Preparation method for large-specification TC4 titanium alloy ring piece

A titanium alloy, large-scale technology, applied in the field of preparation of large-scale TC4 titanium alloy rings, can solve the problems of affecting the mechanical properties of finished products, low material utilization, uneven structure, etc., to improve material utilization and fully deform the material The effect of uniformity and improvement of material utilization rate

Active Publication Date: 2017-02-22
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large size of the blank of the large-scale ring, there are often uneven structures and coarse grains inside the material, which affects the mechanical properties of the finished product
In addition, in order to ensure the performance and size requirements of large-scale rings, the stock margin is often large, which makes the utilization rate of materials low

Method used

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  • Preparation method for large-specification TC4 titanium alloy ring piece
  • Preparation method for large-specification TC4 titanium alloy ring piece
  • Preparation method for large-specification TC4 titanium alloy ring piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the large-scale TC4 titanium alloy ring of the present embodiment comprises the following steps:

[0028] Step 1. Heating the TC4 titanium alloy billet with a circular cross section and a specification of Ф400×350mm to the process temperature and keeping it warm, and then performing two-upsetting and two-drawing forging. 1 = heating coefficient η 1 ×δ 1 ,δ 1 Be the cross-sectional diameter of described TC4 titanium alloy billet, unit is mm, heating coefficient η 1 =0.6, holding time t 1 =240min; the deformation of each upsetting during the two-upsetting and two-drawing forging process is 50%, the final forging temperature of the two-upsetting and two-drawing forging is not lower than 800°C, and after the two-upsetting and two-drawing forging The TC4 titanium alloy blank returns to its original height; the initial microstructure of the TC4 titanium alloy blank is α 等轴 +β 转变 Two-phase structure, the process temperature is 20°C below the tra...

Embodiment 2

[0040] The preparation method of the large-scale TC4 titanium alloy ring of the present embodiment comprises the following steps:

[0041] Step 1. Heating the TC4 titanium alloy billet with a circular cross section and a specification of Ф350×280mm to the process temperature and keeping it warm, and then performing two-upsetting and two-drawing forging. 1 = heating coefficient η 1 ×δ 1 ,δ 1 Be the cross-sectional diameter of described TC4 titanium alloy billet, unit is mm, heating coefficient η 1 =0.6, holding time t 1 =210min; the deformation of each upsetting during the two-upsetting and two-drawing forging process is 40%, the final forging temperature of the two-upsetting and two-drawing forging is not lower than 800°C, and after the two-upsetting and two-drawing forging The TC4 titanium alloy blank returns to its original height; the initial microstructure of the TC4 titanium alloy blank is α 等轴 +β 转变 Two-phase structure, the process temperature is 50°C below the tra...

Embodiment 3

[0053] The preparation method of the large-scale TC4 titanium alloy ring of the present embodiment comprises the following steps:

[0054] Step 1. Heating the TC4 titanium alloy billet with a circular cross section and a specification of Ф390×360mm to the process temperature and keeping it warm, and then performing two-upsetting and two-drawing forging. 1 = heating coefficient η 1 ×δ 1 ,δ 1 Be the cross-sectional diameter of described TC4 titanium alloy billet, unit is mm, heating coefficient η 1 =0.8, holding time t 1 =312min; the deformation of each upsetting during the two-upsetting and two-drawing forging process is 60%, the final forging temperature of the two-upsetting and two-drawing forging is not lower than 800°C, and after the two-upsetting and two-drawing forging The TC4 titanium alloy blank returns to its original height; the initial microstructure of the TC4 titanium alloy blank is α 等轴 +β 转变 Two-phase structure, the process temperature is 30°C below the tra...

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Abstract

The invention provides a preparation method for a large-specification TC4 titanium alloy ring piece. The preparation method comprises the following steps that (1) TC4 titanium alloy blanks are heated to a technical temperature and subjected to heat insulation, and the forging operations of two-upsetting and two-drawing are conducted; (2) the TC4 titanium alloy blanks are heated to the technical temperature and subjected to heat insulation, the operations of upsetting and punching are conducted, and a TC4 titanium alloy circular blank is obtained; (3) the TC4 titanium alloy circular blank is heated to the technical temperature and subjected to heat-insulation and then the broaching operation is conducted; (4) the TC4 titanium alloy circular blank is heated to the technical temperature and subjected to heat-insulation, and rolling operation is conducted; (5) the TC4 titanium alloy circular blank is heated to the technical temperature and subjected to heat-insulation, and after the TC4 titanium alloy circular blank is reshaped, air cooling operation is conducted; and (6) the TC4 titanium alloy circular blank is subjected to annealing treatment, and the large-specification TC4 titanium alloy ring piece with the external diameter being 720mm-1300mm is obtained. The large-specification TC4 titanium alloy ring piece prepared through the method consists of the alpha equiaxed phase and the beta transformed tissue, the microstructure is uniform and small, and the large-specification TC4 titanium alloy ring piece does not have an original beta crystal boundary and has high strength and good plasticity.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy processing, and in particular relates to a method for preparing a large-scale TC4 titanium alloy ring. Background technique [0002] TC4 titanium alloy has excellent comprehensive properties and is the most widely used two-phase titanium alloy. The ring materials prepared from it are also widely used in aircraft structural parts, and the required ring size is gradually increasing. Titanium alloy rings are usually first forged to obtain a billet, which is then rolled through a ring rolling mill. Due to the large size of the blank of the large-size ring, the structure of the material is often uneven and the grains are coarse, which affects the mechanical properties of the finished product. In addition, in order to ensure the performance and size requirements of large-scale rings, a large margin of blanks is often invested, which makes the utilization rate of materials low. Therefore, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 贾蔚菊毛小南张永强赵恒章郭萍侯红苗潘浩
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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