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Forging method for near alpha-type high-temperature aluminum alloy large-size bar

A high-temperature titanium alloy, large-scale technology, applied in the field of forging, can solve the problems of difficult forging process control, low yield, narrow forging window, etc., to avoid narrow forging window, improve cracking, and improve the effect of core deformation.

Active Publication Date: 2021-02-09
湖南湘投金天钛业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of narrow forging window, difficult forging process control, and low yield rate of the above-mentioned near-alpha high-temperature titanium alloy, the purpose of the present invention is to provide a near-alpha titanium alloy with uniform and fine equiaxed structure, good uniformity of ultrasonic flaw detection, and short forging process. Forging method of high-temperature titanium alloy Φ250~Φ500mm large-scale rods to improve microstructure uniformity and quality stability of near-α high-temperature titanium alloy large-scale rods

Method used

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  • Forging method for near alpha-type high-temperature aluminum alloy large-size bar
  • Forging method for near alpha-type high-temperature aluminum alloy large-size bar
  • Forging method for near alpha-type high-temperature aluminum alloy large-size bar

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Embodiment 1

[0035] Material: Ti55 titanium alloy, phase transition point: 1000℃, finished bar size: Φ400mm×L, main equipment: 45MN fast forging machine and three types of electric furnace. Contrast the production process scheme and detection results before and after the application of the present invention below:

[0036] (1) Forging process in the prior art:

[0037] (1) Ingot billet forging

[0038] Preheat the heating furnace to 800°C, put it into the ingot or billet and keep it warm for 1~2h, then slowly raise the temperature to 1100~1150°C, the heating coefficient is 0.3, forging 4 fires, the forging ratio of each fire is 4.5~7.0, upsetting Thickness-height-diameter ratio 1.8~2.3, upsetting reduction rate 10~25mm / s, reduction 100~150mm, air cooling after forging;

[0039] (2) Upsetting of α+β phase region

[0040] Heating at 980°C below the phase transition point, the heating coefficient is 0.6, forging for 5 fires, the forging ratio per fire is controlled at 1.6, the upsetting he...

Embodiment 2

[0060] Material: Ti60, phase transition point: 1045°C, finished forging size: Φ250mm×L, main equipment: 45MN fast forging machine and three types of electric furnace. Contrast the production process scheme and detection results before and after the application of the present invention below:

[0061] (1) Forging process in the prior art:

[0062] (1) Ingot billet forging

[0063] Preheat the heating furnace to 800°C, put it into the ingot or billet and keep it warm for 1~2h, then slowly raise the temperature to 1100~1150°C, the heating coefficient is 0.4, forging 3 fires, the forging ratio of each fire is 2.0~4.5, upsetting The rough reduction rate is controlled at 10mm / s~30mm / s, the reduction amount is 100~150mm, and air cooling after forging;

[0064] (2) Upsetting of α+β phase region

[0065] Preheat the heating furnace to 800°C, put it into ingot or billet and keep it warm for 1~2h, then slowly raise the temperature to 1025°C, the heating coefficient is 0.5, forging 4 f...

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Abstract

The invention discloses a forging method for a near alpha-type high-temperature aluminum alloy large-size bar. A process route of the forging method comprises the following steps: cast ingot upsettingand drawing, first-time alpha and beta phase region upsetting, dynamic beta re-crystallizing and processing, second-time alpha and beta phase region upsetting, alpha and beta phase region stretching,and alpha and beta phase region finished product rounding forming. Dynamic beta re-crystallizing processing is combined in a high-low-high-low forging process, process steps are reasonably designed,and process parameters such as a deformation temperature, deformation amount, a deformation rate and a slenderness ratio are scientifically matched, so that forging deformation of blank is performed to obtain the near alpha-type high-temperature aluminum alloy large-size bar, which has a small and uniform equiaxed structure in core part and side parts, and has good ultrasonic flaw detection uniformity of Phi 250 mm to Phi 500 mm; and moreover, the forging method is short in forging process, is good in yield and is suitable for industrial stable production.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to a free forging method for large-sized rods of Φ250-500mm near α-type high-temperature titanium alloy. Background technique [0002] Near α-type high-temperature titanium alloy material, the long-term use temperature can reach 500°C-600°C, and has good thermal strength and thermal stability. High-temperature titanium alloys replace steel or nickel-based superalloys for the manufacture of aero-engine compressor discs, blades, blisks, casings, etc., which can reduce the structural weight by about 40%, thereby significantly improving the thrust-to-weight ratio and performance of the engine. It has become one of the key materials with great application prospects in the manufacture of modern aero-engines. [0003] Due to the high degree of alloying of the near-α-type high-temperature titanium alloy, and it is mainly α-phase at room temperature, under the same deformation conditions (d...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21J5/08C22F1/18
CPCB21J5/008B21J5/08C22F1/183
Inventor 彭晖李超樊凯冯继才黄德超朱雪峰
Owner 湖南湘投金天钛业科技股份有限公司
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