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Added nano-reinforcement agent for improving mechanical properties of steel and its preparation and use method

A technology of strengthening agent and nano-oxide, applied in the field of iron and steel metallurgy, can solve the problems of smelting accidents, oxygen absorption of molten steel, and unsolved pollution, and achieve the effects of improving mechanical properties, preventing reduction, and eliminating surface effects.

Active Publication Date: 2018-08-07
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can effectively improve the mixing of nano-powders in molten steel, but due to the small particle size of pure iron powder, an oxide film (Fe 2 o 3 ), the existence of the oxide film will cause more free oxygen in the mixture, adding it to the molten steel will reduce the purity of the molten steel, and the timing of adding the molten steel is improper, and the nanoparticles are used as the nucleation center of other oxides to cause inclusions The change of type and size changed the original intention of joining
Chinese patent (CN104726639A) discloses a method for uniformly dispersing external nanoparticles in steel, using nano-oxides and low-melting-point nano-alloy powders for ball milling and mixing and pressing into blocks, and adding prefabricated blocks to molten steel through molybdenum rods, low The use of melting point nano-alloy powder can effectively improve the dispersion of nanoparticles in molten steel without reducing the purity of molten steel, but the addition of alloys to molten steel will cause changes in the composition of molten steel, resulting in smelting accidents and the use of molybdenum rods to stir or will cause molten steel to absorb oxygen
Although it can prevent molten steel from agitating and absorbing oxygen, it has not solved the problem of contamination of molten steel by adding low melting point alloys

Method used

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  • Added nano-reinforcement agent for improving mechanical properties of steel and its preparation and use method
  • Added nano-reinforcement agent for improving mechanical properties of steel and its preparation and use method
  • Added nano-reinforcement agent for improving mechanical properties of steel and its preparation and use method

Examples

Experimental program
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Embodiment 1

[0047] An external nano-reinforcing agent for improving the mechanical properties of steel, which contains nano-oxide particles and Fe, with a mass ratio of, nano-oxide particles: Fe=1:1; wherein, the nano-oxide particles are Y 2 o 3 .

[0048] A method for preparing an external nano-reinforcer for improving the mechanical properties of steel, comprising the following steps:

[0049] Step 1, ball mill coating

[0050] Nano oxide particles Y 2 o 3 , Nano Fe(OH) 3 and dispersant acetone are placed in a planetary ball mill for alloying to obtain a ball mill alloyed mixed material;

[0051] Among them, according to the mass ratio, the nano oxide particles Y 2 o 3 : Nano Fe(OH) 3 : acetone=1:2:0.15; nano oxide particles Y 2 o 3 The particle size is 60~90nm; Nano Fe(OH) 3 The particle size is 10-20nm;

[0052] The ball milling process parameters are: the ball milling mode adopts the intermittent type of ball milling 2h shutdown 0.5h; the rotating speed of the ball mill i...

Embodiment 2

[0067] An external nano-reinforcing agent for improving the mechanical properties of steel, which contains nano-oxide particles and Fe, and the mass ratio is, nano-oxide particles: Fe=1:1.5; wherein, the nano-oxide particles are ZrO 2 .

[0068] A method for preparing an external nano-reinforcer for improving the mechanical properties of steel, comprising the following steps:

[0069] Step 1, ball mill coating

[0070] Nano oxide particles ZrO 2 , Nano Fe(OH) 3 and dispersant acetone are placed in a planetary ball mill for alloying to obtain a ball mill alloyed mixed material;

[0071] Among them, according to the mass ratio, the nano-oxide particles ZrO 2 : Nano Fe(OH) 3 : Methanol, ethanol, acetone = 1:3:0.1; Nano oxide particles ZrO 2 The particle size is 50-70nm; nano-Fe(OH) 3 The particle size is 10-30nm;

[0072] The ball milling process parameters are: the ball milling mode adopts the intermittent type of ball milling 2h shutdown 0.5h; the rotating speed of the ...

Embodiment 3

[0087] An external nano-reinforcing agent for improving the mechanical properties of steel, which contains nano-oxide particles and Fe, with a mass ratio of nano-oxide particles: Fe=1:0.8; wherein, the nano-oxide particles are Ti 2 o 3 .

[0088] A method for preparing an external nano-reinforcer for improving the mechanical properties of steel, comprising the following steps:

[0089] Step 1, ball mill coating

[0090] Ti nanoparticles 2 o 3 , Nano Fe(OH) 3 and dispersant acetone are placed in a planetary ball mill for alloying to obtain a ball mill alloyed mixed material;

[0091] Among them, according to the mass ratio, nano-oxide particles Ti 2 o 3 : Nano Fe(OH) 3 : acetone = 1: 1.5: 0.12; nano oxide particles Ti 2 o 3 The particle size is 50-80nm; nano-Fe(OH) 3 The particle size is 10-30nm;

[0092] The ball milling process parameters are: the ball milling mode adopts the intermittent type of ball milling 2h shutdown 0.5h; the rotating speed of the ball mill i...

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Abstract

An external nano-strengthening agent that improves the mechanical properties of steel and its preparation and use methods belong to the field of iron and steel metallurgy. The components of the external nano-strengthening agent are nano-oxide particles and Fe, and the nano-oxide particles are one of Y2O3, ZrO2, Ti2O3 or Ce2O3; the preparation method includes ball milling and coating, dehydration crystallization, internal carbon pelletization and Baking coating; the method of use is to preheat the external nano-strengthening agent, pre-lay it on the bottom of the mold, and inject molten steel into the mold. This method uses Fe(OH)3 to pre-disperse nano-oxide particles, effectively destroying and eliminating the OH-effect. After the preparation process, Fe(OH)3 is gradually converted into Fe, and an external nano-strengthening agent is produced. During the casting process, the addition of nano-strengtheners will not affect the purity of the molten steel, and the nano-oxide particles will not denature or grow up. They are added to the molten steel to form a dispersed distribution phase, thereby effectively improving the mechanical properties of the steel.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and provides an external nano-strengthening agent for improving the mechanical properties of steel and its preparation and use methods. Background technique [0002] Due to the use of deoxidizers and refractory materials in the process of iron and steel metallurgy, non-metallic inclusions will inevitably be generated or remain in steel. It is generally believed that non-metallic inclusions are harmful impurities in steel and the main cause of defects in steel products. Effective removal of non-metallic inclusions in steel has always been the direction of efforts of metallurgists. With the development of science and technology, relevant studies have shown that small-sized inclusions can be used as the nucleation centers of nitrides and carbides during solidification and thermal processing. By controlling the type, size, quantity and distribution of inclusions, the Comprehensive mechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00
CPCC21C7/0037C22C32/0026
Inventor 战东平邱国兴葛启桢杨永坤蔡南孟沈童刘志明姜周华
Owner NORTHEASTERN UNIV LIAONING
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