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A Hot Isostatic Pressing Method for Forming Structures with Grain Size Continuously Varying

A grain size, hot isostatic pressing technology, applied in the field of static pressing, can solve problems such as inability to manufacture parts, and achieve the effect of eliminating the step effect, the change of performance is continuous and stable, and the operability and applicability are strong.

Active Publication Date: 2019-12-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current traditional hot isostatic pressing process is still unable to manufacture parts with the above special properties

Method used

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  • A Hot Isostatic Pressing Method for Forming Structures with Grain Size Continuously Varying
  • A Hot Isostatic Pressing Method for Forming Structures with Grain Size Continuously Varying
  • A Hot Isostatic Pressing Method for Forming Structures with Grain Size Continuously Varying

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] Schematic diagram of the process flow for preparing Ti alloy cylindrical parts with a continuously changing structure of grain size, which specifically includes the following steps:

[0037] (1) Obtain Ti alloy powder particles with different particle sizes by using plasmaization and other pulverization methods.

[0038] like Figure 1a As shown, during the milling process, the powder particle size usually has several characteristics of random distribution, normal distribution or lognormal distribution. Since powder particles 1 vary in size, their grain size 2 also varies. Usually, the powder with small particle size has fine grains due to fast cooling; while the large particle size has coarse grains due to slow cooling.

[0039] (2) According to the part model, design the three-dimensional CAD model of the bag and process it into shape.

[0040] The sheath usually consists of a cylinder body 9, an upper end cap 8, a lower end cap 10 and a core 11, wherein the upper a...

example 2

[0052] Schematic diagram of preparing a Ti alloy cylindrical part with a continuously changing grain size structure. The basic steps are the same as in Example 1, but the process is adjusted during the vibration application process to obtain a different grain size distribution structure. Specifically, the following steps are included:

[0053] (1) Obtain Ti alloy powder particles with different particle sizes by using plasmaization and other pulverization methods.

[0054] (2) According to the part model, use the 3D modeling software to design the 3D model of the bag and process and assemble it.

[0055] (3) Fill the sheath with random, normal or lognormal distribution of particle size powder, and apply high-frequency vibration to make the powder form particle size segregation and continuous layering in the sheath.

[0056] like Figure 2a As shown, in this example, specific segregation and stratification effects are obtained by adjusting the frequency, amplitude, phase, and ...

example 3

[0063] Schematic diagram of preparing Ni alloy casing parts with continuously changing structure of grain size. The basic steps are the same as in Example 1, but the specific wrapping structure of the casing parts is changed. In addition, the process is adjusted in the vibration application process, and different results are obtained. The grain size distribution structure specifically comprises the following steps:

[0064] (1) Obtain Ni alloy powder particles with different particle sizes by using plasmaization and other pulverizing methods.

[0065] (2) According to the model of the casing parts, the three-dimensional model of the casing is designed and assembled by using three-dimensional modeling software.

[0066] (3) Fill the sheath with random, normal or lognormal distribution of particle size powder, and apply high-frequency vibration to make the powder form particle size segregation and continuous layering in the sheath.

[0067] like Figure 3a As shown, in this ex...

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Abstract

The invention belongs to the field of hot isostatic pressing forming, and discloses a hot isostatic pressing forming method for forming structures with continuous grain size varying. The hot isostaticpressing forming method comprises the following steps that (a), powder particles with different particle sizes are selected and sheaths and cores are designed and formed according to a three-dimensional structure of a part to be formed; (b), the powder particles with the different particle sizes fill into the sheaths, and vibration is applied to the sheaths to obtain powder grain size distribution with the same demands as the grain size distribution; and (c), the sheaths are closed, heating, vacuum pumping and isostatic pressing treatment are performed in sequence, the forming process is completed in sequence, and the sheaths and the cores are removed to obtain required forming parts. According to the hot isostatic pressing forming method for forming the structures with continuous grain size varying, continuous change of the grain size of workpieces can be realized, so that different parts of the workpieces have continuous and variable mechanical properties, and the hot isostatic pressing forming method is especially suitable for manufacturing key parts with double-performance or multi-performance requirements in the aerospace field.

Description

technical field [0001] The invention belongs to the field of hot isostatic pressing, and more specifically relates to a hot isostatic pressing method for forming a structure with continuously changing grain size. Background technique [0002] Due to high performance requirements such as high temperature strength, thermal expansion, and thermal fatigue, parts such as turbine disks and casings of aero-engines are usually made of nickel alloys or titanium alloys. However, due to the high melting point and high strength of nickel-based and titanium-based alloy materials, it is difficult to process them by conventional methods such as turning, milling, planing, and grinding. Casting is prone to defects such as pores and coarse structures, which make the performance of parts unable to meet the special working environment of aerospace. Forging can process parts with higher performance, but it is difficult or even impossible to process parts with more complex structures. Hot isost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/15
CPCB22F3/15
Inventor 魏青松陈辉朱文志薛鹏举袁伟豪史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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