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Heat treatment method of Fe-Mn-Al-C austenitic low-density steel

A heat treatment method and technology for low-density steel, applied in the field of heat treatment of iron-manganese-aluminum-carbon austenitic low-density steel, can solve problems such as the influence of the safety of steel use and the reduction of work hardening ability, so as to improve the safety of use and yield. The effect of strength improvement and yield strength improvement

Active Publication Date: 2019-09-06
CHONGQING UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problem that the strength of the heat treatment method in the prior art is improved but the work hardening ability is reduced after the steel is processed, which leads to the problem that the safety of the steel is affected. Method for mechanical properties of manganese-aluminum-carbon austenitic low-density steel

Method used

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  • Heat treatment method of Fe-Mn-Al-C austenitic low-density steel

Examples

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Embodiment 1

[0031] Fe-30Mn-11Al-1.2C austenitic low-density steel after solution treatment at 1100°C for 1 h was used. The steel is subjected to traditional 450°C / 1h aging treatment, room temperature and air cooling.

[0032] (1) According to figure 1 In the deformation heat treatment process shown, the aged steel is pre-stretched and deformed, and the tensile strain rate is 10 -3 ·s -1 , the total strain is 20%.

[0033] (2) After the steel stretched in (1) is subjected to a single-stage aging treatment at 600°C / 10min, it is air-cooled at room temperature.

[0034] The low-density steel that this example obtains is carried out room temperature mechanical property test, and the result is as follows figure 2 As shown in Table 1, the yield strength is 1125MPa, the tensile strength is 1214MPa, the uniform elongation is 17.8%, and the total elongation is 25.0%.

[0035] From comparative examples 1 and 2 and embodiment 1, it can be seen that comparative example 1 adopts the traditional a...

Embodiment 2

[0039] Fe-30Mn-11Al-1.2C austenitic low-density steel after solution treatment at 1100°C for 1 h was used.

[0040] (1) According to figure 1 In the deformation heat treatment process shown, the steel is subjected to pre-rolling deformation, the deformation amount of each pass is 5%, and the total deformation amount is 20%.

[0041] (2) The pre-rolled steel is subjected to bipolar aging treatment. First, the steel is subjected to primary aging treatment at 450°C / 1h, and then rapidly (15°C / min) is heated to a secondary aging temperature of 600°C, and secondary aging treatment is performed at 600°C / 30min.

[0042] The low-density steel obtained in this example was tested for mechanical properties at room temperature. The results are shown in Table 1. The yield strength is 1206MPa, the tensile strength is 1300MPa, the uniform elongation is 18.2%, and the total elongation is 33.4%.

Embodiment 3

[0044] Fe-30Mn-11Al-1.2C austenitic low-density steel after solution treatment at 1100°C for 1 h was used.

[0045] (1) According to figure 1 In the deformation heat treatment process shown, the steel is subjected to pre-rolling deformation, the deformation amount of each pass is 5%, and the total deformation amount is 20%.

[0046] (2) The pre-rolled steel is subjected to unipolar aging treatment. The pre-rolled steel was subjected to a single-stage aging treatment at 600°C / 40min, and air-cooled at room temperature.

[0047] The low-density steel obtained in this example was tested for mechanical properties at room temperature, and the results are shown in Table 1. The yield strength is 1154MPa, the tensile strength is 1268MPa, the uniform elongation is 17.9%, and the total elongation is 31.3%.

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Abstract

The invention discloses a heat treatment method of a Fe-Mn-Al-C austenitic low-density steel. The heat treatment method comprises the following steps that (1), the pre-deformation treatment is carriedout on the Fe-Mn-Al-C austenitic low-density steel in the initial state, and the total strain capacity is controlled to be 4%-35%; and (2), the aging treatment is carried out on the Fe-Mn-Al-C austenitic low-density steel subjected to pre-deformation treatment, specifically, the aging treatment is one-step aging treatment or two-step aging treatment, wherein the one-step aging temperature is 600-700 DEG C, the heat preservation time is 10-60 min, and the cooling at room temperature is carried out; and the two-step aging is characterized in that the first-step aging temperature is 450-550 DEGC, the heat preservation time of the first-step aging is 0.5-4h, and after the completion of the first-step aging, the second-step aging temperature is reached through the rapid warming, the second-step aging temperature is 600-700 DEG C, the heat preservation time of the second-step aging is 10-40 min, and then the cooling at room temperature is carried out. According to the heat treatment method, the yield ratio of the Fe-Mn-Al-C austenitic low-density steel can be reduced, the use safety performance of the Fe-Mn-Al-C austenitic low-density steel is improved, and excellent comprehensive mechanical properties are obtained; and the method has important significance in practical application.

Description

technical field [0001] The invention relates to the field of heat treatment of metal materials, in particular to a heat treatment method for iron-manganese-aluminum-carbon-based austenitic low-density steel. Background technique [0002] In the development of automobile lightweight, with the increase of low-density non-ferrous alloys (such as: aluminum alloy, magnesium alloy, composite materials, etc.) . Iron-manganese-aluminum-carbon (Fe-Mn-Al-C) austenitic low-density steel has the characteristics of high strength, high plasticity and low density. Therefore, a series of researches on replacing traditional Cr and Ni stainless steels since the 1950s Then came a new upsurge. [0003] As the content of alloying elements increases, the stacking fault energy of the material increases, which suppresses the mechanisms of phase transformation-induced plasticity and twinning-induced plasticity, and transforms the deformation mechanism into planar slip. In iron-manganese-aluminu...

Claims

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Application Information

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IPC IPC(8): C21D8/00
CPCC21D8/005C21D2211/001
Inventor 陈兴品任平梅霖聂盈盈周云霄曹文全刘庆
Owner CHONGQING UNIV
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