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Forging method capable of improving structure uniformity of titanium alloy forging stock

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” defects in the cross-section of forging blanks, etc., to achieve uniform high-magnification structure, clear grain boundaries, and increase forging cost effect

Active Publication Date: 2018-05-22
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

[0004] The purpose of the present invention is to provide a forging method to improve the uniformity of the titanium alloy forging billet structure, so as to solve the problems of low-magnification "fork-shaped" defects and high-magnification structure inhomogeneity in the cross-section of the forging billet caused by the traditional forging method

Method used

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  • Forging method capable of improving structure uniformity of titanium alloy forging stock
  • Forging method capable of improving structure uniformity of titanium alloy forging stock
  • Forging method capable of improving structure uniformity of titanium alloy forging stock

Examples

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Embodiment 1

[0032] 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; □170~□190mm square billet (that is, a square billet with a cross-sectional side length of 170mm-190mm); the square billet is forged with secondary fire, the forging temperature is 997~1007℃, and it is forged to □140 by four-sided forging ~□150mm; rotate the billet at an angle of 45°, start from the original four corners and divide it into two pressings, one pressing down to an approximate regular octagon, the second pressing down to □100~□105mm, the final forging temperature It is 890±5℃. TC20 titanium alloy □100 low-magnification structure after forging of the present invention such as image 3 As shown, the cross-sectional structure is uniform, the grains are clear, and there is no "fork" defect.

Embodiment 2

[0033] 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; □190~□210mm square forging billet; carry out secondary forging on the square billet, the forging temperature is 951~961℃, and use four-sided forging to forge to □150~□160mm; rotate the billet at 45° angle, from the original The four corners begin to elongate and are pressed twice, one press down to approximately a regular octagon, the second press down to □115~□120mm, and the final forging temperature is 870±5℃. The TC4 titanium alloy □120 microstructure after forging of the present invention is as follows Figure 4 (edge) and Figure 5 As shown in (heart), they are all basket tissues, and the edge and heart tissues are uniform.

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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

【Technical field】 [0001] 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. 【Background technique】 [0002] 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 mechanical prop...

Claims

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Application Information

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Patent Type & Authority Applications(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
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