural parts are inevitably subjected to complex and periodic stress during service, which leads to deformation damage of this type of alloy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22F1/02
CPCC22F1/02C22F1/183
Inventor 谭长生张国君任帅
Owner XIAN UNIV OF TECH
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