Effect of continuous annealing process on microstructure and properties of 780 MPa cold-rolled dual phase steel with high formability

ZHOU Li; JIAO Mingmu; XUE Renjie; ZHAO Xin; WANG Zhuo

doi:10.7513/j.issn.1004-7638.2025.01.027

Volume 46 Issue 1

Feb. 2025

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ZHOU Li, JIAO Mingmu, XUE Renjie, ZHAO Xin, WANG Zhuo. Effect of continuous annealing process on microstructure and properties of 780 MPa cold-rolled dual phase steel with high formability[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(1): 192-197. doi: 10.7513/j.issn.1004-7638.2025.01.027

Citation:

ZHOU Li, JIAO Mingmu, XUE Renjie, ZHAO Xin, WANG Zhuo. Effect of continuous annealing process on microstructure and properties of 780 MPa cold-rolled dual phase steel with high formability[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(1): 192-197. doi: 10.7513/j.issn.1004-7638.2025.01.027

Citation:

ZHOU Li, JIAO Mingmu, XUE Renjie, ZHAO Xin, WANG Zhuo. Effect of continuous annealing process on microstructure and properties of 780 MPa cold-rolled dual phase steel with high formability[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(1): 192-197. doi: 10.7513/j.issn.1004-7638.2025.01.027

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Effect of continuous annealing process on microstructure and properties of 780 MPa cold-rolled dual phase steel with high formability

doi: 10.7513/j.issn.1004-7638.2025.01.027

ZHOU Li^{1, 2
,},
JIAO Mingmu³,
XUE Renjie^{4
,
,},
ZHAO Xin³,
WANG Zhuo⁴

1.
School of Rare Earth Industry, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
2.
School of Electrical Engineering, Chongqing Industry Polytechnic College, Chongqing 401120, China
3.
Handan Vocational College of Science and Technology, Handan 056046, Hebei, China
4.
HBIS Materials Technology Research Institute, Shijiazhuang 052165, Hebei, China

Received Date: 2024-04-12
Publish Date: 2025-02-27

Abstract

Abstract

A low-cost 780 MPa grade cold-rolled dual phase steel with high formability was designed and developed based on the equipment characteristics of the production line, and the effects of continuous annealing on the microstructure and properties of the cold rolled products were studied. The results show that under different annealing conditions, the microstructure of the experimental steel is mainly composed of ferrite, dispersed bainite, martensite, and a small amount of M/A islands. Increasing the end temperature of rapid cooling can increase the retained austenite content, with the highest content of retained austenite reaching 3.9%. The retained austenite is mostly distributed in the form of thin films or blocks at the interface between B/F and F/F or B/M phases, and the retained austenite exerts the TRIP effect to achieve plasticity improvement.
- dual phase steel,
- annealing process,
- retained austenite,
- TRIP effect,
- mechanical property

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References(20)

References

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