Fe-Mn-Al-C series high-strength low-density steel and preparation method thereof

A fe-mn-al-c, low-density steel technology, applied in the field of Fe-Mn-Al-C high-strength low-density steel and its preparation, can solve the problems of deteriorated plasticity, reduced formability, difficult springback detection and Control and other issues to achieve the effect of improving strength and elongation and increasing strength

Active Publication Date: 2021-08-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ultra-high-strength steel also has a series of problems: as the strength of the steel plate increases, its formability decreases; Rebound, and rebound is difficult to detect and control
This scheme obtains Fe-Mn-Al-C low-density steel with high strength and good plasticity through the adjustment of alloy composition and processing technology, but because this scheme does not consider the addition of Cr element, the structure of the steel is austenite +Ferrite+κ-type carbide three-phase, in which the existence of κ-type carbide deteriorates the plasticity of the steel, and the density of the steel is still relatively high

Method used

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  • Fe-Mn-Al-C series high-strength low-density steel and preparation method thereof
  • Fe-Mn-Al-C series high-strength low-density steel and preparation method thereof
  • Fe-Mn-Al-C series high-strength low-density steel and preparation method thereof

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Embodiment 1

[0024] A method for preparing Fe-Mn-Al-C-based high-strength low-density steel in this embodiment, the high-strength low-density steel includes the following elemental components in mass percentages: C 1.21%, Mn 25.03%, Al 11.93 %, Ni 6.95%, and the balance is Fe. Concrete preparation method is as follows:

[0025] (1) Smelting: smelting the raw materials of high-strength low-density steel through induction melting furnace;

[0026] (2) solidification casting: the molten steel obtained in the step (1) is injected into a mould, and an ingot is produced by die casting;

[0027](3) Thermal processing (forging / rolling): the ingot obtained in step (2) is opened and then heated and kept for 1 hour at a temperature of 1050°C. After the heat preservation is over, the ingot is forged with a forging machine. The forging ratio is 2. After the forging is completed, it is air-cooled to room temperature. The forging temperature is always kept within the temperature range of 1000-1100 °C. ...

Embodiment 2

[0030] A method for preparing Fe-Mn-Al-C high-strength low-density steel in this embodiment, the high-strength low-density steel includes the following elemental components in mass percentages: C 1.49%, Mn 34.88%, Al 10.12 %, Ni 5.03%, Cr1.87%, Si 1.47%, and the balance is Fe. The specific preparation method is as follows:

[0031] (1) Smelting: smelting the raw materials of high-strength and low-density steel through a converter;

[0032] (2) solidification casting: the molten steel obtained in the step (1) is injected into the mould, and continuous casting is adopted to produce a slab;

[0033] (3) Hot forging: the cast slab obtained in step (2) is opened and heated for 5 hours, and the heat preservation temperature is 1200°C. After the heat preservation is over, use a forging machine to forge the billet. The forging ratio is 3. After the forging is completed, it is air-cooled to room temperature. The forging temperature is always kept within the temperature range of 1000-1...

Embodiment 3

[0037] A method for preparing Fe-Mn-Al-C high-strength low-density steel in this embodiment, the high-strength low-density steel includes the following elemental components in mass percentages: C 1.52%, Mn 30.23%, Al 12.19 %, Cr 5.07%, and the balance is Fe. The specific preparation method is as follows:

[0038] (1) Smelting: Smelting raw materials of high-strength and low-density steel through an electric furnace;

[0039] (2) solidification casting: the molten steel obtained in the step (1) is injected into a mould, and an ingot is produced by die casting;

[0040] (3) Thermal processing (forging / rolling): the ingot obtained in step (2) was opened and then heated and kept for 8 hours at a temperature of 1150°C. After the heat preservation is over, the ingot is forged with a forging machine. The forging ratio is 2.4. After the forging is completed, it is air-cooled to room temperature. The forging temperature is always kept within the temperature range of 1000-1100 °C. Reh...

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Abstract

The invention provides a Fe-Mn-Al-C series high-strength low-density steel and a preparation method thereof. The high-strength low-density steel comprises the following element components in percentage by mass: 1.0 to 2.0% of C, 20 to 40% of Mn, 10 to 14% of Al, more than or equal to 2% and less than or equal to 15% of Ni and Cr, and the balance of Fe. According to the preparation method, after the steps of steel smelting, solidification casting, hot working (forging / rolling) and the like are carried out, a steel plate is subjected to solution treatment for 10 min to 6 h within the temperature range of 1100 DEG C to 1200 DEG C and then cooled to the room temperature, and the high-strength low-density steel is obtained. According to the Fe-Mn-Al-C series high-strength low-density steel and the preparation method thereof, the austenite-based high-strength low-density steel with a uniform structure is finally obtained by regulating and controlling alloy components and a processing technology, the yield strength of the austenite-based high-strength low-density steel is larger than or equal to 1000 MPa, and the density is 6.0-6.6 g / cm < 3 >.

Description

technical field [0001] The invention relates to the fields of engineering steel and steel for consumer electronics parts, in particular to a Fe-Mn-Al-C series high-strength low-density steel and a preparation method thereof. Background technique [0002] With the increasing requirements for energy conservation and environmental protection and the drive of economic benefits, automobile lightweight has become an urgent need and future development trend of the automobile industry. At present, there are three main ways to realize the lightweight of automobiles: one is to use lightweight raw materials, such as the use of aluminum alloys for vehicles, magnesium alloys for vehicles, engineering plastics, and carbon fiber composite materials. Although the use of lightweight raw materials can reduce the overall weight of the car, aluminum alloys have complex forming processes, poor welding performance, and low collision absorption energy; magnesium alloys have poor plasticity, poor t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/06C22C38/38C22C38/08C22C38/04C22C38/02C22C38/12C22C38/16C22C38/14C22C38/20C22C38/22C22C38/26C22C38/28C22C38/24C22C38/32
CPCC22C38/58C22C38/06C22C38/38C22C38/08C22C38/04C22C38/02C22C38/12C22C38/16C22C38/14C22C38/005C22C38/20C22C38/22C22C38/26C22C38/28C22C38/24C22C38/32C22C38/34C22C38/48C22C38/50C22C38/46C22C38/54C22C38/42C22C38/44C22C38/36C22C38/56C22C30/00C22C30/02C21D8/005C21D2211/001
Inventor 罗海文刘志鹏
Owner UNIV OF SCI & TECH BEIJING
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