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Method for changing structure uniformity of large-specification titanium alloy bar

A technology with uniform structure and large size, applied in the field of forging of large-size titanium alloy bars, can solve the problems of large deformation dead zone, small size of forged bars, and poor deformation uniformity, so as to achieve small deformation dead zone and improve the structure. The effect of uniformity

Active Publication Date: 2014-07-23
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0007] The purpose of this invention is to solve the problems of traditional square or hexagonal upsetting deformation with large dead zone, poor deformation uniformity, and small specification of forged bars.

Method used

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  • Method for changing structure uniformity of large-specification titanium alloy bar
  • Method for changing structure uniformity of large-specification titanium alloy bar

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Experimental program
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specific Embodiment approach

[0023] Cut Φ350mm large-scale titanium alloy bar with a length of 840mm.

[0024] The first fire: heating to 960°C, upsetting to about 500mm in thickness and about 400mm in height, and then drawing in an octagonal shape to about 350mm in thickness and about 840mm in height (along the fiber direction), and it will not round after drawing . Then continue to upsetting, upsetting to about 500mm in diameter and about 400mm in height, and then draw in an octagonal shape to about 350mm in diameter and about 840mm in height.

[0025] The second fire: heat the forged billet after the second upsetting to 960°C, and the phase transition point is 990°C, and perform the third upsetting to a roughness of about 500mm and a height of about 400mm, and then The octagon is elongated to a diameter of about 350 mm and a height of about 840 mm (along the fiber direction). Under this fire, repeat the fourth upsetting, upsetting to about 500mm in diameter and about 400mm in height, and then elongat...

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Abstract

The invention relates to a method for changing the structure uniformity of a large-specification titanium alloy bar. The method comprises the following steps: I, bar cutting and first-fire all-direction upsetting and stretching; II, second-fire all-direction upsetting and stretching; III, third-fire upsetting and stretching. Through three-fire six-time all-direction upsetting and stretching, an equiaxial uniform duplex microstructure with primary alpha phase (10-40%) plus beta transformation structure can be provided for a forged piece. The substituting forging technology does a good preparation for next-step blank production and die forging.

Description

technical field [0001] The invention belongs to the technical field of processing titanium alloy materials, and in particular relates to a large-scale titanium alloy bar reforging technology. Background technique [0002] With the increase of titanium alloy forgings, the bar specifications required for forgings are also increasing, and the control of the uniformity of microstructure and properties becomes the key to the microstructure and properties of forgings. Generally speaking, the two-state structure composed of primary α phase and β transformation structure is mainly determined by factors such as the deformation temperature and deformation amount of the forging. In order to obtain a dual-state structure with excellent comprehensive properties and uniformity, in addition to solving the problem of controlling the deformation temperature and deformation amount during the forging forming process, the most important structure preparation is in the process of forging blank p...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 张旺峰熊运森王玉会王卫红张庆玲
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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