Hot isostatic pressing two-step forming method of high temperature alloy compact piece

A hot isostatic pressing and superalloy technology, applied in the field of advanced manufacturing, can solve the problems of inability to guarantee the dimensional accuracy and shape accuracy of formed parts, low yield strength of mild steel at high temperature, and the performance of parts cannot meet the requirements. The effect of good tissue performance and high shape accuracy

Active Publication Date: 2013-05-22
HUAZHONG UNIV OF SCI & TECH +1
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Problems solved by technology

The following basic principles must be followed in the selection of sheath material: (1) The sheath should have absolutely reliable airtightness; (2) It should not react with the pressed material; (3) It has appropriate strength and good plasticity; (4) It is easy to Processing and forming, easy to peel; (5) has good economic effectiveness. Based on these principles, the choice of wrapping materials is limited to a certain extent
[0008] At present, most of the hot isostatic pressing sheaths are made of mild steel, because mild steel has good processing performance, easy to remove after hot isostatic pressing, and the price is relatively cheap, but due to the low high temperature yield strength of mild steel, it is used as In the shape control

Method used

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  • Hot isostatic pressing two-step forming method of high temperature alloy compact piece
  • Hot isostatic pressing two-step forming method of high temperature alloy compact piece
  • Hot isostatic pressing two-step forming method of high temperature alloy compact piece

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example 1

[0039] This is to utilize the present invention to manufacture titanium alloy (Ti6A14V, TC4) blisk ( image 3 ) instance:

[0040] The process parameters of conventional hot isostatic pressing of titanium alloy are: temperature 950°C, pressure 120MPa. Under this temperature and pressure, the structure and performance of the parts are excellent, and the density is high. However, under this high temperature and high pressure, the deformation of the shape-controlling mold is very large, and the shape accuracy and dimensional accuracy of the final parts are often low.

[0041] Against this background, the above-mentioned problems can be solved by using the present invention. Specific steps are as follows:

[0042] (1) According to the design of the hot isostatic pressing of the parts, No. 20 steel is selected as the material of the jacket, and the shape-controlled core ( Figure 4 ) is manufactured by machining;

[0043] (2) Weld the sheath, and weld the mold shape control part ...

example 2

[0056] This is to utilize the present invention to make nickel base alloy (Ni625) long straight rod ( Figure 6 ) instance:

[0057] The process parameters of conventional hot isostatic pressing of nickel-based alloys are: temperature 1050°C, pressure 120MPa. When forming a long straight rod under this process, the yield strength of the shape-controlling mold material is very low, the deformation is large, and the dimensional accuracy of the formed part cannot be guaranteed. Moreover, this long straight structure also has the problem of being difficult to fill and compact.

[0058] Against this background, the above-mentioned problems can be solved by using the present invention. Specific steps are as follows:

[0059] (1) According to the design of the hot isostatic pressing of the parts, No. 20 steel is selected as the material of the jacket;

[0060] (2) Weld the sheath, and weld the mold shape control part and the upper and lower end caps into a whole to assemble a clos...

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Abstract

The invention belongs to the field of advanced manufacturing, and particularly relates to a hot isostatic pressing two-step forming method of a high temperature alloy compact piece. The method includes two steps of hot isostatic pressing, according to a first step of hot isostatic pressing, a formation control mold is controlled to deform at a low temperature or pressure, part pressed blanks high in precision of shapes and sizes are obtained, wrapping sleeve limitation does not exist in a second forming step, the temperature and the pressure which are most suitable for formation material are adopted, both holes left in the first step are eliminated, compactness is improved, and the precision of the shapes and the sizes is guaranteed, and good organizational performance under the most suitable temperature and the most suitable pressure is obtained. Due to the fact that the temperature and the pressure in the first forming step are low, material choosing problem of complicated formation control molds is solved, material which is difficult to process and high in high temperature yield strength is not required to be chosen as a formation control type mold core, and manufacture cost of the mold is reduced.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing, and in particular relates to a hot isostatic pressing two-step forming method for high-temperature alloy dense parts. technical background [0002] Some key components in the aerospace field are often processed from high-temperature alloys (nickel-based alloys, titanium-based alloys) and other difficult-to-machine materials. Conventional methods are used to process and form them. The process is difficult, the material is wasted, and the manufacturing cost is high. [0003] Nickel-based titanium-based superalloys are irreplaceable forming materials for aerospace high-temperature hot-end parts because of their good fracture toughness, fatigue resistance, hot corrosion resistance and good high-temperature strength. However, the complex alloying of superalloys leads to severe composition segregation, dispersion of mechanical properties, and deterioration of thermal process properties during cast...

Claims

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Application Information

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IPC IPC(8): B22F3/04
Inventor 史玉升薛鹏举吴言魏青松李伟闫春泽刘洁黄俊
Owner HUAZHONG UNIV OF SCI & TECH
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