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Method for toughening iron and steel materials by adding nano-particles

A steel material, nanoparticle technology

Inactive Publication Date: 2011-02-09
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for the plasticization control of inclusions, there are relatively mature methods in individual steel types (such as hard wire steel), but there is still no good method for how to refine the size of inclusions, which has become the current development The bottleneck of high-performance steel materials

Method used

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  • Method for toughening iron and steel materials by adding nano-particles
  • Method for toughening iron and steel materials by adding nano-particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) First, the nano Al 2 O 3 Put the powder into a container, add absolute ethanol, and then put it into an ultrasonic cleaning machine for ultrasonic dispersion. After the dispersion is completed, the ethanol is completely volatilized;

[0021] (2) Mix the ultrasonically dispersed nano-powder with the auxiliary material (high-purity iron powder) that does not pollute the molten steel at a mass ratio of 1:8, and then mix it with a ball mill for a long time (≥48h);

[0022] (3) Press the mixed powder uniformly mixed in step (2) into square nano additive particles with a powder molding machine, and the side length of the square (indicated by a) ranges from 10mm≤a≤15mm;

[0023] (4) Calculate by adding 200g of nano powder per ton of molten steel (that is, 0.02% by mass), and weigh the total amount of nano additive particles required;

[0024] (5) Electric furnace smelting, the smelting steel type is hollow steel 55SiMnMo, after the molten steel composition and temperature meet the ...

Embodiment 2

[0029] (1) First, put the nano TiN powder into a container, add absolute ethanol, and then put it into an ultrasonic cleaning machine for ultrasonic dispersion, and wait until the ethanol is completely volatilized after dispersion;

[0030] (2) Mix the ultrasonically dispersed nano-powder with the auxiliary material (high-purity iron powder) that does not pollute the molten steel at a mass ratio of 1:10, and then mix it with a ball mill for a long time (≥48h);

[0031] (3) The mixed powder uniformly mixed in step (2) is pressed into cylindrical nano-additive particles with a powder molding machine, the cylindrical diameter (indicated by d) and height (indicated by h) range from 10mm≤d≤15mm, 10mm≤h≤15mm;

[0032] (4) Calculate by adding 200g of nano powder per ton of molten steel (that is, 0.02% by mass), and weigh the total amount of nano additive particles needed;

[0033] (5) Electric furnace smelting, the smelting steel is hollow steel 55SiMnMo, and the steel is tapped after the co...

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Abstract

The invention provides a method for toughening iron and steel materials by adding nano-particles, and relates to the technical fields of steel making and iron and steel material toughening. The method comprises the following steps of: preparing nano additive particles by a method of ultrasonic dispersion, mixing, ball-milling and dispersing with high purity iron powder and pressing; adding the nano additive particles along with steel stream or directly adding the nano additive particles to the bottom of a steel ladle before a deoxidizer is added in the steel taping process; and adding partial nano additive particles into a continuous casting mold or a central casting pipe in die casting. The nano additive particles are prepared by a pre-dispersion method, so that high dispersion and uniformity can be achieved after the nano-particles are added into the molten steel, the nano-particles can be used as nucleation of inclusions and nucleation cores of molten steel solidification to dispersively refine the inclusions and refine grains of steel so as to fulfill the aim of improving steel toughness. The method also can be used for toughening treatment on other metals or alloy structured materials besides the iron and steel materials.

Description

Technical field [0001] The invention relates to steelmaking and steel material strengthening and toughening technology, and specifically provides a method for improving the strength and toughness of steel by adding nano particles during the steelmaking process. Background technique [0002] Strengthening and toughening of steel materials is an important issue in the field of steel industry. It is an important way to reduce the quantity and longevity of steel, and to achieve energy saving and consumption reduction. It is the only way to develop high-performance steel. The current basic methods of strengthening and toughening steel are as follows: high-purity smelting (through various refining methods, reduce the content of harmful elements as much as possible, and reasonably control the state of inclusions), alloying and microalloying (forming fine precipitation in steel) Phase, strengthened with micro-defects), grain refinement and homogenization (achieved by multi-pass rolling a...

Claims

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Application Information

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IPC IPC(8): B22D1/00B22D11/11C21C7/00
Inventor 王国承方克明
Owner JIANGXI UNIV OF SCI & TECH