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Preparation method for forming Ti2O3 nano particles in molten steel

A liquid steel, nano technology, applied in the field of steel materials

Inactive Publication Date: 2010-07-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the Ti-containing nano-scale strengthening phase obtained in steel by alloy smelting is mainly nitride or carbonitride, which generally needs to be deformed and heat-treated to obtain the solidified alloy; and directly through the method of alloy smelting and solidification, nano-scale Ti is obtained in steel. Strengthening phase Ti 2 o 3 Particles are rarely reported

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Smelting is carried out under an argon protective atmosphere. After all the steel is melted, it is overheated at 1600°C. The chemical composition and mass percentage of the alloy steel are: C is 0.08%, Si is 0.36%, Mn is 0.9%, P is 0.0078%, S It is 0.0004%, and the balance is Fe; after the alloy liquid level is stable, the oxygen content in the molten steel reaches 10PPm through measurement, and the Fe-Ti alloy wire with a Ti content of 5% in mass percentage is selected, and the diameter is A 3mm Fe-Al alloy wire is added into the molten steel so that the mass percentage of Ti in the molten steel reaches 0.06%. After the Fe-Ti alloy is dissolved, heat it at 1580-1600°C for 1-2 minutes, then start pouring 10-15 minutes later. Cast iron ingots coated with ceramic coatings are used for die casting and centrifugal casting, the centrifugal speed is 250 rpm, and the linear velocity of the metal liquid flow is about 3m / s~8m / s; during the solidification process, water is spraye...

Embodiment 2

[0021] Smelting under atmospheric atmosphere, the maximum temperature can be overheated to 1600°C, after all the steel is melted, then overheated at 50-100°C, the chemical composition and mass percentage of the alloy steel are: C: 0.01%, Si: 0.16%, Mn: 0.47%, P: 0.01%, S: 0.01%, Cr: 0.5%, Ni: 0.5%, Mo: 0.6%, and the balance Fe; after the alloy liquid level is stable, the oxygen content in the molten steel is measured to reach 90PPm. The Fe-Ti alloy wire with a Ti content of 10% by mass percentage is added to the molten steel with a diameter of 2mm by a wire feeder so that the mass percentage of Ti in the molten steel reaches 0.3%. After the Fe-Ti alloy is dissolved and kept at 1570-1590°C for 10-15 minutes, the slab is cast by the continuous casting method. The temperature of the molten steel poured into the crystallizer is about 1550°C. The surface of the molten steel is covered with mold slag. The molten metal is equipped with an electromagnetic stirring device to promote th...

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Abstract

The invention belongs to the field of steel material, in particular to a preparation method for forming Ti2O3 nano particles in molten steel. The method has the following characteristics that: Fe-Ti alloy wires are added in molten low-carbon steel or low-carbon alloy steel with the oxygen concentration of less than 100PPm, so that molten steel containing O and Ti is obtained; since the alloying elements Ti and O of precipitated phase Ti2O3 higher than the melting point of matrix alloy are contained, the solubility of Ti and O reduces with the decrease of the temperature, the high cooling speed can form high supercooling degree, meanwhile, the melt can form the high linear rate of flow in the process of solidification, and thereby solidified alloy strengthened by dispersed and precipitated nano Ti2O3 is obtained. The invention has the following advantages that: nano Ti2O3 dispersed phase can be directly formed in the solidified alloy, and thereby the strength of the alloy is enhanced under the premise that the plasticity and toughness of the alloy are nearly kept unchanged.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and relates to a method for forming nano-Ti in molten steel 2 o 3 Method of preparation of particles. Background technique [0002] Compared with nano-block metal materials, nano-particle dispersion-strengthened metal materials can maintain the elongation of the alloy, while greatly increasing the strength of the alloy, and the strengthening effect is better than the micron and sub-micron used in the traditional steel industry. The second phase particle dispersion strengthening, nano-dispersed phase strengthening of steel research has become a hot spot in recent years. Nanostrengthening can not only greatly increase the strength of structural steel, but also improve the high temperature creep performance of alloys. Nanostrengthening technology has important application value for steel used in a wide range of fields such as automobile industry, shipbuilding industry, and electric power i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/00C22C38/60C22C38/50
Inventor 王自东张建伟林国标
Owner UNIV OF SCI & TECH BEIJING
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