Superplastic creep aging forming method for tial-based alloy blade blanks

A creep age forming, base alloy technology, applied in metal processing equipment and other directions, can solve the problems of narrow processing window, difficult to form complex structural components, large deformation resistance and other problems, achieve large deformation resistance, reduce forming resistance and forming temperature, The effect of reducing the deformation temperature and deformation resistance

CN108580770BActive Publication Date: 2019-12-27重庆两航金属材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-12-27

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Abstract

The invention discloses a super-plastic creep age forming method of a TiAl-based alloy blade blank. Through the super-plastic creep age forming method, the super-plastic forming blade blank of a finegrain TiAl-based alloy is utilized, and the microstructure of the blank is adjusted and controlled. According to a process, under the low temperature and strain rate, isothermal forging forming is carried out on the forged-stage fine grain TiAl-based alloy, and meanwhile aging heat treatment is carried out to achieve structure control. According to the method, isothermal die forging and aging heattreatment are combined, the forming efficiency and forming quality of the TiAl-based alloy blade blank can be effectively improved, shape control and character control over a fine grain TiAl-based alloy blade blank component are achieved, orientation of grains approaches random distribution, beta phase and alpha 2 phase evolution is sufficient, and distribution is more uniform.
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Description

technical field

[0001] The invention relates to the field of plastic forming and heat treatment of TiAl-based alloys, in particular to a method for superplastic creep aging forming of TiAl-based alloy blade blanks. Background technique

[0002] TiAl-based alloy has the advantages of low density, high specific strength, high specific stiffness, and high creep resistance. It is an important candidate material for weight reduction in the upper limit of the service temperature of high-temperature titanium alloys and the lower limit of the service temperature of high-temperature alloys. In the field of aerospace Great application potential. However, due to the intrinsic brittleness of TiAl-based alloys, its high deformation resistance and narrow processing window, it is difficult to form by ordinary forging. Isothermal forging is a suitable forming method for TiAl-based alloys, which can realize the processing of the blank to the near-final size in one or a few passes, and reduc...

Examples

Embodiment 1

[0027] This embodiment is a superplastic creep aging forming method for a TiAl-based alloy blade blank, and the specific process is:

[0028] Step 1, preform preparation: use wire cutting to cut the fine-grained bar to obtain a Φ20×80mm bar, upset and deform one end of the bar on the isothermal press, and put the bar and the mold into the isothermal press In the furnace chamber, the temperature of the furnace chamber of the press was raised to 1100°C at a heating rate of 30°C / min and kept for 60 minutes. After the heat preservation is over, the pressure head of the press drives the upper mold of the mold at a strain rate of 10 -3 the s -1 Press down 35mm, one end of the billet is deformed, and the shape of the preform of the blade is as attached figure 2 shown.

[0029] Step 2, pre-shaping of blade blank.

[0030] The method of superplastic isothermal die forging is used to realize the preforming of blade blank.

[0031] Put the blade preform and combined mold into the c...

Embodiment 2

[0037] This embodiment is a superplastic creep aging forming method for a TiAl-based alloy blade blank, and the specific process is:

[0038] Step 1, preform preparation: use wire cutting to cut the fine-grained bar to obtain a Φ20×80mm bar, upset and deform one end of the bar on the isothermal press, and put the bar and the mold into the isothermal press In the furnace chamber, the temperature of the furnace chamber of the press was raised to 1100°C at a heating rate of 30°C / min and kept for 60 minutes. After the heat preservation is over, the pressure head of the press drives the upper mold of the mold at a strain rate of 10 -3 the s -1 Press down 35mm, one end of the billet is deformed, and the shape of the preform of the blade is as attached figure 2 shown.

[0039] Step 2, pre-shaping of blade blank.

[0040] The method of superplastic isothermal die forging is used to realize the preforming of blade blank.

[0041] Put the blade preform and combined mold into the f...

Embodiment 3

[0046] This embodiment is a superplastic creep aging forming method for a TiAl-based alloy blade blank, and the specific process is:

[0047] Step 1, preform preparation: use wire cutting to cut the fine-grained bar to obtain a Φ20×80mm bar, upset and deform one end of the bar on the isothermal press, and put the bar and the mold into the isothermal press In the furnace chamber, the temperature of the furnace chamber of the press was raised to 1100°C at a heating rate of 30°C / min and kept for 60 minutes. After the heat preservation is over, the pressure head of the press drives the upper mold of the mold at a strain rate of 10 -3 the s -1 Press down 35mm, one end of the billet is deformed, and the shape of the preform of the blade is as attached figure 2 shown.

[0048] Step 2, pre-shaping of blade blank.

[0049] The method of superplastic isothermal die forging is used to realize the preforming of blade blank.

[0050] Put the blade preform and combined mold into the f...