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Free forging method capable of controlling structure uniformity of titanium alloys

A technology with uniform structure and titanium alloy, applied in the field of metal plastic processing, can solve the problems of high intermediate loss, long process path and high processing cost, and achieve the effect of reducing intermediate consumption, reducing production cost and uniform structure of titanium alloy forgings

Active Publication Date: 2021-11-02
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a free forging method with uniform control of titanium alloy structure, which can effectively prevent the deterioration of the structure in the core area of ​​the titanium alloy forging billet, and obtain a uniform cross-sectional structure of the forging material, which solves the problem of obtaining the titanium alloy structure in the existing forging process. Uniformity, long process path, high intermediate loss and high processing cost caused by multi-fire forging

Method used

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  • Free forging method capable of controlling structure uniformity of titanium alloys
  • Free forging method capable of controlling structure uniformity of titanium alloys
  • Free forging method capable of controlling structure uniformity of titanium alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The free forging method of forging a rod-shaped forging material with a square cross-section from a TC4 rod-shaped titanium alloy forging billet with a circular cross-section comprises the following steps:

[0038] 1) preheating

[0039] Preheat the furnace to 950°C;

[0040] 2) heat treatment

[0041] Put the TC4 titanium alloy forging blank with a section diameter of 500mm and a length of 600mm into the preheated heating furnace for 198min;

[0042] 3) Pull out

[0043] Transfer the TC4 titanium alloy forging billet to a hydraulic press with an anvil width of 600mm, and stretch it along the length direction of the forging billet, then rotate the forging billet 90° around the axial direction, and then stretch it along the length direction of the forging billet; wherein, each hammer The amount of billet feeding is 300mm, and the reduction of each hammer is 10%;

[0044] 4) Molding

[0045] Repeat the drawing operation to obtain a rod-shaped forging material with a ...

Embodiment 2

[0050] The free forging method for forging a rod-shaped forging material with an octagonal cross-section from a TC4 rod-shaped titanium alloy forging billet with a square cross-section comprises the following steps:

[0051] 1) preheating

[0052] Preheat the furnace to 960°C;

[0053] 2) heat treatment

[0054] Put the TC4 titanium alloy forging blank with a cross section of 350×350mm and a length of 600mm into the preheated heating furnace for 150min;

[0055] 3) Pull out

[0056] Transfer the TC4 titanium alloy forging billet to a hydraulic press with an anvil width of 600mm, and stretch it along the length direction of the forging billet, then rotate the forging billet around the axial direction, and then stretch it along the length direction of the forging billet; wherein, each hammer enters the billet The amount is 250mm, and the reduction of each hammer is 8%;

[0057] 4) Molding

[0058] Repeated drawing to obtain an octagonal rod-shaped forging material with a cr...

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Abstract

The invention discloses a free forging method capable of controlling structure uniformity of titanium alloys. The free forging method comprises the following steps: (1), preheating; (2), carrying out heat treatment by placing a titanium alloy forging stock at the room temperature into a preheated heating furnace for heat preservation, wherein the heat preservation time is D / 3+(30-50) minutes, D is the diameter of the cross section or the diameter of the inscribed circle of the forging stock, and the unit is mm; (3), drawing; and (4), forming by controlling the heat treatment time, enabling the temperature distribution characteristic on the section of the titanium alloy forging stock to be high in edge temperature and low in center temperature. On the one hand, the temperature of the center area of the forging stock in the forging process can be controlled below a phase transformation point so as to prevent the structure of the center area from becoming poor; and on the other hand, uniform metal flow can be generated on the cross section of the forging stock in the forging process, so that the cross section structure of the obtained forging material is more uniform. According to the method, a result as same as that of multi-heating-number forging is obtained under the condition that the forging heating number is reduced; the process route is effectively shortened; intermediate consumption is reduced; and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of metal plastic processing, in particular to a free forging method for uniformly controlling the microstructure of a titanium alloy. Background technique [0002] In addition to depending on the composition, the performance of titanium alloys is also very dependent on the structure. Due to the limitation of material properties, titanium alloys are usually produced into forging blanks by forging, and then the forged blanks are further processed into rods, wires, wires, plates, pipes and forgings according to the product form. Therefore, the structure of the forging billet has an important influence on the final material properties, especially for duplex titanium alloys, such as TC4, TC18, etc., whose final properties depend on the material's structure state and structure uniformity. [0003] At present, the method of forging titanium alloys is mainly air hammer free forging or hydraulic press fast forging. ...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21J1/06C22F1/18
CPCB21J5/00B21J1/06C22F1/183
Inventor 范永革丁晨朱峰许正芳
Owner 宝武特种冶金有限公司