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Preparation method of high-strength high-ductility titanium alloy

A titanium alloy and high plasticity technology, applied in the field of titanium alloys, can solve the problems of insufficient strength and plasticity of titanium alloys, and achieve the effects of improving strength and plasticity, overcoming long process flow and refining grain size.

Inactive Publication Date: 2017-07-21
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a high-strength and high-plasticity titanium alloy, so as to solve the problem of insufficient strength and plasticity of the titanium alloy produced by the traditional process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) The nominal β-transition temperature of TC4 titanium alloy is about 990°C, and the high-temperature deformation of TC4 titanium alloy is about 985°C, and the strain rate is 2s -1 about;

[0018] (2) After the TC4 titanium alloy is deformed at high temperature, it is cooled to about 900 ° C for 1 hour;

[0019] (3) Rapid water quenching of the stabilized TC4 titanium alloy;

[0020] (4) After water quenching, the TC4 titanium alloy was aged at 600°C for 2h, and air-cooled to room temperature.

[0021] The tensile strength of the TC4 titanium alloy rod and wire produced by the above steps reaches 1210MPa, and the elongation reaches 10.2%.

Embodiment 2

[0023] (1) High-temperature deformation of TC4 titanium alloy at about 980°C, with a strain rate of 0.1s -1 ;

[0024] (2) After the TC4 titanium alloy is deformed at high temperature, it is cooled to about 870°C and isothermally held for 3 hours;

[0025] (3) Rapid water quenching of the stabilized TC4 titanium alloy;

[0026] (4) Aging TC4 titanium alloy at 500°C for 3h after water quenching, and air cooling to room temperature;

[0027] The tensile strength of the TC4 titanium alloy rod and wire produced by the above steps reaches 1232MPa, and the elongation reaches 9.7%.

Embodiment 3

[0029] (1) High-temperature deformation of TC4 titanium alloy at about 975°C, with a strain rate of 0.001s -1 ;

[0030] (2) After the TC4 titanium alloy is deformed at high temperature, it is cooled to about 840°C and isothermally held for 6 hours;

[0031] (3) Rapid water quenching of the stabilized TC4 titanium alloy;

[0032] (4) After water quenching, the TC4 titanium alloy was aged at 400°C for 4 hours, and air-cooled to room temperature.

[0033] The tensile strength of the TC4 titanium alloy rod and wire produced by the above steps reaches 1196MPa, and the elongation reaches 10.5%.

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Abstract

The invention discloses a preparation method of a high-strength high-ductility titanium alloy and belongs to the technical field of titanium alloys. The preparation method comprises the following steps of: performing high-temperature deformation on the titanium alloy with a temperature interval which is 15 DEG C below the beta transition temperature Tbeta, wherein the strain rate is controlled within 3s<-1>; then cooling the titanium alloy subjected to high-temperature deformation to a temperature interval which is 80-150 DEG C below the beta transition temperature Tbeta for stabilized isothermal treatment for 0.5-6 hours and then performing fast water quenching; and air-cooling a water-quenched sample which is aged for 2-4 hours at 400-600 DEG C. The titanium alloy produced by the method disclosed by the invention is fine and uniform in tissue and meanwhile has high strength and ductility.

Description

technical field [0001] The invention relates to a preparation method of a high-strength and high-plasticity titanium alloy, belonging to the technical field of titanium alloys. Background technique [0002] Titanium alloys are widely used in various fields because of their high specific strength, corrosion resistance, heat resistance and many other advantages. With the continuous expansion of the application fields of titanium alloys, the demand and requirements for high-strength and high-plasticity titanium alloys continue to increase. At present, researchers use a variety of methods to improve the strength and plasticity of titanium alloys. Using the alloying method, adding Mo, Cr, V, Ta, Mn, Fe, Al and other elements, and adjusting the ratio of element content can improve the comprehensive performance of titanium alloys, but the composition change not only increases the production cost of titanium alloys, but also makes the process difficult increase. Heat treatment pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183C22F1/002
Inventor 周雪峰李旭敏方峰蒋建清朱小坤
Owner SOUTHEAST UNIV