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
CN110205459AActive Publication Date: 2019-09-06CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHONGQING UNIV
Publication Date
2019-09-06

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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.
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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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