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A kind of low-density fe-mn-al-c hot-rolled q&p steel and its manufacturing method

A fe-mn-al-c, manufacturing method technology, applied in low-density Fe-Mn-Al-C hot-rolled Q&P steel and its manufacturing field, can solve the problem of difficulty in obtaining uniformity and post-break elongation, difficulty in low-temperature quenching control, Problems such as uneven structure and performance, to achieve the effect of solving uneven cooling, improving surface quality, and accurate final cooling temperature

Active Publication Date: 2020-11-27
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing hot-rolled Q&P research relies heavily on online rapid cooling, and the control of low-temperature quenching is difficult, resulting in problems such as poor plate shape and uneven structure and properties, which restrict its further industrial application.
In addition, the retained austenite content in the Q&P structure obtained by most current studies is low, generally less than 15%, making it difficult to obtain good uniformity and elongation after fracture for high-strength (greater than 1100MPa) Q&P structures

Method used

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  • A kind of low-density fe-mn-al-c hot-rolled q&p steel and its manufacturing method
  • A kind of low-density fe-mn-al-c hot-rolled q&p steel and its manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0035] In this embodiment, the composition of the low-density Fe-Mn-Al-C hot-rolled Q&P steel is: C: 0.23%, Mn: 3.0%, Al: 1.8%, and the rest is Fe.

[0036] After smelting and forging, the billet is heated to 1200°C and kept for 1.5 hours. The first-stage rolling is carried out at 1190°C, and then the second-stage rolling is carried out by air cooling to 920°C. The final rolling temperature is 880°C, air-cooled to 340°C, and then slowly cooled to room temperature with the furnace.

[0037] Its performance indicators are as follows after mechanical performance testing: the yield strength is 660MPa, the tensile strength is 1135MPa, the elongation after fracture is 19.20%, and the strong-plastic product is 21.790GPa.%. Such as figure 1 As shown, the metallographic structure is composed of ferrite, martensite and retained austenite, the volume fraction of ferrite is 14%, the volume fraction of retained austenite is 23.25%, and the rest is martensite. Such as figure 2 As shown,...

Embodiment 2

[0039] In this embodiment, the composition of the low-density Fe-Mn-Al-C hot-rolled Q&P steel is: C: 0.25%, Mn: 2.8%, Al: 2.0%, and the rest is Fe.

[0040] After smelting and forging, the billet is heated to 1200°C and kept for 1.5 hours. The first-stage rolling is carried out at 1180°C, and then the second-stage rolling is carried out by air cooling to 925°C. The final rolling temperature is 870°C, air-cooled to 320°C, and then slowly cooled to room temperature with the furnace.

[0041]Its performance indicators are as follows after mechanical performance testing: the yield strength is 630MPa, the tensile strength is 1151MPa, the elongation after fracture is 20.5%, and the strong-plastic product is 23.595GPa.%. The metallographic structure is composed of ferrite, martensite and retained austenite. The volume fraction of ferrite is 14%, the volume fraction of retained austenite is 21.92%, and the rest is martensite. Such as figure 2 As shown, it can be seen from the XRD d...

Embodiment 3

[0043] In this embodiment, the composition of the low-density Fe-Mn-Al-C hot-rolled Q&P steel is: C: 0.24%, Mn: 2.9%, Al: 2.2%, and the rest is Fe.

[0044] After smelting and forging, the billet is heated to 1210°C and kept for 1.5 hours. Carry out the first stage rolling at 1170°C, then air cool to 930°C for the second stage rolling, the final rolling temperature is 890°C, air cool to 300°C, and then slowly cool to room temperature with the furnace.

[0045] Its performance indicators are as follows after mechanical performance testing: the yield strength is 653MPa, the tensile strength is 1161MPa, the elongation after fracture is 19.20%, and the strong-plastic product is 22.290GPa.%. The metallographic structure is composed of ferrite, martensite and retained austenite. The volume fraction of ferrite is 13%, the volume fraction of retained austenite is 24.16%, and the rest is martensite. Such as figure 2 As shown, it can be seen from the XRD detection that there are seve...

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Abstract

The invention belongs to the technical field of steel alloy materials, and specifically relates to a low-density Fe-Mn-Al-C hot-rolled Q&P steel and its manufacturing method. The chemical composition of low-density hot-rolled Q&P steel is: 0.22 to 0.25% C, 2.8 to 3.2% Mn, 1.8 to 2.2% Al, and the balance is Fe. After controlled rolling, the experimental steel was air-cooled online to 280-340°C, and then furnace-cooled to room temperature. Finally, a complex Q&P structure with a small amount of ferrite, martensite and retained austenite was obtained, with a tensile strength of ≥1135MPa and an elongation of >19%. Compared with existing Q&P steel, the present invention reduces the density of experimental steel through reasonable composition design, and weakens the dependence of martensite transformation on cooling rate. It replaces the quenching process with air cooling and overcomes the problems caused by online low-temperature quenching (below Ms). Problems such as uneven structural properties and poor plate shape.

Description

technical field [0001] The invention belongs to the technical field of iron and steel alloy materials, and in particular relates to a low-density Fe-Mn-Al-C hot-rolled Q&P steel and a manufacturing method thereof. Background technique [0002] With the increasingly prominent contradiction between energy, environment and sustainable development, the automotive industry is developing towards energy saving, consumption reduction, low carbon, environmental protection and green, which poses new challenges to automotive materials. Lightweight and safety are important indicators to measure automotive materials, so it is particularly important to design and develop low-density high-strength plastic materials. In addition, iron and steel enterprises are facing severe situations such as overcapacity, unbalanced product structure, and high energy consumption, and there is an urgent need to develop high-quality green steel materials with reduction processes. [0003] Quenching-partitio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C21D8/02C22C33/04
CPCC21D8/0226C21D8/0263C22C33/04C22C38/04C22C38/06
Inventor 袁国李云杰康健毛起佳王晓晖李振垒王国栋
Owner NORTHEASTERN UNIV LIAONING
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