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A kind of preparation method of ultrafine grain pure iron gradient material

A gradient material and ultra-fine-grain technology, which is applied in the field of preparation of ultra-fine-grain pure iron gradient materials, can solve the problems that metal materials are difficult to achieve advanced design, and achieve the effects of easy promotion and application, simple equipment, and good economy

Active Publication Date: 2019-08-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In engineering applications, a large number of key metal components put forward corresponding special requirements for the mechanical properties of materials according to their different parts, so as to meet the specific working environment in which they are located. However, the mechanical properties of materials in the design of metal components are currently The performance is overall uniform, so it is difficult for conventional metal materials to meet the requirements of advanced design

Method used

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Examples

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Effect test

preparation example Construction

[0016] The invention discloses a method for preparing an ultrafine-grained pure iron gradient material, the steps of which are as follows:

[0017] 1) Processing pure iron billets and carbon steel cladding: Process pure iron into a cylindrical shape, and process Q235A carbon steel into a hollow cylindrical cladding. The height of the cylindrical pure iron is the same as that of the carbon steel cladding. The diameter of the inner hole of the sleeve is 0.5mm larger than that of cylindrical pure iron, and the outer diameter is 19.5mm larger than the inner diameter;

[0018] 2) Cryogenic treatment of pure iron: completely immerse the processed cylindrical pure iron in liquid nitrogen and keep it for 25-30min;

[0019] 3) Large load impact treatment: first place the carbon steel sleeve on the workbench, then quickly take out the pure iron in the liquid nitrogen and put it into the inner hole of the carbon steel sleeve, start the 2000kg air hammer to impact it at high speed , the ...

Embodiment 1

[0022] 1) Pure iron (original grain size 28μm) is processed into a cylindrical sample with a diameter of 100mm and a height of 100mm, and Q235A carbon steel is processed into a cylindrical jacket with an outer diameter of 120mm, an inner diameter of 100.5mm and a height of 100mm;

[0023] 2) The cylindrical pure iron processed in the first step is completely immersed in liquid nitrogen and kept for 30min;

[0024] 3) First place the carbon steel sleeve on the workbench, quickly take out the pure iron in the liquid nitrogen and put it into the inner hole of the carbon steel sleeve on the workbench, start the 2000kg air hammer to impact it at high speed, the number of times of impact is 1 times, the impact speed is 4.2m / s, and the primary deformation of the cylindrical carbon steel cladding and pure iron is controlled to be 80%;

[0025] 4) Remove the impact-treated sample from the workbench, remove the jacket after cooling to room temperature, and process a rectangular sample (...

Embodiment 2

[0028] 1) Pure iron (original grain size 28μm) is processed into a cylindrical sample with a diameter of 100mm and a height of 100mm, and Q235A carbon steel is processed into a cylindrical jacket with an outer diameter of 120mm, an inner diameter of 100.5mm and a height of 100mm;

[0029] 2) The cylindrical pure iron processed in the first step is completely immersed in liquid nitrogen and kept for 30min;

[0030]3) First place the carbon steel sleeve on the workbench, quickly take out the pure iron in the liquid nitrogen and put it into the inner hole of the carbon steel sleeve on the workbench, start the 2000kg air hammer to impact it at high speed, the number of times of impact is 1 times, the impact speed is 4.2m / s, and the primary deformation of the cylindrical carbon steel cladding and pure iron is controlled to be 75%;

[0031] 4) Remove the impact-treated sample from the workbench, remove the jacket after cooling to room temperature, and process the sample into a recta...

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Abstract

The invention belongs to the field of functional gradient materials and discloses a preparation method of an ultra-fine-grain pure-iron gradient material. According to the preparation method, common pure iron serves as a blank, the technological means that large-load impact under the liquid nitrogen temperature and linear gradient temperature field heat treatment are combined is adopted, and the ultra-fine-grain pure-iron gradient material is prepared. The technology is simple, operation is convenient and rapid, preparation micro-defects such as micro-pores and weak connection are avoided, thepreparation efficiency is high, the economical efficiency is good, and ultra-fine graining and gradient distribution of the material can be adjusted and controlled. The gradient materials which can be prepared through the method are diversified, and the preparation method is suitable for materials such as steel and titanium alloys which are of copper and carbon structures besides the pure iron.

Description

technical field [0001] The invention belongs to the field of gradient functional materials, and particularly provides a preparation method of ultrafine-grained pure iron gradient material. Background technique [0002] Functionally graded materials are a new type of non-uniform composite materials developed in the mid-to-late 1980s. By controlling the material composition and / or structure to change continuously or quasi-continuously from one side of the material to the other side, spatially The performance of the material presents a gradient change, so as to meet the special performance requirements of the corresponding parts of the component and achieve the purpose of optimizing the overall performance of the structure. The functional gradient material was originally proposed to solve the thermal protection coating problem of the space shuttle. Under the special use environment of the space shuttle, there is a huge temperature difference between the two sides of the materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D6/04C21D7/10
Inventor 罗伟严密楼圆周健吴琛
Owner ZHEJIANG UNIV
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