Q-and-P organized hot rolled Fe-Mn-Al-C steel obtained by quenching to bainite zone and manufacturing method

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

Active Publication Date: 2019-04-02
NORTHEASTERN UNIV
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  • 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

Method used

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  • Q-and-P organized hot rolled Fe-Mn-Al-C steel obtained by quenching to bainite zone and manufacturing method
  • Q-and-P organized hot rolled Fe-Mn-Al-C steel obtained by quenching to bainite zone 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, in particular to Q-and-P organized hot rolled Fe-Mn-Al-C steel obtained by quenching to a bainite zone and a manufacturing method. The hot rolled Fe-Mn-Al-C steel is prepared from the chemical components in percentage by weight: 0.22%-0.25% of C, 2.8%-3.2% of Mn, 1.8%-2.2% of Al, and the balance of Fe. The phase change dynamicsis controlled by composition design, experimental steel is cooled above an Ms temperature, sufficient bainite phase change is avoided when the steel is cooled slowly afterwards, and a structure withmartensite/bainite being as a matrix is obtained. The experimental steel is air-cooled to 500-550 DEG C after controlled rolling is carried out, then furnace cooling is carried out to the room temperature, finally, a complex phase Q-and-P structure of a small amount of ferrite, martensite/bainite and retained austenite is obtained, the tensile strength is more than 1050MPa, and the elongation is more than 20%. Thus, the difficult problem of low temperature quenching of the Q-and-P steel is not prone to controlling 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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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
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