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Low-density Ti3Al strengthened super-strength steel and preparing method thereof

An ultra-high-strength steel and low-density technology, applied in the field of metal materials, can solve the problems of reducing steel density and disadvantages, and achieve the effect of increasing tensile strength and reducing density

Active Publication Date: 2017-02-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An existing low-density high-plastic NiAl reinforced ultra-high-strength steel mainly relies on the addition of Ni elements to form NiAl to increase the tensile strength of the steel, so that the tensile strength can reach more than 1350MPa, but the density of Ni is 8.9g / cm 3 , higher than the density of steel (7.8g / cm 3 ), which is not conducive to reducing the density of steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A low-density Ti 3 The preparation method of Al reinforced ultra-high strength steel specifically comprises the following steps:

[0034] (1) Smelting: According to 1 in Table 1 # The chemical composition mass percentage of the ultra-high-strength steel corresponding to the furnace is weighed to select raw materials, and vacuum smelting is carried out first: the raw materials are loaded into a vacuum induction furnace, and when the vacuum is evacuated to <50Pa, power is supplied for heating, and the input is gradually increased. Power, until the raw materials are completely melted and no bubbles overflow from the surface of the molten pool, keep the temperature at 1700°C for 30 minutes for refining at a vacuum degree of <1Pa, fully deoxidize and carry out alloying under the protection of argon, then pour and heat in a vacuum Cool down to obtain steel ingots; then remelt: put the steel ingots into the electroslag furnace, pass the argon gas protection, the pressure is 1...

Embodiment 2

[0039] A low-density Ti 3 The preparation method of Al reinforced ultra-high strength steel specifically comprises the following steps:

[0040] (1) Smelting: According to 2 in Table 1 # The chemical composition mass percentage of the ultra-high-strength steel corresponding to the furnace is weighed to select raw materials, and vacuum smelting is carried out first: the raw materials are loaded into a vacuum induction furnace, and when the vacuum is evacuated to <50Pa, power is supplied for heating, and the input is gradually increased. Power, until the raw materials are completely melted and no bubbles overflow from the surface of the molten pool, keep the temperature at 1700°C for 30 minutes for refining at a vacuum degree of <1Pa, fully deoxidize and carry out alloying under the protection of argon, then pour and heat in a vacuum Cool down to obtain steel ingots; then remelt: put the steel ingots into the electroslag furnace, pass through the argon gas protection, the press...

Embodiment 3

[0045] A low-density Ti 3 The preparation method of Al reinforced ultra-high strength steel specifically comprises the following steps:

[0046] (1) Smelting: According to 3 in Table 1 # The chemical composition mass percentage of the ultra-high-strength steel corresponding to the furnace is weighed to select raw materials, and vacuum smelting is carried out first: the raw materials are loaded into a vacuum induction furnace, and when the vacuum is evacuated to <50Pa, power is supplied for heating, and the input is gradually increased. Power, until the raw materials are completely melted and no bubbles overflow from the surface of the molten pool, keep the temperature at 1650°C for 1.5 hours for refining at a vacuum degree of <1Pa, fully deoxidize and alloy under the protection of argon, then pour and place in a vacuum Cool down to obtain steel ingots; then remelt: put the steel ingots into the electroslag furnace, pass through the argon gas protection, the pressure is 150Pa,...

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Abstract

The invention relates to low-density Ti3Al strengthened super-strength steel and a preparing method thereof, and belongs to the field of metal materials. The chemical components of the steel comprise, by mass percent, 0.5% to 1.5% of C, 15% to 30% of Mn, 5% to 10% of Al, 5% to 20% of Ti, not larger than 5% of Cr, not larger than 0.2% of Nb, not larger than 2% of Si, not larger than 0.6% of B and the balance Fe and inevitable impurities. Through adding of Ti, Ti3Al is formed, the Ti3Al and k-carbide can jointly generate precipitation strengthening, the steel has the super-high strength and the good plasticity while the density is effectively reduced, the tensile strength reaches above 1350MPa, the ductility reaches above 10%, the density ranges from 6.5 g / cm<3> to 6.9 g / cm / <3>, and the manufacturing requirement of automobile structural parts is met.

Description

technical field [0001] The invention relates to a low-density Ti 3 Al reinforced ultra-high strength steel and its preparation method. It belongs to the field of metal materials. Background technique [0002] With the increasing promotion of the green concept of energy saving and emission reduction, reducing the weight of automobiles has become the theme of today's market development. The use of high-strength steel instead of ordinary steel can increase the specific strength (ratio of strength to density) of steel, thereby reducing the thickness of the required steel plate while ensuring mechanical properties, and reducing the weight of the vehicle body. Another effective way to increase the specific strength of steel is to reduce the density of steel by adding light alloying element Al while maintaining high strength. This approach can further increase the specific strength of steel, so the development of high-strength and low-density steel is an urgent need to achieve l...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/06C22C38/28C22C38/02C22C38/26C22C38/34C22C38/32C22C30/00C21D8/00C22F1/16
CPCC21D8/005C22C30/00C22C38/02C22C38/06C22C38/26C22C38/28C22C38/32C22C38/34C22C38/38C22F1/16
Inventor 程兴旺李壮王迎春李树奎
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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