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Fe-X-N grain refiner and preparation method thereof

A technology of grain refiner, fe35, which is applied in the field of metal materials, can solve problems such as easy segregation, and achieve the effects of simple preparation, grain refinement, and obvious refinement effect

Inactive Publication Date: 2010-03-03
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because TiN particles are relatively small, it is difficult to add it to the melt by blowing or wire feeding, and it is easy to segregate; Fu Jie, Zhu Jian, Di Lin et al. , Acta Metall Sinica, 2000, 36(8): 801~804" described: due to the low solubility of TiN in molten steel, large micron-sized particles are precipitated in the liquid state, and they will not dissolve in the subsequent heat treatment, which is very important for preventing crystallization. grain coarsening has no effect

Method used

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  • Fe-X-N grain refiner and preparation method thereof
  • Fe-X-N grain refiner and preparation method thereof
  • Fe-X-N grain refiner and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1, mixing iron with metals Ti, V and Nb, melting the mixture in a vacuum intermediate frequency induction furnace to obtain a melt,

[0026] For the mixing, the parts by weight of iron are 99.4 parts, the parts by weight of metal Ti are 0.3 parts, the parts by weight of metal V are 0.1 parts, and the parts by weight of metal Nb are 0.1 parts;

[0027] Step 2, when the temperature of the melt is 1650°C, nitrogen gas is introduced, and when the nitrogen partial pressure around the melt reaches 0.01Mpa, nitrogen gas is blown into the melt for 3 hours;

[0028] Step 3, stop blowing nitrogen gas, cut off the power, and obtain the Fe-X-N grain refiner.

[0029] The Fe-X-N grain refiner obtained in this example has the following components and mass percentages: 99.4% Fe, 0.3% Ti, 0.1% V, 0.1% Nb, and 0.1% N. The XN density in the obtained grain refiner is 10 8 piece / mm 3 ; The particle size of XN in the obtained grain refiner is mainly concentrated in 0.5-5 μm.

[003...

Embodiment 2

[0032] Step 1, mixing iron with metals Ti, V and Nb, melting the mixture in a vacuum intermediate frequency induction furnace to obtain a melt,

[0033] In the mixing, the parts by weight of iron are 67.5 parts, the parts by weight of metal Ti are 10 parts, the parts by weight of metal V are 5 parts, and the parts by weight of metal Nb are 10 parts;

[0034] Step 2, when the temperature of the melt is 1600°C, nitrogen gas is introduced, and when the nitrogen partial pressure around the melt reaches 0.05Mpa, nitrogen gas is blown into the melt for 1.5 hours;

[0035] Step 3, stop blowing nitrogen gas, cut off the power, and obtain the Fe-X-N grain refiner.

[0036] The Fe-X-N grain refiner obtained in this example has the following components and mass percentages: 67.5% Fe, 10% Ti, 5% V, 10% Nb, and 7.5% N. The XN density in the obtained grain refiner is 10 4 piece / mm 3 ; The particle size of XN in the obtained grain refiner is mainly concentrated in 0.5-5 μm.

Embodiment 3

[0038] Step 1, mix iron with metal Ti and Nb, and melt the mixture in a vacuum intermediate frequency induction furnace to obtain a melt

[0039] Said mixing, the parts by weight of iron is 35 parts, the parts by weight of metal Ti is 25 parts, and the parts by weight of metal Nb is 25 parts;

[0040] Step 2, when the temperature of the melt is 1550°C, nitrogen gas is introduced, and when the nitrogen partial pressure around the melt reaches 0.01Mpa, nitrogen gas is blown into the melt for 10s;

[0041] Step 3, stop blowing nitrogen gas, cut off the power, and obtain the Fe-X-N grain refiner.

[0042] The Fe-X-N grain refiner obtained in this example has the following components and mass percentages: 35% Fe, 25% Ti, 25% Nb, and 15% N. The XN density in the obtained grain refiner is 10 7 piece / mm 3 ; The particle size of XN in the obtained grain refiner is mainly concentrated in 0.5-5 μm.

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Abstract

The invention discloses to a Fe-X-N grain refiner and a preparation method thereof in the technical field of metal materials. Components of the Fe-X-N grain refiner by weight percentage are as follows: 35-99.4% of Fe, 0.1-15% of N and 0.5-50% of X; wherein, X is V or Nb or Ti or mixture of V and Nb. The preparation method of the Fe-X-N grain refiner comprises the following steps: mixing iron withthe metal X, melting the mixture in a vacuum intermediate frequency induction furnace to obtain molten mass; charging nitrogen gas when the temperature of the molten mass is 1550-1650 DEG C, adding the nitrogen gas to the molten mass when the nitrogen partial pressure around the molten mass is 0.01-0.1MPa for 10s-3h; stopping adding the nitrogen gas, cutting off the power to obtain the Fe-X-N grain refiner. The preparation method of the grain refiner is simple; the grain refiner is added to steel molten mass to refine steel grain, and proportion of zone of equiaxial crystals such as billet ascast structure is increased to above 60%.

Description

technical field [0001] The invention relates to a grain refiner in the technical field of metal materials and a preparation method thereof, in particular to an Fe-X-N grain refiner and a preparation method thereof. Background technique [0002] The structure of steel determines its performance, especially its strength and toughness. The finer the grain, the higher the strength and toughness of the steel. In the continuous casting process, if it is only cooled from the outside, the cooling rate inside the wide and thick billet is slow, and the nucleation core is less, and it will mainly grow in the form of columnar grains, resulting in defects such as coarse grains and center segregation, which are easy to Edge cracks occur. The key to solve this problem is to nucleate the molten steel, expand the proportion of the equiaxed grain area of ​​the slab, and refine the grains. Controlling the solidification structure of metals by adding nucleating agents is a commonly used meth...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/14C22C30/00C22C27/02C22C33/04C22C1/02B22D11/11
Inventor 高海燕阮晓明沈建国王超孙宝德郑庆王俊刘自立
Owner SHANGHAI JIAO TONG UNIV
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