A Modification Method Simultaneously Improving the Strength, Plasticity and Toughness of Industrial Pure Iron

A technology of industrial pure iron and toughness, 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, reduced plasticity, toughness, complicated and expensive equipment, etc., and achieve high production efficiency , the effect of improving strength and simple process

Active Publication Date: 2020-04-10
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 crystal grain is equiaxed, the size is 25μm) is a solid cylindrical sample with a diameter of 99.5mm and a height of 100mm. 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) After the industrial pure iron is cooled, immediately take it out and put it into the Q235B carbon structural steel cladding placed on the workbench. Use a 4000kg air hammer to simultaneously perform unidirectional single-pass high-speed impact on both at the impact speed of 7.35m / s , And finally get 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 tensile specimens and Charpy V-notch standard impact specimens in accordance with national standards;

[0024] 4) The m...

comparative example 2

[0026] 1) Industrial pure iron (the original crystal grain is equiaxed, the size is 25μm) is a solid cylindrical sample with a diameter of 99.5mm and a height of 100mm. 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) After the industrial pure iron is cooled, immediately take it out and put it into the Q235B carbon structural steel cladding placed on the workbench. Use a 4000kg air hammer to simultaneously perform unidirectional single-pass high-speed impact on both at the impact speed of 7.35m / s , And finally get high distortion industrial pure iron with a strain of 0.50;

[0028] 3) After the impact treatment material is removed from the jacket, it is processed into tensile specimens and Charpy V-notch standard impact specimens in accordance with national standards, and placed in a ...

comparative example 3

[0031] 1) Industrial pure iron (the original crystal grain is equiaxed, the size is 25μm) is a solid cylindrical sample with a diameter of 99.5mm and a height of 100mm. 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) After the industrial pure iron is cooled, immediately take it out and put it into the Q235B carbon structural steel cladding placed on the workbench. Use a 4000kg air hammer to simultaneously perform unidirectional single-pass high-speed impact on both at the impact speed of 7.35m / s , And finally get 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 specimens and Charpy V-notch standard impact specimens in accordance with national standards, and placed in a ...

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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, steel materials are used in fields such as bridge construction, automobiles, aerospace, etc. Due to the different requirements of different application scenarios, the material properties are generally changed through processes such as cold and hot processing, alloy addition, and heat treatment. Industrial pure iron is a kind of steel material, the main chemical component 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 i...

Claims

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Application Information

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Patent Type & Authority Patents(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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