Hot-isostatic-pressing forming method for in-situ generation of continuous spatial net structure

A technology of hot isostatic pressing and in-situ reaction, which is applied in the field of advanced manufacturing and manufacturing aerospace, can solve problems such as difficult to meet performance requirements, achieve strong operability and applicability, and improve the effect of tensile strength

Inactive Publication Date: 2017-01-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it is difficult to meet the performance requirements of modern aerospa...

Method used

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  • Hot-isostatic-pressing forming method for in-situ generation of continuous spatial net structure
  • Hot-isostatic-pressing forming method for in-situ generation of continuous spatial net structure
  • Hot-isostatic-pressing forming method for in-situ generation of continuous spatial net structure

Examples

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example 1

[0037] This is an example for using the present invention to manufacture enhanced Ti6Al4V casing part wear resistance and tensile strength:

[0038] Ti6Al4V is a near-alpha titanium alloy, which is widely used in aerospace due to its ultra-high specific strength and excellent corrosion resistance, but its low wear resistance directly restricts its application range. In order to solve the defect of poor wear resistance of Ti6Al4V matrix material, this example chooses TiB 2 As a coating material, under the action of hot isostatic pressing at high temperature and high pressure, Ti and B will react in situ to form TiB and TiB 2 , TiB will grow into the adjacent powder during the generation process, enhancing the metallurgical bonding between powder and powder, thereby enhancing the tensile strength of the matrix; TiB 2 It is a ceramic material with high hardness, which can increase the hardness of the matrix material, thereby improving the wear resistance of the matrix material; ...

example 2

[0050] Using the present invention to manufacture enhanced plasticity and hardness of Ti6Al4V cylindrical parts is an example. Titanium alloys with cylindrical structures have typical engineering applications, such as missile casings, compressor casings in engines, and ship piping systems. Such key components usually have harsh working environments, and higher plasticity and hardness requirements are put forward for titanium alloy materials. To solve the above problems, the present invention uses Ti6Al4V as the matrix powder material and Ni as the reinforcing material. Under high pressure, Ti in the matrix will react with Ni atoms in situ to form TiNi, TiNi 2 , where TiNi belongs to the memory alloy, has super plasticity, TiNi 2 It has high hardness, and the two are dispersed in the matrix material at the same time, which improves the plasticity of the matrix material and improves the hardness.

[0051] In this context, using the present invention to manufacture Ti6Al4V cylin...

example 3

[0061] Using the present invention to manufacture enhanced Ni718 turbine disc parts plasticity and strength is an example. More than 50% of the mass of modern gas turbine engines use superalloys, and the amount of nickel-based superalloys accounts for about 40% of the engine materials. Because nickel-based alloys have excellent comprehensive properties at medium and high temperatures and are suitable for working at high temperatures for a long time, nickel-based superalloys are often used as materials for engine hot-end parts (blades, turbine disks, combustion chambers, etc.). Because of its high service temperature, higher requirements are put forward for the high-temperature performance of nickel-based alloy materials. In view of the above problems, the present invention uses Ni718 as the matrix powder material and Ti as the reinforcing material to improve the high-temperature strength and wear resistance of the matrix material. performance, under the action of high temperat...

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Abstract

The invention discloses a hot-isostatic-pressing forming method for in-situ generation of a continuous spatial net structure. According to the hot-isostatic-pressure forming method for in-situ generation of the continuous spatial net structure, the surface of a powder base material is covered with a layer of reinforcing materials before hot-isostatic pressing according to the reinforcing requirement of the base material during actual application, and the base material and the reinforcing material are subjected to an in-situ reaction under the effect of high temperature and high pressure of hot-isostatic pressing, so that a new compound with a reinforcing effect is generated, and the compound exists on the boundary of an original powder particle in the form of the continuous spatial net structure. Metallurgical defects caused by an oxide layer on the surface of the original powder particle are effectively reduced through the spatial net structure, and the metallurgical bonding strength between different kinds of powder is improved; and in addition, through a newly-generated reinforcing phase, relevant performance of the base material can be improved, the service life of a hot-isostatic-pressed workpiece is prolonged, and the safety of the hot-isostatic-pressed workpiece is improved.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing, and specifically relates to a hot isostatic pressing forming method. The method adopts the reinforcement phase generated in situ by hot isostatic pressing to strengthen the matrix material in the form of a continuous space network structure, and is especially suitable for manufacturing aerospace fields. Key components with complex structures and high performance requirements. Background technique [0002] Nickel-based and titanium-based alloys are widely used in the aerospace field because of their good comprehensive properties. Nickel-based alloys have the characteristics of good thermal fatigue resistance, low thermal expansion coefficient, and high elastic modulus, and are widely used in hot-end parts such as aerospace engines and industrial gas turbine turbines; titanium alloys have high specific strength, high thermal strength and high durability. Strength, low crack growth sensitivity...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C14/00
Inventor 宋波蔡超薛鹏举史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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