Rolling method for reducing surface cracking of TC4 titanium alloy smelted in an EB furnace

A titanium alloy, rolling direction technology, applied in metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problem of inability to meet the requirements of the national standard, the high cost of titanium alloy sheets, and the cracked surface of the edge of the sheet. and other problems, to achieve uniform distribution of equiaxed structure, avoid surface cracks and edge cracks, and achieve the effect of fine equiaxed α phase

Inactive Publication Date: 2020-08-07
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process is long, and the slab is forged and opened, resulting in low production efficiency and high cost of titanium alloy plate
[0004] There will be defects such as loose structure inside the TC4 titanium alloy as-cast billet, resulting in a large gap between the quality and mechanical properties of the rolled plate and the plate rolled from the dense forging billet, which cannot meet the requirements of the national standard and the needs of various fields.
At the same time, if the heating temperature and rolling process control of TC4 titanium alloy are not accurate during the rolling process, the stress distribution will be uneven during the rolling process, and edge cracks and deep surface cracks will easily occur on the plate after rolling.

Method used

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  • Rolling method for reducing surface cracking of TC4 titanium alloy smelted in an EB furnace
  • Rolling method for reducing surface cracking of TC4 titanium alloy smelted in an EB furnace
  • Rolling method for reducing surface cracking of TC4 titanium alloy smelted in an EB furnace

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment reduces the rolling method of EB furnace smelting TC4 titanium alloy surface cracking, rolling process such as figure 1 As shown, the specific steps are as follows:

[0037] (1) For the TC4 titanium alloy of the present embodiment 1, the phase transition temperature of the alloy measured by the continuous heating method is 995° C.;

[0038] (2) Send the TC4 titanium alloy flat ingot to the heating furnace and heat it to 990°C with the furnace, and keep it warm for 50 minutes;

[0039] (3) The TC4 titanium alloy slab heated in step (2) is subjected to first-fire rolling, and the rolling speed is 1.1m / s, and is reciprocally rolled along the direction perpendicular to the grain growth direction, and the amount of deformation per pass is 16%. , 6 rolling passes, cumulative deformation 65%;

[0040] (4) Send the blank rolled in step (3) to a heating furnace and heat it to 970°C with the furnace, and keep it warm for 50 minutes;

[0041] (5) The billet afte...

Embodiment 2

[0049] This embodiment reduces the rolling method of EB furnace smelting TC4 titanium alloy surface cracking, rolling process such as figure 1 As shown, the specific steps are as follows:

[0050] (1) For the TC4 titanium alloy of the present embodiment 2, the phase transition temperature of the alloy measured by the continuous heating method is 995° C.;

[0051] (2) Send the TC4 titanium alloy flat ingot to the heating furnace and heat it to 980°C with the furnace, and keep it warm for 40 minutes;

[0052] (3) The TC4 titanium alloy flat ingot heated in step (2) is subjected to first-fire rolling, and the rolling speed is 0.8m / s, and is reciprocally rolled along the direction perpendicular to the grain growth direction, and the amount of deformation per pass is 21% , 4 rolling passes, accumulative deformation 61%;

[0053] (4) Send the billet after step (3) rolling to the heating furnace and heat it to 955°C with the furnace, and keep it warm for 40min;

[0054] (5) The bi...

Embodiment 3

[0062] This embodiment reduces the rolling method of EB furnace smelting TC4 titanium alloy surface cracking, rolling process such as figure 1 As shown, the specific steps are as follows:

[0063] (1) The TC4 titanium alloy of the present embodiment 3, adopting the continuous heating method to record the phase transition temperature of the alloy is 995°C;

[0064] (2) Send the TC4 titanium alloy flat ingot to the heating furnace and heat it to 970°C with the furnace, and keep it warm for 60 minutes;

[0065] (3) The TC4 titanium alloy flat ingot heated in step (2) is subjected to first-fire rolling at a rolling speed of 0.5m / s, reciprocatingly rolling along the direction perpendicular to the grain growth, and the amount of deformation per pass is 16% , 6 rolling passes, cumulative deformation 65%;

[0066] (4) Send the blank rolled in step (3) to a heating furnace and heat it to 940°C with the furnace, and keep it warm for 60 minutes;

[0067] (5) The billet after step (4) ...

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Abstract

The invention discloses a rolling method for reducing the surface cracking of a TC4 titanium alloy smelted in an EB furnace, and belongs to the field of plastic forming. According to the rolling method, a TC4 titanium alloy cast-state slab ingot is directly rolled into a high-quality plate through the method of combination of direct rolling and recrystallization annealing heat , so that on one hand, the production process flow of the TC4 titanium alloy is shortened, and the machining cost is reduced; and on the other hand, the side portion cracking and central surface cracks in the titanium alloy rolling process are reduced, the surface quality of a finished plate is good, and the high-quality TC4 titanium alloy plate is finally obtained.

Description

technical field [0001] The invention belongs to the field of plastic forming, in particular to a rolling method for reducing surface cracking of TC4 titanium alloy melted in an EB furnace. Background technique [0002] TC4 titanium alloy is a typical (α+β) two-phase titanium alloy, which has the characteristics of high strength, good corrosion resistance and excellent welding performance, and is widely used in aerospace and other fields. Alloy cold rolling forming is difficult and easy to surface cracking, and the production cost is too high, which limits the application of TC4 titanium alloy. [0003] The main process of domestic titanium TC4 alloy plate production is that the cast billet is forged for multiple times, and then rolled into plate by two-roll groove rolling, step rolling, profile roll skew rolling, Y-rolling and other methods. The production process is long, and the slab is forged and opened, resulting in low production efficiency and high cost of titanium al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B3/00B21B45/00C21D1/26C21D9/46
CPCB21B1/22B21B3/00B21B45/004C21D1/26C21D9/46B21B2001/225B21B2261/20B21B2275/06
Inventor 王伟宫鹏辉张卫强张志波朱羽张浩泽史亚鸣黄海广王快社
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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