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Cogging and forging method of TiAl alloy

A billet forging and alloying technology, which is applied in the field of TiAl alloy billet forging, can solve the problems of double bulging of forging cakes, short heat preservation time between passes, and insufficient use of billet forging, so as to achieve cost saving and uniform structure Good results

Active Publication Date: 2018-04-24
重庆两航金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because in the forging process, there is a forging process along the length of the ingot, which limits the height-to-diameter ratio of the original ingot h:d≤2:1. If the height-to-diameter ratio exceeds 2:1, the forged cake There will be a phenomenon of "double drumming", and the current research shows that the heat preservation time between passes is short, and the effect of heat preservation between passes on blank forging is not fully utilized.

Method used

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  • Cogging and forging method of TiAl alloy
  • Cogging and forging method of TiAl alloy

Examples

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Embodiment 1

[0027] This embodiment is a method for billet forging of TiAl alloy.

[0028] The TiAl alloy described in this embodiment is a TNM alloy, its nominal composition is Ti-43.5Al-4Nb-1Mo-0.2B, the composition is atomic percentage, and the size of the ingot used is Φ50×120 mm.

[0029] The specific process described in this embodiment is as follows:

[0030] The first step is preparation before forging. The preparation before forging includes preparing an ingot and wrapping the ingot.

[0031] Process an ingot with a size of Φ50×120mm from the ingot after hot isostatic pressing to ensure that the surface quality of the ingot is good and free of defects. The ingot is covered, and there is a gap of 3mm between the assembled ingot and the covering, which is used to fill the insulation cotton; the material of the covering is stainless steel, and the thickness is 10mm. After filling the 3mm gap between the sheath and the ingot with thermal insulation cotton, the sheath is connected by ...

Embodiment 2

[0043] This embodiment is a method for billet forging of TiAl alloy.

[0044] The nominal composition of the TiAl alloy described in this embodiment is Ti-43.5Al-4Nb-1Mo-0.2B, the composition is atomic percentage, and the size of the ingot used is Φ50×120 mm.

[0045] The specific process described in this embodiment is as follows:

[0046] The first step is preparation before forging. The preparation before forging includes preparing an ingot and wrapping the ingot.

[0047] Process an ingot with a size of Φ50×120mm from the ingot after hot isostatic pressing to ensure that the surface quality of the ingot is good and free of defects. The ingot is covered, and there is a gap of 3mm between the assembled ingot and the covering, which is used to fill the insulation cotton; the material of the covering is stainless steel, and the thickness is 10mm. After filling the 3mm gap between the sheath and the ingot with thermal insulation cotton, the sheath is connected by argon arc w...

Embodiment 3

[0061] This embodiment is a method for billet forging of TiAl alloy.

[0062] The nominal composition of the TiAl alloy described in this implementation example is Ti-48Al-2Nb-2Cr, the composition is atomic percentage, and the size of the ingot used is Φ50×120mm.

[0063] The specific process described in this embodiment is as follows:

[0064] The first step is preparation before forging. The preparation before forging includes preparing an ingot and wrapping the ingot.

[0065] Process an ingot with a size of Φ50×120mm from the ingot after hot isostatic pressing to ensure that the surface quality of the ingot is good and free of defects. The ingot is covered, and there is a gap of 3mm between the assembled ingot and the covering, which is used to fill the insulation cotton; the material of the covering is stainless steel, and the thickness is 10mm. After filling the 3mm gap between the sheath and the ingot with thermal insulation cotton, the sheath is connected by argon a...

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Abstract

The invention discloses a cogging and forging method of a TiAl alloy. Lamellas in an original structure are subjected to crushing and balling by controlling technological parameters of the deformationtemperature, the pressing machine screwdown rate, the deformation and the like. Meanwhile a phenomenon of meta-dynamic recrystallization occurring in the post-forging heat preservation process is sufficiently utilized, a forged disc is subjected to heat preservation after forging is conducted, energy stored by the forged disc in the forging process is sufficiently transformed into driving force needed by the structure in the meta-dynamic recrystallization process, so that the structure uniformity is good, and the forged disc with the structure being even and fine is obtained. According to thecogging and forging method of the TiAl alloy, when a height-diameter ratio (h:d) of a cast ingot is larger than (2:1), a double bulging phenomenon cannot happen compared with a traditional method that cogging and forging are conducted in the axial direction of the cast ingot, therefore the height-diameter ratio (h:d) of the cast ingot cannot be limited to be smaller than or equal to (2:1), cogging and forging can be conducted on TiAl alloy cast ingots with various height-diameter ratios, and therefore the cogging and forging cost is saved.

Description

technical field [0001] The invention relates to the field of intermetallic compound forging, in particular to a TiAl alloy blank forging method. Background technique [0002] With the rapid development of the aerospace field, higher requirements are put forward for the materials used in the aerospace field. Therefore, metal materials with the characteristics of light weight, high temperature resistance and good mechanical properties have become an important development direction. As an intermetallic compound alloy, the service temperature of TiAl alloy can reach 700-850°C, and it has the characteristics of low density, high specific strength, good high temperature oxidation resistance and creep resistance, and is considered to be extremely applicable. Potential lightweight high-temperature structural metallic materials. [0003] As an important process for alloy ingot billet forging, the forging process can eliminate ingot defects (such as shrinkage cavity, shrinkage porosi...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21J1/06B21K29/00C22F1/18
CPCB21J1/06B21J5/002B21K29/00C22F1/183
Inventor 唐斌向林李金山薛祥义寇宏超王军孙智刚
Owner 重庆两航金属材料有限公司
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