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Heat treatment process for improving mechanical property of Fe-Mn-Al-C dual-phase steel by utilizing gamma-to-alpha allotropy transformation

A fe-mn-al-c, allotrope technology, applied in the heat treatment process for improving the mechanical properties of low-density and high-strength cold-rolled steel sheets, low-density and high-strength cold-rolled steel and its heat treatment process, high-aluminum lightweight steel In the field of its heat treatment process, it can solve the problems of restricting the addition of aluminum elements, reducing the mechanical properties of steel plates, and difficult to produce TRIP or TWIP effects, and achieve the effects of optimizing quality, increasing solid solution, and improving the coordination of two-phase deformation.

Active Publication Date: 2019-04-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase of Al element content in dual-phase light steel, the stacking fault energy of austenite will be greatly increased, making it difficult for the TRIP or TWIP effect to occur during the strain process. The deformation mechanism is mainly based on dislocation slip, and the mechanical properties of the steel plate reduced performance
Therefore, the addition of aluminum in dual-phase lightweight steel is restricted, which poses a challenge to the development of lower-density automotive steel sheets

Method used

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  • Heat treatment process for improving mechanical property of Fe-Mn-Al-C dual-phase steel by utilizing gamma-to-alpha allotropy transformation
  • Heat treatment process for improving mechanical property of Fe-Mn-Al-C dual-phase steel by utilizing gamma-to-alpha allotropy transformation
  • Heat treatment process for improving mechanical property of Fe-Mn-Al-C dual-phase steel by utilizing gamma-to-alpha allotropy transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, a kind of Fe-Mn-Al-C dual-phase steel, its composition by mass percentage is: C: 0.80%, Mn: 15.0%, Al: 8.50%, Si: 1.50%, balance is Fe Elements and unavoidable impurity elements, Fe-Mn-Al-C dual-phase steel is austenite and ferrite structure. The Fe-Mn-Al-C dual phase steel in this embodiment is an austenite matrix dual phase steel.

[0042] In this example, see figure 1 , a heat treatment process that uses γ→α isotropic transformation to improve the mechanical properties of Fe-Mn-Al-C dual-phase steel, so that γ→α isotropic transformation occurs at the austenite grain boundary of Fe-Mn-Al-C steel Prime isomerization transformation, prepares Fe-Mn-Al-C dual-phase steel, comprises the steps:

[0043] a. Hot rolling Fe-Mn-Al-C steel, wherein the composition of Fe-Mn-Al-C steel is: C: 0.80%, Mn: 15.0%, Al: 8.50%, Si: 1.50% , the balance is Fe element and unavoidable impurity elements; use vacuum induction smelting furnace to smelt to obtain 82mm ingo...

Embodiment 2

[0051] This embodiment is basically the same as Embodiment 1, especially in that:

[0052] In this embodiment, a kind of Fe-Mn-Al-C dual-phase steel, its composition by mass percentage is: C: 0.30%, Mn: 15.00%, Al: 10.00%, the balance is Fe element and unavoidable Impurity elements, Fe-Mn-Al-C dual-phase steel is austenite and ferrite structure. The Fe-Mn-Al-C dual phase steel in this embodiment is a ferrite matrix dual phase steel.

[0053] In this example, see figure 1 , a heat treatment process that uses γ→α isotropic transformation to improve the mechanical properties of Fe-Mn-Al-C dual-phase steel, so that γ→α isotropic transformation occurs at the austenite grain boundary of Fe-Mn-Al-C steel Prime isomerization transformation, prepares Fe-Mn-Al-C dual-phase steel, comprises the steps:

[0054] a. The Fe-Mn-Al-C steel is hot-rolled, wherein the composition of the Fe-Mn-Al-C steel is: C: 0.30%, Mn: 15.00%, Al: 10.00%, and the balance is Fe Elements and unavoidable impu...

Embodiment 3

[0062] This embodiment is basically the same as the previous embodiment, and the special features are:

[0063] In this embodiment, a kind of Fe-Mn-Al-C dual-phase steel, its composition by mass percentage is: C: 0.8%, Mn: 15.0%, Al: 7.00%, Si: 3.00%, balance is Fe Elements and unavoidable impurity elements, Fe-Mn-Al-C dual-phase steel is austenite and ferrite structure. The Fe-Mn-Al-C dual phase steel in this embodiment is an austenite matrix dual phase steel.

[0064] In this example, see figure 1 , a heat treatment process that uses γ→α isotropic transformation to improve the mechanical properties of Fe-Mn-Al-C dual-phase steel, so that γ→α isotropic transformation occurs at the austenite grain boundary of Fe-Mn-Al-C steel Prime isomerization transformation, prepares Fe-Mn-Al-C dual-phase steel, comprises the steps:

[0065]a. Hot rolling the Fe-Mn-Al-C steel, wherein the composition of the Fe-Mn-Al-C steel is: C: 0.80%, Mn: 15.00%, Al: 7.00%, Si: 3.00% , the balance is...

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Abstract

The invention discloses a heat treatment process for improving the mechanical property of Fe-Mn-Al-C dual-phase steel by utilizing gamma-to-alpha allotropy transformation, and belongs to the technicalfield of automobile steel. The heat treatment process is characterized in that steel is heated to 1273-1373 K after undergoes hot rolling, the temperature is kept for 30 min-1 h, then water cooling is performed to enable to the temperature to reach the room temperature, then cold rolling treatment is performed, the cold deformation amount is 50-80%; the two-phase region temperature is selected for annealing treatment on a cold-rolled steel plate, the annealing temperature is not higher than the heat preservation temperature before cold rolling, and the annealing time is 10 s-5 min; a two-phase structure with transformation of gamma to alpha occurred at the austenite grain boundary is obtained through the heat treatment process, the gamma-phase orientation and the alpha-phase orientation meet the K-S relationship, meanwhile, the solid solution amount of the C in the austenite is increased, and the yield strength and the toughness of the steel are improved; the process is the heat treatment process for improving the strength and plasticity of the dual-phase steel at the same time, and the quality of the Fe-Mn-Al-C double-phase high-aluminum light steel is comprehensively optimized and improved.

Description

technical field [0001] The present invention relates to a low-density high-strength cold-rolled steel and its heat treatment process, in particular to a high-aluminum light steel and its heat treatment process, and also to a heat treatment process for improving the mechanical properties of low-density high-strength cold-rolled steel sheets. Applied in the field of automotive steel lightweight technology. Background technique [0002] Under the global consensus of energy saving, emission reduction and pollution reduction, automobile manufacturers are paying more and more attention to the use of low-density and high-strength automobile steel plates to reduce the weight of the car body, so as to reduce carbon emissions and save energy. Weight reduction is the main driving force for the development of Fe-Mn-Al-C steels for automotive applications, with a lower density than Fe (7.8 g / cm 3 ) alloy elements, such as Al (2.7g / cm 3 ), Si (2.3g / cm 3 ), Mn (7.21g / cm 3 ) are usually...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C38/04C22C38/02C21D1/18C21D1/26C21D6/00C21D8/02
CPCC21D1/18C21D1/26C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0236C21D2211/001C21D2211/005C22C38/02C22C38/04C22C38/06
Inventor 史文王白冰刘营凯
Owner SHANGHAI UNIV
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