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Fe-X-C grain refiner and preparation method thereof

A grain refiner, fe-x-c technology, applied in the field of metal materials, can solve problems such as easy segregation, and achieve the effects of simple preparation, low cost and grain refinement

Inactive Publication Date: 2011-09-28
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively small size of TiN particles, it is difficult to add it to the melt by blowing and wire feeding, and it is easy to segregate

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] As shown in Table 1, the preparation process of this embodiment includes the following steps:

[0028] Step 1, mixing Fe-C alloy with metal Ti, melting the mixture in a vacuum intermediate frequency induction furnace to obtain a melt; the mixing needs to make the mass percentage of each element in the obtained mixture: Fe 99.4%, Ti 0.5% , C 0.1%;

[0029] Step 2, when the temperature of the melt is 1650°C, feed argon into the melt, the flow rate of the argon is 1000ml / min, and the time is 3h;

[0030] Step 3: Stop feeding the argon gas, cut off the power, and obtain the steel grain refiner.

[0031] The TiC particle size in the grain refiner prepared in this example is mainly concentrated in 0.5-5 μm, and the TiC density is 10 4 piece / mm 3 .

[0032] After heating 409L ferritic stainless steel to 1530°C in a vacuum intermediate frequency induction furnace, the molten steel is cast. The macrostructure of 409L steel without adding refiner is as follows figure 2 As ...

Embodiment 2

[0034] As shown in Table 1, the preparation process of this embodiment includes the following steps:

[0035] Step 1, mixing Fe-C alloy with metal Ti, metal V and metal Nb, melting the mixture in a vacuum intermediate frequency induction furnace to obtain a melt; the mixing needs to make the mass percentage of each element in the obtained mixture: Fe 35%, Ti25%, Nb 25%, C 15%;

[0036] Step 2, when the temperature of the melt is 1600°C, argon is introduced into the melt, the flow rate of the argon is 500ml / min, and the time is 1.5h;

[0037] Step 3: Stop feeding the argon gas, cut off the power, and obtain the steel grain refiner.

[0038] The particle density of XC in the grain refiner prepared in this embodiment is 10 7 piece / mm 3 . The grain refiner prepared in this embodiment can refine the grains of the steel, so that the proportion of equiaxed grain regions in the as-cast structure of the billet can be increased.

Embodiment 3

[0040] As shown in Table 1, the preparation process of this embodiment includes the following steps:

[0041] Step 1, mix pure iron, graphite with metal Ti, metal V and metal Nb, and melt the mixture in a vacuum intermediate frequency induction furnace to obtain a melt; the mixing needs to make the mass percentage of each element in the obtained mixture: Fe 67.5%, Ti10%, V 5%, Nb 10%, C 7.5%;

[0042] Step 2, when the temperature of the melt is 1550°C, feed argon into the melt, the flow rate of the argon is 100ml / min, and the time is 10s;

[0043] Step 3: Stop feeding the argon gas, cut off the power, and obtain the steel grain refiner.

[0044] The XC density in the grain refiner prepared in this embodiment is 10 8 piece / mm 3 . The grain refiner prepared in this embodiment can refine the grains of the steel, so that the proportion of equiaxed grain regions in the as-cast structure of the billet can be increased.

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Abstract

The invention discloses a Fe-X-C grain refiner and a preparation method thereof, belonging to the technical field of metal materials. The Fe-X-C grain refiner comprises the following components by weight percent: 35-99.4 percent of Fe, 0.1-15 percent of C and 0.5-50 percent of X, wherein X is one or more selected from Ti, V and Nb. The preparation method of the Fe-X-C grain refiner comprises the following steps : firstly, taking an alloy of Fe and C to mix with a metal X; or taking a pure iron and graphite to mix with the metal X; and smelting a mixture in vacuum in a frequency induction furnace to obtain a fusant, wherein the mixture contains 35-99.4 percent of Fe, 0.1-15 percent of C and X of the balance; secondly, leading argon into the fusant for 10s-3h when the fusant is at 1550-1650DEG C; and thirdly, stopping leading the argon and switching off the electricity to obtain the Fe-X-C grain refiner. The grain refiner has simple preparation; and the grain refiner can be added into a steel fusant to refine the grains of the steel so that the proportion of a billet steel casting tissue equiaxed grain zone is improved by 60 percent.

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-C 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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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/00B22D27/20C22C1/02C22C14/00C22C27/02C22C30/00C22C38/14C22C38/12
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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