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Powder metallurgy material for endophytic oxide strengthening alloy and preparation method thereof

A powder metallurgy and strengthening alloy technology, applied in the field of powder metallurgy materials, can solve the problems of poor performance, limited doping amount, poor bonding and other problems of composite materials, and achieve the effect of low cost, uniform distribution and high efficiency

Pending Publication Date: 2020-05-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems in the existing powder metallurgy materials in the prior art, such as poor bonding between the second phase and the matrix, limited doping amount, and easy segregation when the size of the second phase is small, resulting in poor performance of the composite material, providing A kind of powder metallurgy material of endogenous oxide strengthened alloy and preparation method thereof

Method used

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  • Powder metallurgy material for endophytic oxide strengthening alloy and preparation method thereof
  • Powder metallurgy material for endophytic oxide strengthening alloy and preparation method thereof
  • Powder metallurgy material for endophytic oxide strengthening alloy and preparation method thereof

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preparation example Construction

[0022] A method for preparing powder metallurgy materials of endogenous oxide-strengthened alloys, comprising the following steps:

[0023] 1) Self-made or purchased initial alloy powder with particle size between 20-100 μm;

[0024] 2) cold-pressing the alloy powder in step 1) in a cold-pressing die at a pressure of 400-700 MPa to form a preform;

[0025] 3) The preform obtained in step (2) is placed in a sintering furnace, and in N 2 +(2-5vol.%)O 2 Carry out pressureless pre-sintering in the atmosphere, determine the appropriate pre-sintering temperature and forging temperature according to the "MPIF Standard 35-2012" standard, sinter under vacuum conditions for 20-480 minutes, and then put the pre-sintered parts into the hot forging die Hot forging is performed at the hot forging temperature in the cavity. After forging, the surface oxide layer is removed by shot peening, and the structural allowance is removed by machining and finishing to obtain powder forgings;

[002...

Embodiment 1

[0029] This embodiment 1 provides a kind of Fe 40 Mn 40 Co 10 Cr 10 Powder metallurgy material, self-made Fe 40 Mn 40 Co 10 Cr 10 Alloy powder, its particle size is 40 μm; the above alloy powder is placed in a cold pressing mold for cold pressing, and the pressure is 700 MPa to form a preform; the obtained preform is placed in a sintering furnace, in N 2 +2vol.%O 2 Pressureless pre-sintering is carried out in the atmosphere, that is, sintered at 1150 °C for 240 minutes under vacuum conditions and pre-oxidized, and then the pre-sintered parts are placed in the hot forging die cavity for hot forging at 1100 °C, and shot blasting is removed after forging. The surface oxide layer is machined and finished to remove the structural allowance to obtain powder forgings; the powder forgings are hot-rolled at 1000 ℃ to obtain Fe 40 Mn 40 Co 10 Cr 10 Powder metallurgy materials.

Embodiment 2

[0031] This embodiment 2 provides a kind of Fe 40 Mn 40 Co 10 Cr 10 Powder metallurgy materials, purchase Fe 40 Mn 40 Co 10 Cr 10 Alloy powder, its particle size is 100μm; the above alloy powder is placed in a cold pressing mold for cold pressing, and the pressure is 400MPa to form a preform; the obtained preform is placed in a sintering furnace, in N 2 +5vol.%O 2 Pressureless pre-sintering is carried out in the atmosphere, that is, sintered at 1150 °C for 20 minutes under vacuum conditions and pre-oxidized, and then the pre-sintered parts are placed in the hot forging die cavity for hot forging at 1100 °C, and shot blasting is removed after forging. The surface oxide layer is machined and trimmed to remove the structural allowance to obtain powder forgings; the powder forgings are forged at 1000 ℃ to obtain Fe 40 Mn 40 Co 10 Cr 10 Powder metallurgy materials.

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Abstract

The invention discloses a powder metallurgy material for an endophytic oxide strengthening alloy and a preparation method of the powder metallurgy material. The oxide strengthening alloy is directly prepared by utilizing the crushing effect of a powder forging process on an oxide film. Oxide is refined to be combined with a matrix at a crushing position of the oxide film, oxidation products are transferred into crystalline grain and are evenly distributed, the oxide film is well combined with the matrix, and an alloy material is further densified through thermal processing, and the prepared alloy has excellent properties such as high strength and good plasticity. The method requires no extra alloy element, and therefore the cost is low. Pre-oxidation treatment can be carried out on a largebatch of products at the same time without being limited by the load output capability of traditional vacuum hot-pressing sintering. The production process is simple. Requirements for production environment are low. The formed oxide is well combined with the matrix. Large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the field of powder metallurgy materials, and relates to a powder metallurgy material of an endogenous oxide reinforced alloy and a preparation method thereof. Background technique [0002] Second-phase strengthening is a main method used to strengthen materials. According to the way the second phase is generated, it can be divided into two types: external second phase and endogenous second phase. Generally, due to the difficulty of achieving good metallurgical bonding with the matrix by the addition of the second phase and the limited amount of addition, the strengthening effect of the powder metallurgy material composite prepared by this addition method is often lower than that of the endogenous second phase. Therefore, how to prepare The endogenous second phase strengthened alloys with fine and dispersed distribution have great research value. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to so...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C30/00B22F3/17B22F3/10
CPCC22C1/056C22C30/00B22F3/1007B22F3/17B22F2003/175
Inventor 江峰曹庭辉吴亚科王邃孙军
Owner XI AN JIAOTONG UNIV
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