Modification method improving strength, plasticity and toughness of industrial pure iron simultaneously

An industrial pure iron and toughness technology, which is applied in the field of high strength, high plasticity and high impact toughness industrial pure iron and its preparation, can solve the problems of low production efficiency, complex and expensive equipment, plasticity and toughness reduction, and achieve high production efficiency , convenient operation, and the effect of improving strength

Active Publication Date: 2019-06-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the sample prepared by this method does not have the problems of microporosity and oxidation pollution, it has the disadvantages of complex and expensive equipment, low production efficiency, and difficulty in producing large-sized ultrafine crystal / nanocrystalline materials.
Moreover, due to the introduction of a large number of dislocations during the plastic deformation process, the internal defects of the sample increase, which is easy to cause a decrease in plasticity and toughness.
For example, foreign researchers found that the yield strength, maximum tensile strength and microhardness of the sample were significantly increased after a certain plastic deformation of the A1100 pure aluminum plate, but the elongation at break and toughness were significantly reduced.
Domestic scholars have found that after plastic deformation of 9Cr1Mo steel, although the grains are refined to ultra-fine grains, the elongation after fracture decreases significantly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

comparative example 1

[0021] 1) Industrial pure iron (the original grain is equiaxed, size 25μm) is a solid cylindrical sample with a diameter of 99.5mm and a height of 100mm, and the jacket material is a hollow cylinder of Q235B carbon structural steel, with an inner diameter of 100mm and an outer diameter of 120mm , height 100mm, industrial pure iron is completely immersed in liquid nitrogen and kept for 30min;

[0022] 2) Take out the industrial pure iron immediately after cooling and place it in the Q235B carbon structural steel ladle placed on the workbench, and use a 4000kg air hammer to perform one-way single-pass high-speed impact on the two at the same time, and the impact speed is 7.35m / s , and finally obtain high distortion industrial pure iron with a strain of 0.50;

[0023] 3) After the impact treatment material is removed from the sheath, it is processed into a tensile specimen and a Charpy V-notch standard impact specimen according to national standards;

[0024] 4) Carry out mechan...

comparative example 2

[0026] 1) Industrial pure iron (the original grain is equiaxed, size 25μm) is a solid cylindrical sample with a diameter of 99.5mm and a height of 100mm, and the jacket material is a hollow cylinder of Q235B carbon structural steel, with an inner diameter of 100mm and an outer diameter of 120mm , height 100mm, industrial pure iron is completely immersed in liquid nitrogen and kept for 30min;

[0027] 2) Take out the industrial pure iron immediately after cooling and place it in the Q235B carbon structural steel ladle placed on the workbench, and use a 4000kg air hammer to perform one-way single-pass high-speed impact on the two at the same time, and the impact speed is 7.35m / s , and finally obtain high distortion industrial pure iron with a strain of 0.50;

[0028] 3) After the impact treatment material is removed from the sheath, it is processed into tensile samples and Charpy V-notch standard impact samples according to national standards, and put into a uniform temperature ...

comparative example 3

[0031] 1) Industrial pure iron (primary grain is equiaxed, size 25μm) is a solid cylindrical sample with a diameter of 99.5mm and a height of 100mm, and the jacket material is a hollow cylinder of Q235B carbon structural steel, with an inner diameter of 100mm and an outer diameter of 120mm , height 100mm, industrial pure iron is completely immersed in liquid nitrogen and kept for 30min;

[0032] 2) Immediately take out the industrial pure iron after cooling and put it into the Q235B carbon structural steel ladle placed on the workbench. A 4000kg air hammer is used to perform one-way single-pass high-speed impact on the two at the same time, and the impact speed is 7.35m / s. , and finally obtained high distortion industrial pure iron with a strain of 0.45;

[0033] 3) After the impact treatment material is removed from the sheath, it is processed into tensile samples and Charpy V-notch standard impact samples according to national standards, and put into a heat treatment furnace...

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Abstract

The invention discloses a Modification method improving strength, plasticity and toughness of industrial pure iron simultaneously. According to the method, common industrial pure iron is taken as a blank, the structure is refined through the technical means of combining cryogenic high-load impact and homogeneous field heat treatment, and the strength, plasticity and impact toughness of the material are greatly improved. The method is simple in preparation flow, convenient and rapid to operate, high in economical efficiency, and free from the microdefects of micropores, weak connection and thelike.

Description

technical field [0001] The invention relates to an industrial pure iron metal material, in particular to an industrial pure iron with high strength, high plasticity and high impact toughness and a preparation method thereof. Background technique [0002] As a traditional metal material, iron and steel materials are used in fields such as bridge construction, automobiles, and aerospace. Due to the different requirements of different application scenarios, the properties of materials are generally changed through cold and hot processing, alloy addition, and heat treatment. Industrial pure iron is a kind of steel material, the main chemical composition is iron, the total impurity content is less than 0.2%, and the carbon content is 0.02% to 0.04%. Because of its physical properties such as less impurity elements and excellent electrical conductivity, it is widely used Used in automobiles, electronic appliances, relays and other fields. However, the strength of industrial pure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/04C21D10/00C21D1/26
Inventor 罗伟楼圆严密周健吴琛
Owner ZHEJIANG UNIV
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