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Preparation method of ultralow-temperature TA7ELI titanium alloy plate

A titanium alloy, ultra-low temperature technology, applied in metal rolling and other directions, to achieve a high degree of strong plasticity matching, improve ultra-low temperature deformation performance, and reduce manufacturing costs

Active Publication Date: 2018-12-18
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts high-temperature heat treatment and reverse rolling in which the rolling directions are perpendicular to each other for the TA7ELI titanium alloy slab, which provides a large deformation space for the twin deformation that dominates the deformation of the plate at ultra-low temperature, and eliminates the need for rolling. The texture produced during the processing process promotes the homogenization of the slab structure, and obtains TA7ELI titanium alloy plates for ultra-low temperature, which solves the production problem of TA7ELI titanium alloy plates for ultra-low temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment includes the following steps:

[0021] Step 1. Insulate the TA7ELI titanium alloy slab prepared by explosive compounding at a temperature of 30°C above the phase transition point of the TA7ELI titanium alloy for 3.5h, and then at a temperature of 50°C below the phase transition point of the TA7ELI titanium alloy for 0.5h. Complete the first heat treatment; the thickness of the TA7ELI titanium alloy slab is 150mm, the width is 1200mm, and the length is 1500mm;

[0022] Step 2. Carrying out the first heat rolling to the TA7ELI titanium alloy slab after the first heat treatment in step 1 to obtain the first semi-finished slab; the first fire rolling is unidirectional rolling, and the second fire rolling is There are 10 passes for one-fire rolling, and the deformation rates of each pass are: 6.7%, 9.3%, 12.6%, 12.6%, 13.4%, 11.9%, 12.2%, 10.8%, 8.6%, 5.7% , the total deformation rate of the first firing rolling is 67%, the finish rolling temperature is 800°...

Embodiment 2

[0029] This embodiment includes the following steps:

[0030] Step 1. Insulate the TA7ELI titanium alloy slab prepared by explosive compounding at a temperature of 50°C above the phase transition point of the TA7ELI titanium alloy for 4h, and then at a temperature of 30°C below the phase transition point of the TA7ELI titanium alloy for 0.8h to complete The first heat treatment; the thickness of the TA7ELI titanium alloy slab is 170mm, the width is 1000mm, and the length is 1300mm;

[0031] Step 2. Carrying out the first heat rolling to the TA7ELI titanium alloy slab after the first heat treatment in step 1 to obtain the first semi-finished slab; the first fire rolling is unidirectional rolling, and the second fire rolling is There are 11 passes in one fire rolling, and the deformation rates of each pass are: 5%, 6%, 13%, 11%, 9%, 8%, 8%, 8%, 7%, 6%. , 5%, the total deformation rate of the first fire rolling is 60%, the finish rolling temperature is 830 ℃, and the rolling speed...

Embodiment 3

[0038] This embodiment includes the following steps:

[0039] Step 1. Insulate the TA7ELI titanium alloy slab prepared by explosive compounding at a temperature of 80°C above the phase transition point of the TA7ELI titanium alloy for 4.5h, and then at a temperature of 10°C below the phase transition point of the TA7ELI titanium alloy for 1h to complete The first heat treatment; the thickness of the TA7ELI titanium alloy slab is 220mm, the width is 800mm, and the length is 1200mm;

[0040] Step 2. Carrying out the first heat rolling to the TA7ELI titanium alloy slab after the first heat treatment in step 1 to obtain the first semi-finished slab; the first fire rolling is unidirectional rolling, and the second fire rolling is There are 11 passes in one fire rolling, and the deformation rates of each pass are: 7%, 10%, 15%, 11%, 11%, 10%, 7%, 7%, 7%, 6% , 6%, the total deformation rate of the first fire rolling is 64%, the finish rolling temperature is 830 ℃, and the rolling sp...

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Abstract

The invention discloses a preparation method of an ultralow-temperature TA7ELI titanium alloy plate. The method comprises the following steps: (1) a TA7ELI titanium alloy plate blank is heated for thefirst time; (2) the TA7ELI titanium alloy plate blank is rolled as a first semi-finished plate blank after primary heating; (3) the first semi-finished plate blank is formed to a second semi-finishedplate blank through polishing, acid washing and cutting in sequence; (4) the second semi-finished plate blank is heated for the second time; (5) the second semi-finished plate blank is rolled as a second semi-finished plate blank after secondary heating; and (6) the second semi-finished plate blank is straightened after insulation, and is cooled in air to reach the room temperature to obtain theTA7ELI titanium alloy plate. The high-temperature heating treatment and the reversing rolling method are adopted to provide larger deformation space for twin deformation, in the leading deformation role, of the plate under ultralow temperature; and the plate blank structure uniformity is promoted to obtain the ultralow-temperature TA7ELI titanium alloy plate.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material preparation, and in particular relates to a preparation method of TA7ELI titanium alloy plate for ultra-low temperature. Background technique [0002] TA7ELI titanium alloy (composition is Ti-5Al-2.5Sn) is a single-phase α-titanium alloy, which has good corrosion resistance and high specific strength. When the interstitial elements of this alloy are extremely low, it can still With good toughness and comprehensive performance, it is an excellent alloy for ultra-low temperature. It can be used as an engineering material under the condition of liquid hydrogen and has been widely used in the aerospace field. [0003] At present, the main profiles of domestic TA7ELI titanium alloys used in the ultra-low temperature field are cakes and bars, and relevant standards have been formulated. However, the production cost of forgings is much higher than that of rolling, and the cost of subsequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/02B21B1/38
CPCB21B1/38B21B2001/386B21C37/02
Inventor 王瑞琴葛鹏谢英杰李鹏刘宇刘宇明周玉川闫建峰杨利
Owner WESTERN TITANIUM TECH
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