Low-density ultrahigh-strength steel and preparation method thereof

An ultra-high-strength steel and low-density technology, applied in the field of metal materials, can solve the problems of cost increase and achieve the effects of low cost, reliable process and simple operation

Active Publication Date: 2016-12-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A low-density, high-plasticity NiAl-enhanced ultra-high-strength steel has been reported, mainly relying on the addit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing low-density ultra-high-strength steel, specifically comprising 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 100Pa, send electricity ...

Embodiment 2

[0039]A method for preparing low-density ultra-high-strength steel, specifically comprising 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 pressure is 120Pa, and heat w...

Embodiment 3

[0045] A method for preparing the low-density ultra-high-strength steel, specifically comprising 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, send electricity t...

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PUM

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Abstract

The invention relates to low-density ultrahigh-strength steel and a preparation method thereof, and belongs to the field of metal materials. The steel comprises the following chemical components in percentage by mass: 0.6 to 1.6 percent of C, 5 to 10 percent of Al, 15 to 30 percent of Mn, 0.01 to 0.2 percent of Nb, 0.1 to 3 percent of Mo, less than or equal to 5 percent of Cr, less than or equal to 0.5 percent of Ti, less than or equal to 2 percent of Si, less than or equal to 0.6 percent of B, and the balance of Fe and unavoidable impurity elements. According to the low-density ultrahigh-strength steel and the preparation method thereof, a NbMoC phase which is finely dispersed precipitates by compounding and adding the Nb and the Mo; precipitation is strengthened by cooperating with a kappa-carbide; the tensile strength reaches over 1,350 MPa, the elongation reaches over 10 percent and the density is 6.8 to 7.0 g/cm<3>; the low-density ultrahigh-strength steel is low in cost, is suitable for light weight of traffic transportation tools, such as vehicles and airplanes, and meets the development concept of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to a low-density ultra-high-strength steel and a preparation method thereof, belonging to the field of metal materials. Background technique [0002] In order to save energy, improve fuel economy and reduce CO 2 Lightweight has become an important development trend of various means of transportation. One way of thinking is to reduce the amount of steel required by improving the mechanical properties of steel such as strength and plasticity, so as to achieve the purpose of weight reduction. Another way of thinking is to reduce the density of steel by adding alloy elements such as Al, and at the same time ensure the mechanical properties of steel by optimizing the composition and controlling the treatment process, so as to obtain steel with both low density and high strength. Studies have shown that for every 1% Al added, the density of steel decreases by 0.101g / cm 3 , can reduce weight by about 1.3%; for every 1% of C added, the...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C38/04C22C38/12C22C38/18C22C38/14C22C38/02C22C38/32C21D8/00
CPCC21D8/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/18C22C38/32
Inventor 王迎春李壮程兴旺李树奎姚春发
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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