Forging method for improving axial structure uniformity of large titanium alloy bar

A technology with uniform structure and large size, applied in the field of titanium alloy forging, can solve the problems of aggravated non-uniformity, excessive free end of the head and bottom of the bar, fluctuation of the structure and properties of the bar, etc., to reduce the cumulative deformation and improve the β The effect of grain size uniformity, improvement of microstructure and property anisotropy

Active Publication Date: 2022-07-22
湖南湘投金天钛业科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, upsetting forging is a kind of non-uniform deformation, and there is an obvious deformation dead zone, which leads to the unevenness along the axial direction of the bar, such as large fluctuations in the structure and performance of different parts along the length direction, and the free end of the bar head is too large. Uniformity problem, while the large deformation zone and deformation dead zone are relatively fixed in the process of repeated upsetting and drawing forging with fixed height-to-diameter ratio, which will further aggravate the unevenness of deformation along the axial direction, and the larger the forging billet size, the greater the unevenness

Method used

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  • Forging method for improving axial structure uniformity of large titanium alloy bar
  • Forging method for improving axial structure uniformity of large titanium alloy bar

Examples

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Embodiment 1

[0027] In this example, the raw material is a TC18Φ680mm ingot, the phase transition temperature of the ingot measured by metallographic method is 865°C, and the finished product is a Φ500mm large-sized bar. The ingot is heated to 1150°C, and after the heat preservation, a 45MN fast forging machine is used to spheronize the ingot to Φ610×~1780mm (indicating that the shaped blank is a cylinder with a diameter of 610mm and a length of about 1780mm, because the spheronization forging process controls the size of the blank. Diameter, so 610mm is an accurate control value, and the length is an estimated value, not a forging control value, the "~" in front of the number means "approximately equal to"), air cooling after forging; ②Single-phase area forging: Reshape the billet The obtained billet was forged in single-phase zone for 4 times. The heating temperature of each heat was 1080°C, 1050°C, 1000°C, and 950°C. After each heat, a 45MN fast forging machine was used for 2 upsetting a...

Embodiment 2

[0029]In this example, the raw material is a TC11Φ680mm ingot, the phase transition temperature of the ingot is 1000°C measured by metallographic method, and the finished product is a Φ350mm large-sized bar. The ingot is heated to 1170°C. After the heat preservation is completed, the ingot is spheronized to Φ590×~1530mm using a 45MN fast forging machine (same as above, 590mm is an accurate control value, while the length of 1530mm is an estimated value, not a forging control value. The preceding "~" means "approximately equal to"), air cooling after forging; ②Single-phase zone forging: The billet obtained after blanking and shaping is forged in single-phase zone for 4 times, and the heating temperature for each fire is 1100℃, 1080℃. ℃, 1050℃, 1050℃, 45MN fast forging machine is used for 2 upsetting and 2 pulling after each heating, the upsetting deformation is controlled between 40~45%, and the drawing deformation is controlled at 38~43 Between %, the upsetting deformation of ...

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Abstract

The invention relates to the technical field of titanium alloy forging, and particularly discloses a forging method for improving the axial structure uniformity of a titanium alloy large-specification bar, which is specifically realized through shaping before cogging, single-phase region forging, two-phase region forging, finished product forging and the like. According to the method, the height-diameter ratio of the blank in the single-phase region upsetting and drawing forging process is adjusted, and the blank is transited from slight double-drum and no obvious drum property to slight single-drum in the upsetting and drawing process, so that the axial deformation uniformity of the single-phase region of the blank is improved, and the size uniformity of beta grains at different parts is improved; by adjusting the height-diameter ratio of the blank in the upsetting and drawing forging process of the two-phase region, the blank is transited from slight single drum and no obvious drum property to slight double drum in the upsetting and drawing process, so that the axial deformation uniformity of the two-phase region of the blank is improved, and the alpha-phase ball rate consistency of different parts is improved.

Description

technical field [0001] The invention relates to the technical field of titanium alloy forging, in particular to a forging method for improving the uniformity of the axial structure of a large-sized titanium alloy bar. Background technique [0002] Titanium alloys are widely used in aviation, aerospace, marine equipment, weapons, petrochemical and other fields due to their high specific strength, high toughness, excellent corrosion resistance and heat resistance, and non-magnetic properties. With the continuous upgrading of various types of equipment, titanium alloy forgings have gradually developed from small forgings splicing to large forgings as a whole, and the service environment is becoming more and more severe. higher requirement. [0003] The traditional production method of titanium alloy bars is usually to use a fixed height-diameter ratio to make the billet in the single-phase area and the two-phase area for multiple times of repeated upsetting and forging, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J5/06C22F1/18
CPCB21J5/00B21J5/06C22F1/183
Inventor 詹孝冬樊凯李超冯继才伍云韬
Owner 湖南湘投金天钛业科技股份有限公司
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