Nb-contained high-strength high-tenacity low-density steel for automobile and preparation method thereof

A high-toughness, low-density steel technology, applied in the field of metal materials, can solve the problems of low-density steel being easily corroded and oxidized, poor controllability of the second phase, and restricted wide application, etc., to achieve excellent corrosion resistance, reliable method, improved The effect of mechanical properties

Inactive Publication Date: 2019-12-24
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the strengthening method of Fe-Mn-Al-C low-density steel mainly relies on the precipitation strengthening effect of κ-carbide, and there are problems such as poor controllability of the second phase and complicated equipment and technology.
At the same time, Fe-Mn-Al-C low-density steel is easily corroded and oxidized, which restricts its wide application
At present, the preparation method of Fe-Mn-Al-C low-density steel with high strength, high toughness and excellent corrosion resistance has not been reported by simple technological means.

Method used

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  • Nb-contained high-strength high-tenacity low-density steel for automobile and preparation method thereof
  • Nb-contained high-strength high-tenacity low-density steel for automobile and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0046] The present embodiment provides a kind of preparation method of Nb-containing low-density steel for automobile, specifically comprises the following steps:

[0047] Step 1. Smelting: According to the mass percentage corresponding to 1# steel in Table 1, weigh raw materials with a purity greater than 99.5, carry out vacuum melting in a vacuum induction furnace under the condition of vacuum degree <50Pa, and heat until the alloy raw materials are completely melted and the surface of the molten pool After no bubbles escape, heat it at 1600°C for 1 hour under the protection of argon to refine and fully alloy, then cast and cool at room temperature to obtain a steel ingot.

[0048] Step 2, homogenization treatment: the steel ingot prepared in step 1 was placed in a heating furnace, kept at a constant temperature of 1200° C. for 30 minutes, and cooled to room temperature with the furnace to obtain a homogenized steel ingot.

[0049] Step 3, forging treatment: the steel ingot ...

Embodiment 2

[0055] The present embodiment provides a kind of preparation method of Nb-containing low-density steel for automobile, specifically comprises the following steps:

[0056] Step 1, smelting: according to the mass percentage corresponding to 2# steel in Table 1. Weigh raw materials with a purity greater than 99.5, conduct vacuum melting in a vacuum induction furnace under the condition of a vacuum degree of <50Pa, heat until the alloy raw materials are completely melted and no bubbles overflow from the surface of the molten pool, then keep warm for 1 hour at 1600°C under the protection of argon for refining and fully alloyed, then cast and cooled at room temperature to obtain a steel ingot.

[0057] Step 2, homogenization treatment: the steel ingot prepared in step 1 was placed in a heating furnace, kept at a constant temperature of 1200° C. for 30 minutes, and cooled to room temperature with the furnace to obtain a homogenized steel ingot.

[0058] Step 3, forging treatment: t...

Embodiment 3

[0064] The present embodiment provides a kind of preparation method of Nb-containing low-density steel for automobile, specifically comprises the following steps:

[0065] Step 1, smelting: according to the mass percentage corresponding to 3# steel in Table 1. Weigh raw materials with a purity greater than 99.5, conduct vacuum melting in a vacuum induction furnace under the condition of a vacuum degree of <50Pa, heat until the alloy raw materials are completely melted and no bubbles overflow from the surface of the molten pool, then keep warm for 1 hour at 1600°C under the protection of argon for refining and fully alloyed, then cast and cooled at room temperature to obtain a steel ingot.

[0066] Step 2, homogenization treatment: the steel ingot prepared in step 1 was placed in a heating furnace, kept at a constant temperature of 1200° C. for 30 minutes, and cooled to room temperature with the furnace to obtain a homogenized steel ingot.

[0067] Step 3, forging treatment: t...

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Abstract

The invention discloses Nb-contained high-strength high-tenacity low-density steel for an automobile and a preparation method of the Nb-contained high-strength high-tenacity low-density steel for theautomobile, and relates to the field of metal materials. The Nb-contained high-strength high-tenacity low-density steel for the automobile comprise, by mass percentage, 0.9% to 1.1% of C, 9.4% to 9.7%of Al, 26.9% to 28.1% of Mn, 0.08% to 0.50% of Nb, smaller than 0.5% of Si, smaller than 0.004% of S, smaller than 0.003% of P, and the balance Fe and other inevitable impurity elements. According tothe Nb-contained high-strength high-tenacity low-density steel for the automobile, a finely dispersed NbC phase is precipitated by adding the Nb element to traditional Fe-Mn- Al-C low-density steel,the NbC phase and kappa-carbide jointly generate a precipitation strengthening effect, and then the high-strength high-tenacity low-density steel excellent in corrosion resistance is obtained, whereinaccording to the high-strength high-tenacity low-density steel excellent in corrosion resistance, the density is between 6.4 g/cm<3> - 6.7 g/cm<3>, the tensile strength is between 980 MPa and 1200 MPa, and the elongation percentage after fracture is between 20% and 50%, and the corrosion potential is larger than minus 0.462V. The Nb-contained high-strength high-tenacity low-density steel is suitable for automobile steel demands, can achieve lightweight of the automobile and meets the development concept of energy saving and emission reduction.

Description

technical field [0001] The invention relates to the field of metal materials, more specifically to a kind of Nb-containing high-strength, high-toughness and low-density steel for automobiles and a preparation method thereof. Background technique [0002] At present, automobile lightweight has become an important measure to improve fuel efficiency and reduce pollution. The lightweight of automobiles is mainly achieved in two ways. One is to reduce the weight of automobile steel, that is, to use low-density magnesium or aluminum alloys instead of traditional steel to prepare automobile shells and parts. The second is to use high-strength steel to replace traditional steel. Reduce the thickness of the steel plate to reduce the weight of the car. However, magnesium and aluminum alloys have low strength, high preparation cost, complex forming process, and poor welding performance, which limit their development and use in automotive load-bearing parts, and reducing the thickness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C33/04C21D1/26C21D8/02
CPCC21D1/26C21D8/0226C21D8/0236C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 李运刚马涛李慧蓉高建新宋宏伟李欣程玉杰王哲
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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