Method for improving strength of Fe-Mn-Al-C series low-density steel

A fe-mn-al-c, low-density steel technology, which is applied in the field of improving the strength of Fe-Mn-Al-C series low-density steel, can solve the problems of further improvement, improvement, and time-consuming problems that are difficult to further improve performance.

Active Publication Date: 2021-06-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, aging treatment often takes a lot of time, for example, it usually takes 5 hours or even longer to reach a higher strength level, which is obviously not conducive to the improvement of production efficiency
In addition, due to long-term aging, κ-carbides and other second phases such as β-Mn may also be formed at the grain boundaries, which are very detrimental to tensile properties.
That is to say, it is difficult to achieve further improvement in performance by simply adjusting κ-carbides to enhance precipitation strengthening.

Method used

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  • Method for improving strength of Fe-Mn-Al-C series low-density steel
  • Method for improving strength of Fe-Mn-Al-C series low-density steel

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Effect test

Embodiment 1

[0029] A method for improving the strength of Fe-Mn-Al-C series low-density steel, the steps of the method are as follows:

[0030] (1) The Fe-Mn-Al-C steel piece corresponding to No. 1 in Table 1 is subjected to a solution treatment of soaking and heat preservation for 1 hour at 950°C to obtain the Fe-Mn-Al-C steel after solution treatment ;

[0031] (2) The Fe-Mn-Al-C series steel after the solution treatment is rolled out of the furnace, the downforce is 60%, and the final rolling temperature is 550 ° C. After the rolling is completed, it is immediately quenched into water and cooled to room temperature to obtain Fe-Mn-Al-C series steel after rolling;

[0032] (3) The rolled Fe-Mn-Al-C steel is subjected to aging treatment at 600°C for 2 hours, and after the aging treatment is completed, it is cooled to room temperature in the air to obtain a low-density and high-strength Fe-Mn- Al-C series steel blank.

[0033] The OM test results of the Fe-Mn-Al-C series steel after th...

Embodiment 2

[0036] A method for improving the strength of Fe-Mn-Al-C series low-density steel, the steps of the method are as follows:

[0037] (1) The Fe-Mn-Al-C series steel corresponding to No. 2 in Table 1 is subjected to a solution treatment of soaking and heat preservation for 3 hours at 950° C. to obtain the Fe-Mn-Al-C series steel after the solution treatment;

[0038] (2) The Fe-Mn-Al-C series steel after the solution treatment is rolled out of the furnace, the downdraft is 40%, the final rolling temperature is 650 ° C, and immediately quenched into water to cool to room temperature after rolling, to obtain Fe-Mn-Al-C series steel after rolling;

[0039] (3) The rolled Fe-Mn-Al-C steel is aged at 550°C for 1 hour, and then cooled to room temperature in air to obtain a low-density, high-strength Fe-Mn-Al- C series steel blank.

[0040] The OM test results of the Fe-Mn-Al-C series steel after the solution treatment and the OM test results of the rolled Fe-Mn-Al-C series steel sho...

Embodiment 3

[0043] A method for improving the strength of Fe-Mn-Al-C series low-density steel, the steps of the method are as follows:

[0044] (1) The Fe-Mn-Al-C series steel corresponding to No. 3 in Table 1 is subjected to solution treatment by soaking at 1100°C for 2 hours to obtain the Fe-Mn-Al-C series steel after solution treatment ;

[0045] (2) The Fe-Mn-Al-C series steel after the solution treatment is rolled out of the furnace, the downdraft is 50%, and the final rolling temperature is 700 ° C. After the rolling is completed, it is immediately quenched into water and cooled to room temperature to obtain Fe-Mn-Al-C series steel after rolling;

[0046](3) The rolled Fe-Mn-Al-C steel is aged at 550°C for 2 hours, and then cooled to room temperature in the air to obtain a low-density high-strength Fe-Mn-Al- C series steel blank.

[0047] The OM test results of the Fe-Mn-Al-C series steel after the solution treatment and the OM test results of the rolled Fe-Mn-Al-C series steel s...

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Abstract

The invention relates to a method for improving the strength of Fe-Mn-Al-C series low-density steel, and belongs to the technical field of metal materials. The method comprises the steps that firstly, a Fe-Mn-Al-C series steel part is subjected to solution treatment and then subjected to rolling deformation treatment, wherein the rolling reduction ranges from 20% to 70%, and the finish rolling temperature ranges from 500 DEG C to 850 DEG C; and finally, heat preservation is conducted for 0.5-3 h at the temperature of 350-600 DEG C, aging treatment is conducted, and after aging treatment is finished, the steel is cooled to room temperature in air to obtain the low-density high-strength Fe-Mn-Al-C series steel. The yield strength of the Fe-Mn-Al-C series low-density high-strength steel obtained through the method reaches 1370-1900 MPa, the ultrahigh strength level is achieved, and meanwhile the ductility is kept to be 8% or above.

Description

technical field [0001] The invention relates to a method for improving the strength of Fe-Mn-Al-C series low-density steel, which belongs to the technical field of metal materials. Background technique [0002] For improved fuel efficiency and reduced CO 2 Emissions and body weight reduction have become important trends in the development of the automotive industry. Fe-Mn-Al-C steel is considered to be one of the most potential steels that can be used to realize the weight reduction of car body due to its excellent strength-plasticity matching and low density characteristics. At present, the tensile strength of this kind of steel can generally reach the level of 800-1300MPa, and the density (<7g / cm 3 ) is more than 10% lower than traditional steel, showing great application prospects. [0003] In the prior art, the heat treatment process of Fe-Mn-Al-C low-density high-strength steel is generally solid solution + aging treatment, the purpose of which is to first form a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D6/00C21D1/18C22C38/38C22C38/06C22C38/22C22C38/26C22C38/28C22C38/02C22C38/32B21B3/00B21B37/00B21B37/74
CPCC21D8/005C21D6/002C21D6/005C21D6/008C21D1/18C22C38/38C22C38/06C22C38/22C22C38/26C22C38/28C22C38/02C22C38/32B21B3/00B21B37/00B21B37/74B21B2003/001
Inventor 李壮王迎春程兴旺高冲李宗远李树奎
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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