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A kind of TIC-added low-density high-strength steel and preparation method thereof

A high-strength steel, low-density technology used in the field of metal materials

Active Publication Date: 2020-11-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lower stiffness means that the body steel plate needs to be thickened to reduce the corresponding adverse effects. Obviously, this is contradictory to the purpose of weight reduction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of low-density high-strength steel added with TiC, the method steps are as follows:

[0037](1) Ingredients: According to 1 in Table 1 # According to the mass percentage of the matrix chemical composition of the high-strength steel corresponding to the furnace, the required element powder raw materials are weighed out and poured into a ball mill jar. Then mix TiC particles in the low-density steel matrix powder, according to 1 in Table 2 # The mass percentage ratio corresponding to the furnace requires weighing out ultrafine TiC powder (with a particle size of 0.01-1.0 μm) and pouring it into a ball mill jar to obtain a mixed powder.

[0038] (2) Ball mill mixing: put stainless steel balls into a ball mill tank with a ball-to-material ratio of 4:1, set the speed at 200rpm, place the ball mill tank in a ball mill for vacuum ball milling for 16 hours, and mix well to obtain a composite powder .

[0039] (3) Hot pressing sintering: Pour the composit...

Embodiment 2

[0042] A preparation method of low-density high-strength steel added with TiC, the method steps are as follows:

[0043] (1) Ingredients: According to 2 in Table 1 # According to the mass percentage of the matrix chemical composition of the high-strength steel corresponding to the furnace, the required element powder raw materials are weighed out and poured into a ball mill jar. Then mix TiC particles in the low-density steel matrix powder, according to Table 2 in 2 # The mass percentage ratio corresponding to the furnace requires weighing out ultrafine TiC powder (with a particle size of 0.01-1.0 μm) and pouring it into a ball mill jar to obtain a mixed powder.

[0044] (2) Ball mill mixing: put stainless steel balls into a ball mill tank with a ball-to-material ratio of 4:1, set the speed at 400rpm, place the ball mill tank in a ball mill for vacuum ball milling for 10 hours, and mix well to obtain a composite powder .

[0045] (3) Hot pressing sintering: Pour the composi...

Embodiment 3

[0048] A preparation method of low-density high-strength steel added with TiC, the method steps are as follows:

[0049] (1) Ingredients: According to 3 in Table 1 # According to the mass percentage of the matrix chemical composition of the high-strength steel corresponding to the furnace, the required element powder raw materials are weighed out and poured into a ball mill jar. Then mix TiC particles in the low-density steel matrix powder, according to the 3 in Table 2 # The mass percentage ratio corresponding to the furnace requires weighing out ultrafine TiC powder (with a particle size of 0.01-0.5 μm) and pouring it into a ball mill jar to obtain a mixed powder.

[0050] (2) Ball mill mixing: put stainless steel balls into a ball mill tank with a ball-to-material ratio of 4:1, set the speed at 500 rpm, place the ball mill tank in a ball mill for vacuum ball milling for 4 hours, and mix well to obtain a composite powder .

[0051] (3) Hot press sintering: pour the compos...

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Abstract

The invention relates to TiC-added low-density high-strength steel and a preparation method thereof, and belongs to the technical field of metal materials. The steel is composed of a matrix and TiC, wherein the mass fraction of the matrix is 88.4%-96.3% and the mass fraction of the TiC is 3.7%-11.6% on the basis that the mass fraction of the steel is 100%; and on the basis that the total mass of the matrix is 100%, the matrix comprises the following chemical components of, in percentage by mass, 0.5%-1.2% of C, 15%-30% of Mn, 5%-10% of Al, less than or equal to 5% of Cr, less than or equal to0.1% of Nb, less than or equal to 2% of Si, less than or equal to 0.6% of B and the balance Fe and inevitable impurities. Raw material powder is mixed and subjected to ball milling, hot pressed sintering and heat treatment so as to obtain the steel. According to the preparation method, the added TiC is uniformly distributed, and meanwhile the elasticity modulus of the steel is effectively improved, the strength of the steel is improved to a certain extent, and the density of the steel is reduced as well.

Description

technical field [0001] The invention relates to a low-density high-strength steel added with TiC and a preparation method thereof. It belongs to the technical field of metal materials. Background technique [0002] With global warming, energy shortage and other issues are becoming increasingly prominent, reducing greenhouse gas emissions and improving energy efficiency have become important development goals pursued by the automotive industry, and reducing body weight is an effective way to achieve this goal. By using high-strength steel, the thickness of the steel plate required for the car body can be reduced under the condition of ensuring the performance, reducing the amount of steel, thereby reducing the weight of the car body. In addition, the use of low-density high-strength steel is another effective way to reduce weight. Reducing the density of steel is mainly achieved by adding light alloy element Al, supplemented by optimized composition and process to ensure th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C22C38/32C22C38/34C22C38/38C22C33/02C21D6/00
CPCC21D6/002C21D6/005C21D6/008C22C33/0292C22C38/02C22C38/04C22C38/06C22C38/26C22C38/32C22C38/34C22C38/38
Inventor 王迎春李壮程兴旺梁嘉昕李树奎
Owner BEIJING INSTITUTE OF TECHNOLOGYGY