Block nano structure low-carbon steel and manufacturing method thereof

A nanostructure and low-carbon steel technology, applied in the direction of nanotechnology, can solve the problems of complex preparation process of nanomaterials, limited material size, difficult internal pores, etc., to achieve easy control and mass production, high tensile strength and fatigue The effect of extreme, uniform internal structure

Active Publication Date: 2012-07-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Various methods for preparing nanomaterials are currently known, including physical vapor deposition, chemical vapor deposition, and amorphous crystallization. Most of them are difficult to achieve practical application in industry due to limited external dimensions and internal pores and other defects.
In particular, in the current state of the art, how to obtain a homogeneous nanostructure in larger bulk materials, especially bulk low carbon steels such as thickness or diameter above 5mm (i.e. equal to or greater than 5mm) and how to use The preparation of bulk nanostructured materials with low production costs still faces great challenges

Method used

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  • Block nano structure low-carbon steel and manufacturing method thereof
  • Block nano structure low-carbon steel and manufacturing method thereof
  • Block nano structure low-carbon steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Sample size φ22mm×35mm. Perform multiple deformation treatments at room temperature, each deformation strain is about 0.1-0.2, and the cumulative strain is about 1.73. The sample size after treatment is φ52.7mm×6.5mm. like figure 2 , image 3 As shown, SEM-ECC (Scanning Electron Microscope Electron Channel Contrast) and TEM (Transmission Electron Microscope) cross-sectional observations show that the microstructure is lamellar ferrite grains and deformed pearlite. Obviously, after the above treatment, the ferrite grains become lamellar, and high-density dislocations are distributed inside. The average size of the ferrite grains in the minor axis direction is 200 nm. from Figure 4 It can be seen from the engineering stress-strain curve that its tensile strength is 976MPa and its elongation at break is 4.0%. from Figure 5 As can be seen from the typical fatigue life curve shown, the 50% survival rate fatigue limit is 270MPa, where the stress concentration factor...

Embodiment 2

[0049] Sample size φ10mm×17mm. Multiple deformation treatments were carried out at room temperature, each deformation strain was about 0.23, and the cumulative strain was about 2.1. The sample size after treatment is φ31.2mm×2mm. SEM-ECC and TEM section observations show that the microstructure is lamellar ferrite grains and deformed pearlite. Hardness test shows that its average hardness is Vickers hardness HV271. A tensile test at room temperature shows that its tensile strength is 1014MPa, and its elongation at break is 3.8%.

Embodiment 3

[0051] The size of the sample is φ15mm×20mm, and it is subjected to multiple deformation treatments at room temperature. The strain of each deformation is about 0.1-0.2, and the cumulative strain is about 1.4. The sample size after treatment is φ33.2mm×5.0mm. SEM-ECC and TEM section observations show that the microstructure is lamellar ferrite grains and deformed pearlite. Hardness test shows that its average hardness is Vickers hardness HV264. Tensile test at room temperature showed that the tensile strength was 978MPa and the elongation at break was 5.5%.

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Abstract

The invention relates to a manufacturing method of block nano structure low-carbon steel, which comprises the following steps that a low-carbon steel block blank is prepared; the low-carbon steel block blank is impacted by a compression device so as to force the low-carbon steel block blank to be transformed according to a high strain rate normally in the range of 102-103 / s, and a microscopic structure of the low-carbon steel block blank becomes a nano structure, namely the block nano structure low-carbon steel is manufactured. Compared with traditional low-carbon steel, the block nano structure low-carbon steel manufactured by the method has high tensible strength and fatigue limit. The method can be implemented by using simple and convenient devices, is easy to control, and performs mass production by using economical production cost. The invention further relates to the block nano structure low-carbon steel manufactured by the method, and the block nano structure low-carbon steel is plates with the thickness more than 5mm or rods with the diameter more than 5mm preferentially.

Description

technical field [0001] The invention relates to a nanostructure preparation method of low-carbon steel and the nanostructure low-carbon steel prepared therefrom, in particular to a bulk nanostructure low-carbon steel and a preparation method thereof. Background technique [0002] In general, mild steel has low tensile strength and fatigue limit. Typically, the tensile strength and fatigue limit of low carbon steels can be improved in four ways: 1) alloying (i.e. solid solution strengthening or precipitation hardening); 2) phase transformation strengthening (such as martensitization); 3) The grains are refined to the order of microns by heat treatment, or the grains are refined to the order of submicrons by severe plastic deformation; 4) The grains are refined to the order of nanometers. [0003] The nanostructured low carbon steel prepared by the fourth way above exhibits excellent mechanical and physical properties, such as high tensile strength and fatigue limit, due to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06C21D8/00B82Y40/00
CPCB21D31/06C21D2211/009C21D8/00C21D2211/005C21D8/06B82Y40/00
Inventor 孙利昕陶乃镕卢柯昆茨·马修斯喻家庆
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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