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1500MPa ultrahigh-strength low-density steel and preparation method thereof

A technology of ultra-high-strength, low-density steel, applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve problems such as low plasticity and poor comprehensive mechanical properties

Active Publication Date: 2021-05-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low plasticity and poor comprehensive mechanical properties of the existing medium-low-manganese low-density steel, the present invention provides a 1500MPa ultra-high-strength low-density steel and its preparation method

Method used

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  • 1500MPa ultrahigh-strength low-density steel and preparation method thereof
  • 1500MPa ultrahigh-strength low-density steel and preparation method thereof
  • 1500MPa ultrahigh-strength low-density steel and preparation method thereof

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preparation example Construction

[0037] A method for preparing 1500MPa ultra-high-strength low-density steel as described above, comprising the following steps:

[0038] S1: Melting: mix C, Mn, Al, Cr and Fe according to the mass percentage, clean the ingredients and ultrasonically treat them, then dry them and put them in a vacuum induction suspension melting furnace for melting. Cool after 45min to obtain material ingot;

[0039] S2: Formed plate: heat the ingot to 1500-1600°C, melt the ingot and then perform a sub-rapid solidification forming process to obtain a formed plate. The thickness of the formed plate is 2-3 mm; the cooling rate in the sub-rapid solidification forming process is 10~1000K / s; here it is worth noting that the sub-rapid solidification forming process means that the cooling rate is between 10~10 3 K / s, the principle of sub-rapid solidification is usually achieved by increasing the solidification cooling rate and increasing the degree of solidification supercooling. It is a solidificati...

Embodiment 1

[0044] A 1500MPa ultra-high-strength low-density steel, including the following components in mass percentage: C: 1.39%, Mn: 12.15%, Al: 9.11%, Cr: 3.01%, and the balance is Fe and unavoidable impurity elements in iron. Its preparation method comprises the following steps:

[0045] S1: Melting: Batching C, Mn, Al, Cr and Fe according to the mass percentage, cleaning the ingredients, ultrasonic treatment, drying and melting in a vacuum induction suspension melting furnace, pumping the vacuum induction suspension melting furnace to 0.005 After MPa, the furnace chamber is filled with argon gas with a purity of 99.9% as a protective atmosphere for melting, and it is filled to 0.03Mpa. The heating power of the vacuum induction suspension melting furnace is 28KW~41KW, the heating time is 6~7min, and the melting temperature is 1600~ 1650°C, keep warm for 5 to 45 minutes and then cool to obtain ingots;

[0046] S2: Formed plate: heat the ingot to 1520-1570°C, melt the ingot and put i...

Embodiment 2

[0049] A 1500MPa ultra-high-strength low-density steel, including the following components in mass percentage: C: 1.03%, Mn: 8.17%, Al: 10.87%, Cr: 1.62%, and the balance is Fe and unavoidable impurity elements in iron. Its preparation method comprises the following steps:

[0050] S1: Melting: Batch C, Mn, Al, Cr and Fe according to the mass percentage, clean and ultrasonically treat the ingredients, dry them and put them in a vacuum induction suspension melting furnace for smelting, and pump the vacuum in the induction suspension melting furnace to 0.005 After MPa, the furnace chamber is filled with argon gas with a purity of 99.9% as the smelting protective atmosphere, and it is filled to 0.03Mpa. The heating power of the vacuum induction suspension melting furnace is 28KW~41KW, the heating time is 6~7min, and the melting temperature is 1600~ 1650°C, keep warm for 5 to 45 minutes and then cool to obtain ingots;

[0051] S2: Formed plate: heat the ingot to 1520-1570°C, melt...

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Abstract

The invention discloses 1500MPa ultrahigh-strength low-density steel and a preparation method thereof, and belongs to the field of advanced metal materials. Aiming at the problems of low plasticity and poor comprehensive mechanical property of existing medium-low manganese low-density steel, the invention provides the 1500MPa ultrahigh-strength low-density steel which comprises the following components in percentage by mass: 1-1.6% of C, 8-16% of Mn, 6-11% of Al, 1.5-9% of Cr and the balance of Fe and inevitable impurity elements in iron. By adding the chromium element, the solid solution limit of carbon atoms is improved, the solidification rate of molten steel is high in the solidification process, enrichment of kappa carbides at the grain boundary of a low-density steel matrix and precipitation of intracrystalline coarse kappa carbides are inhibited, and therefore the plasticity of the steel is greatly improved. In addition, the element Cr is beneficial to the corrosion resistance and the oxidation resistance of the steel matrix. The tensile strength of the steel reaches 1500 MPa, the percentage elongation after fracture ranges from 10% to 50%, and the mechanical property is stable. According to the preparation method, the strength is further improved, the process is simple, consumed time is short, and the preparation and production efficiency of the high-performance low-density steel plate is greatly improved.

Description

technical field [0001] The invention belongs to the field of advanced metal materials, and more specifically relates to a 1500MPa ultra-high-strength low-density steel and a preparation method thereof. Background technique [0002] Environmental protection and energy saving has become a topic of global concern, and reducing the weight of the car body is one of the important measures to improve fuel economy and save energy. There are two main ways to realize the lightweight of automobiles. One is to use lightweight materials, such as the use of aluminum and aluminum alloys, magnesium and magnesium alloys, and engineering plastics. Although the use of this type of material can reduce the weight of the automobile body, the lower strength limits the application of this type of material in stressed structural parts, and the higher production cost also limits the promotion of this type of material in engineering applications. The second is to use low-density high-strength new ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/38C21D1/26C21D6/00C21D8/02C21D9/00C22C33/04
CPCC21D1/26C21D6/002C21D8/0236C21D9/0081C22C33/04C22C38/06C22C38/38
Inventor 宋长江张健康张云虎翟启杰
Owner SHANGHAI UNIV
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