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Hot-rolled fe-mn-al-c steel obtained by quenching to bainite zone to obtain q&p structure and manufacturing method

A fe-mn-al-c and manufacturing method technology, applied in the field of hot-rolled Fe-Mn-Al-C steel and manufacturing, can solve the problems of poor plate shape, uneven structure and properties, difficult low-temperature quenching control, etc. Effect of good control, improved surface quality, avoidance of differences in tissue properties and shape problems

Active Publication Date: 2020-12-04
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing hot-rolled Q&P research relies heavily on on-line rapid cooling and low-temperature quenching control is difficult, resulting in problems such as poor plate shape and uneven structure and properties, which restrict its further industrial application.

Method used

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  • Hot-rolled fe-mn-al-c steel obtained by quenching to bainite zone to obtain q&p structure and manufacturing method
  • Hot-rolled fe-mn-al-c steel obtained by quenching to bainite zone to obtain q&p structure and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, the composition of the hot-rolled Fe-Mn-Al-C steel quenched to the bainite zone to obtain the Q&P structure is: C: 0.25%, Mn: 2.9%, Al: 1.9%, 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 1180°C, and then the second-stage rolling is carried out by air cooling to 930°C. The final rolling temperature is 890°C, air-cooled to 505°C, and then slowly cooled to room temperature with the furnace.

[0037] Its performance indicators are as follows after mechanical performance testing: yield strength is 680MPa, tensile strength is 1095MPa, elongation after fracture is 20.4%, and strong-plastic product is 22.338GPa.%. Such as figure 1 As shown, the metallographic structure is composed of ferrite, martensite / bainite and retained austenite, the volume fraction of ferrite is 14%, the volume fraction of retained austenite is 27.3%, and the rest is martensite b...

Embodiment 2

[0039]In this example, the composition of the hot-rolled Fe-Mn-Al-C steel quenched to the bainite zone to obtain the Q&P structure is: C: 0.23%, Mn: 3.1%, 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. Carry out the first stage rolling at 1180°C, then air cool to 925°C for the second stage rolling, the final rolling temperature is 880°C, air cool to 530°C, and then slowly cool to room temperature with the furnace.

[0041] Its performance indicators are as follows after mechanical performance testing: yield strength is 670MPa, tensile strength is 1070MPa, elongation after fracture is 21.2%, and strong-plastic product is 22.684GPa.%. The metallographic structure is composed of ferrite, martensite / bainite and retained austenite, the volume fraction of ferrite is 15%, the volume fraction of retained austenite is 25.4%, and the rest is martensite / bainite body.

Embodiment 3

[0043] In this example, the composition of the hot-rolled Fe-Mn-Al-C steel quenched to the bainite zone to obtain the Q&P structure is: C: 0.24%, Mn: 3.0%, 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. The first-stage rolling is carried out at 1180°C, and then the second-stage rolling is carried out by air cooling to 930°C. The final rolling temperature is 890°C, air-cooled to 545°C, and then slowly cooled to room temperature with the furnace.

[0045] Its performance indicators are as follows after mechanical performance testing: yield strength is 665MPa, tensile strength is 1055MPa, elongation after fracture is 22.1%, and strong-plastic product is 23.315GPa.%. The metallographic structure is composed of ferrite, martensite / bainite and retained austenite, the volume fraction of ferrite is 15%, the volume fraction of retained austenite is 26.7%, and the rest is martensite / bainite body.

[0046] The r...

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Abstract

The invention belongs to the technical field of steel alloy materials, and specifically relates to a hot-rolled Fe-Mn-Al-C steel that is quenched to the bainite zone to obtain a Q&P structure and a manufacturing method. The chemical composition of hot-rolled Fe‑Mn‑Al‑C 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. By controlling the phase transformation kinetics through composition design, the experimental steel is cooled to above the Ms temperature, and then is slowly cooled to avoid sufficient bainitic phase transformation and obtain a martensite / bainite-based structure. After controlled rolling, the experimental steel was air-cooled online to 500-550°C, and then furnace cooled to room temperature. Finally, a complex Q&P structure with a small amount of ferrite, martensite / bainite, and retained austenite was obtained. The tensile strength was > 1050MPa, elongation >20%. Thus, the problem of low-temperature quenching of hot-rolled Q&P steel being difficult to control is solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel alloy materials, and in particular relates to a hot-rolled Fe-Mn-Al-C steel which is quenched to a bainite region to obtain a Q&P structure and a manufacturing method thereof. Background technique [0002] With the increasingly prominent energy and environmental issues, "low carbon, environmental protection, and green" has become the theme of the development of the times, posing new requirements and challenges for the development of the automobile industry. At present, all countries in the world have proposed new vehicle carbon dioxide emission indicators in 2020 and beyond, forcing the automotive industry to continuously innovate in the direction of new materials and new energy sources. In terms of automotive materials, light weight and safety are two important indicators to pursue. The application of advanced high-strength steel can thin the material, achieve the purpose of weight reducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/04C22C38/06
Inventor 袁国李云杰康健陈冬王晓晖李振垒王国栋
Owner NORTHEASTERN UNIV LIAONING
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