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Prepration method for forming ZrO2 nanoparticles in molten steel

A technology of nanoparticles and molten steel, applied in the field of iron and steel materials

Inactive Publication Date: 2011-09-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the solidification alloy needs to be deformed and heat-treated to obtain the nano-scale strengthening phase containing Zr, and to provide a method for forming ZrO in molten steel. 2 A method for preparing nanoparticles, which can directly obtain nano-reinforced phase ZrO in steel by melting and solidifying the alloy. 2 particles

Method used

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Embodiment 1

[0016] Smelting under atmospheric atmosphere, the highest temperature can be superheated to 1590°C, after the steel is completely melted, then overheated at 50-100°C, the chemical composition and mass percentage of the alloy steel are: C is 0.08%, Si is 0.36%, and Mn is 0.9 %, P is 0.0078%, S is 0.0004%, and the balance is Fe; after the alloy liquid level is stable, the oxygen content in the molten steel is measured to reach 60PPm, and the Fe-Zr alloy wire with a Zr content of 2% by mass percentage is selected , Fe-Zr alloy wire with a diameter of 1 mm is added to the molten steel with a wire feeder so that the mass percentage of Zr in the molten steel reaches 0.06%. After the Fe-Zr alloy is dissolved, keep it warm at 1550-1590°C for 10-15 minutes, and start pouring with cast iron ingots coated with ceramic paint. During the solidification process, spray water on the outer surface of the cast iron mold to ensure that the molten steel is The cooling rate during the process from...

Embodiment 2

[0018] Smelting under atmospheric atmosphere, the highest temperature can be overheated to 1600°C, after the steel is completely 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 100PPm. The Fe-Zr alloy wire with a Zr content of 8% by mass is added to the molten steel with a diameter of 3mm by a wire feeder so that the mass percentage of Zr in the molten steel reaches 0.3%. After the Fe-Zr alloy is dissolved, keep warm at 1550-1600°C for 15-20min, then cast the slab by continuous casting method, pour the molten steel into the crystallizer at a temperature of about 1550°C, add mold slag on the surface of the molten steel, and continuously cast The solidification cooling rate is about 500°C / min, and the thickness of the conti...

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Abstract

The present invention relates to a preparation method for forming nano-ZrO2 particles in molten steel, which comprises the steps of adding Fe-Zr alloy wires into the molten steel of low carbon steel or low carbon alloy steel with the oxygen concentration of not more than 100PPm, dissolving the Fe-Zr alloy, then keeping the temperature, starting to cast, and controlling the cooling speed during the solidification process when casting to be not lower than 500 DEG C / min; due to the containing of alloy elements of Zr and O of the precipitated phase of ZrO2 being higher than the melting point of a matrix alloy, the solubility of Zr and O is decreased along with the temperature decrease, and the greater super-cooling degree is formed by the faster cooling speed, thereby obtaining the strengthened solidified alloy dispersed and precipitated from the nano-ZrO2. The preparation method has the advantage that the nano-ZrO2 dispersed phase can be directly formed in the solidified alloy.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and relates to a method for forming ZrO in molten steel 2 Preparation method of nanoparticles. Background technique [0002] Nano-block metal materials have high strength, but low elongation. Nano-particle dispersion-strengthened metal materials can greatly increase the strength of the alloy while maintaining the elongation of the alloy, and its strengthening effect is better than that of the traditional steel industry. The micron-scale and sub-micron-scale second-phase particle dispersion strengthening used in the field, the research on nano-dispersed phase strengthened steel has become a hot spot in recent years. Nano-strengthening can not only greatly improve the strength of structural steel, but also improve the high-temperature creep performance of superalloys. Nanostrengthening technology has important application value for steel used in a wide range of fields such as automobile in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C22C38/50
Inventor 王自东林国标张建伟
Owner UNIV OF SCI & TECH BEIJING
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