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A Forging Method for Improving Microstructure Uniformity of Titanium Alloy Forging Billet

A uniform microstructure and titanium alloy technology, applied in the direction of metal processing equipment, etc., can solve the problems of high-magnification uneven structure, low-magnification "fork-shaped defects" in the cross-section of forging blanks, etc., to achieve high-magnification structure uniformity, clear grain boundaries, and increase forging cost effect

Active Publication Date: 2019-08-09
西安赛特思迈钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a forging method that improves the uniformity of the titanium alloy forging billet structure, so as to solve the problems of low-magnification "fork" defects and high-magnification structure unevenness in the cross-section of the forging billet caused by the traditional forging method

Method used

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  • A Forging Method for Improving Microstructure Uniformity of Titanium Alloy Forging Billet
  • A Forging Method for Improving Microstructure Uniformity of Titanium Alloy Forging Billet
  • A Forging Method for Improving Microstructure Uniformity of Titanium Alloy Forging Billet

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Embodiment 1

[0037] Example 1: For a TC20 two-phase titanium alloy ingot with a diameter of Φ380mm, the phase transition point of the alloy was measured at 1017°C by differential thermal method; Square forging billets with a side length of 170-190mm in cross-section (that is, square billets with a side length of 170mm-190mm in cross-section); secondary forging is carried out on the square billet, and the forging temperature is 997-1007°C, forging by four-sided forging To a square forging billet with a side length of 140-150 mm in cross section; rotate the billet at an angle of 45°, start to elongate from the original four corners and divide it into two pressings, one pressing to an approximate regular octagon, and the second pressing For a square forging blank with a side length of 100-105 mm, the final forging temperature is 890±5°C. The TC20 titanium alloy cross-section side length after forging of the present invention is the low-magnification structure of the square forging billet of 1...

Embodiment 2

[0038] Example 2: For a TC4 two-phase titanium alloy ingot with a diameter of Φ460 mm, the phase transition point of the alloy was measured at 971°C by differential thermal method; A square forging billet with a side length of 190-210 mm in cross-section; secondary forging is performed on the billet with a starting temperature of 951-961 °C, and a square forging billet with a side length of 150-160 mm in cross-section is forged by means of four-sided forging; Rotate the billet at an angle of 45°, start from the original four corners and divide it into two pressings, one pressing to an approximate regular octagon, and the second pressing to a square forging billet with a side length of 115-120 mm in cross section. The final forging temperature is 870±5°C. The TC4 titanium alloy cross-section side length after the forging of the present invention is the microstructure of the square forging billet of 120mm such as Figure 4 (edge) and Figure 5 As shown in (heart), they are all...

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Abstract

The invention discloses a forging method capable of improving structure uniformity of a titanium alloy forging stock. Differential thermal analyzing is used for measuring the phase transformation temperature beta t of a titanium alloy blank to be forged; under the temperature from (beta t+100) DEG C to (beta t+150) DEG C, heat preservation is carried out for 4 hours to 6 hours, and the blank to beforged is forged into a square blank; the obtained square blank is subject to heat preservation for 2 hours to 4 hours at the temperature from (beta t-20) DEG C to (beta t-10) DEG C, second-heating forging is carried out, the obtained square blank is subject to free drawing until the deformation amount reaches 50% to 60% of the total deformation amount, and the square blank obtained after free drawing is obtained; the obtained square blank obtained after free drawing rotates by 45 degrees around the center axis of the length direction of the square blank, pressing is carried out, and the final square blank is obtained; and the macrostructure of the cross section of the forge blank obtained after machining is uniform, the grain boundary is clear, no special-shaped piebald defects exist, the microstructure is uniform and consistent, the whole is of a net basket structure or equal-axis structure, and the edge and heart structures have no difference.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of thermal processing of titanium alloys, in particular to a forging method for improving the microstructure uniformity of titanium alloy forging blanks. [0003] 【Background technique】 [0004] Titanium alloys are prone to cracks due to high deformation resistance and narrow thermal processing temperature range, which increases the difficulty of manufacturing. Titanium alloy is one of the most difficult alloys to forge. The processing history and forging parameters of titanium alloy forging have a significant effect on its final microstructure and mechanical properties, and its influence may be greater than any other commonly used forging materials. . Therefore, in the forging of titanium alloys, it is not only necessary to establish a cost-effective forging shape, but also to combine it with heat treatment to establish a good and specific microstructure through deformation heat treatment to obtain expected ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21J1/06
CPCB21J1/06B21J5/008
Inventor 王海杨晓康崔文俊杨宏进祁函魏芬绒金旭丹
Owner 西安赛特思迈钛业有限公司