Processing method of fine-grain superplastic TA15 titanium alloy sheet

A processing method and technology of titanium alloy, applied in metal rolling, metal rolling stand, metal rolling mill stand, etc., can solve the problems of small cold rolling deformation, high processing cost, low superplastic performance, etc. The effect of small longitudinal property gap, high microstructure uniformity, and improved rolling efficiency

Active Publication Date: 2014-08-13
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of high strength, poor plasticity, and small cold rolling deformation of TA15 titanium alloy, the production of thin plates is difficult, especially the grain size and flatness of the plates are difficult to control, and the anisotropy control level is poor, resulting in TA15 The quality of titanium alloy sheets is unstable, the yield is low, and the superplasticity is not high, which limits the application of TA15 titanium alloy sheets in high-end fields
[0004] The traditional TA15 titanium alloy thin plate processing technology usually adopts unidirectional rolling. The direction of the plate does not change during the rolling process, and the grains deform along one direction during

Method used

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  • Processing method of fine-grain superplastic TA15 titanium alloy sheet
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  • Processing method of fine-grain superplastic TA15 titanium alloy sheet

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Embodiment 1

[0030] The processing method of the present embodiment fine-grained superplastic TA15 titanium alloy thin plate comprises the following steps:

[0031] Step 1. Place a TA15 titanium alloy slab with a thickness of 48mm in a heating furnace and keep it warm for 65min at a temperature of 920°C;

[0032] Step 2. The TA15 titanium alloy slab after heat preservation in step 1 is sent to the hot rolling mill for the first rolling. The specific process is: first pass the processing rate of 25%, 21.5%, 20.5%, and 20%. The thickness of the TA15 titanium alloy slab is rolled to 18mm, and then the thickness of the TA15 titanium alloy slab is rolled to 9mm with a pass processing rate of 19%, 17.5%, 14.5%, and 12%, to obtain the first semi-finished slab; The first rolling is unidirectional rolling;

[0033] Step 3, placing the first semi-finished slab described in step 2 in a heating furnace, and keeping it warm for 18 minutes at a temperature of 900° C.;

[0034]Step 4. The first semi-fi...

Embodiment 2

[0040] The processing method of the present embodiment fine-grained superplastic TA15 titanium alloy thin plate comprises the following steps:

[0041] Step 1. Place a TA15 titanium alloy slab with a thickness of 50mm in a heating furnace and keep it warm for 65min at a temperature of 910°C;

[0042] Step 2: Send the TA15 titanium alloy slab after heat preservation in step 1 into the hot rolling mill for first rolling. The thickness of the TA15 titanium alloy slab is rolled to 19mm, and then the thickness of the TA15 titanium alloy slab is rolled to 10mm with a pass processing rate of 18%, 15%, 14%, and 12%, to obtain the first semi-finished slab; The first rolling is unidirectional rolling;

[0043] Step 3, placing the first semi-finished slab described in step 2 in a heating furnace, and keeping it warm for 20 minutes at a temperature of 890°C;

[0044] Step 4. The first semi-finished slab after heat preservation in step 3 is sent to the hot rolling mill for second rolling...

Embodiment 3

[0050] The processing method of the present embodiment fine-grained superplastic TA15 titanium alloy thin plate comprises the following steps:

[0051] Step 1. Place a TA15 titanium alloy slab with a thickness of 54mm in a heating furnace and keep it warm for 70min at a temperature of 930°C;

[0052] Step 2. The TA15 titanium alloy slab after heat preservation in step 1 is sent to the hot rolling mill for the first rolling. The specific process is: first with 25%, 22.5%, 21%, 20% pass processing rate The thickness of the TA15 titanium alloy slab is rolled to 19.8mm, and then the thickness of the TA15 titanium alloy slab is rolled to 10mm with the pass processing rate of 18%, 16.5%, 15%, and 13%, to obtain the first semi-finished slab ; The first rolling is unidirectional rolling;

[0053] Step 3, placing the first semi-finished slab described in step 2 in a heating furnace, and keeping it warm for 25 minutes at a temperature of 890°C;

[0054] Step 4. The first semi-finished...

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Abstract

The invention provides a processing method of a fine-grain superplastic TA15 titanium alloy sheet. The processing method includes steps of firstly, heating a TA15 titanium alloy sheet blank; secondly, performing first rolling to obtain first semi-finished sheet blanks; thirdly, heating the first semi-finished sheet blanks; fourthly, performing second rolling to obtain second semi-finished sheet blanks; fifthly, manufacturing several second semi-finished sheet blanks into a ply rolling pack; sixthly, heating the ply rolling pack; seventhly, performing third rolling and annealing, performing alkaline washing, acid pickling, sanding and shearing after unpacking, and obtaining a fine-grain superplastic TA15 titanium alloy sheet. The fine-grain superplastic TA15 titanium alloy sheet processed by the processing method is uniform in texture, fine in grains and excellent in superplasticity and consistence of performance, and has excellent process controllability and stability in batch production.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a processing method for a fine-grained superplastic TA15 titanium alloy thin plate. Background technique [0002] Because of its high superplasticity, fine-grained titanium alloy can be processed into thin-walled structural parts by superplastic forming, and can widely replace various precision castings and forgings of aircraft. To the obvious weight reduction effect, greatly increase the payload. This type of component generally has the characteristics of high rib and thin belly, complex shape, and large projected area, which requires high tissue performance. [0003] TA15 titanium alloy has good comprehensive mechanical properties, and its strength, fracture toughness, fatigue limit, and stress corrosion resistance are slightly higher than TC4 titanium alloy. Important structural parts with high height and complex stress have been widely...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B37/22
Inventor 张永强韩栋毛小南雷文光侯红苗李磊贾蔚菊郭萍
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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