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10.3390/ma17194933
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Article

Influence of Annealing and Aging Parameters on the Microstructure and Properties of 1200 MPa Grade Cold-Rolled Dual-Phase Steel

by
Xiaoyue Ma
1,2,
Xiaohong Chu
1,2,
Yuebiao Yang
3,
Hongzhou Lu
4,
Wenjun Wang
4 and
Zhengzhi Zhao
1,2,*
1
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Beijing Engineering Technology Research Center of Special Steel for Traffic and Energy, University of Science and Technology Beijing, Beijing 100083, China
3
Guangxi Liuzhou Iron and Steel Group Co., Ltd., Liuzhou 545002, China
4
CITIC Metal Co., Ltd., Beijing 100004, China
*
Author to whom correspondence should be addressed.
Materials 2024, 17(19), 4933; https://doi.org/10.3390/ma17194933
Submission received: 10 August 2024 / Revised: 28 September 2024 / Accepted: 2 October 2024 / Published: 9 October 2024
(This article belongs to the Special Issue Physical Metallurgy of Metals and Alloys (3rd Edition))
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Abstract

With the rapid development of the automotive industry, the requirements for bodywork materials are not only focused on high strength but also on improved forming properties. To develop a new generation of automotive steels with higher strength–plasticity matching, a high elongation 1200 MPa grade V-Nb microalloyed cold-rolled reinforced formable dual-phase steel was developed in this experiment through rational compositional design and precise process machining. The properties of the test steel are improved by varying the over-aging temperature as well as the annealing temperature to achieve a good strength–plasticity balance. The results show that as the aging temperature increases, the tensile strength and yield strength of the test steel decrease, while the elongation continues to increase. At an aging temperature of 310 °C, the steel exhibits not only high strength but also better ductility. As the annealing temperature increases, the tensile strength and yield strength of the test steel initially increase and then decrease, while the elongation continues to increase. When the heat treatment process involves an annealing temperature of 860 °C and an over-aging temperature of 310 °C, the test steel achieves the best strength–plasticity balance.
Keywords: cold-rolled dual-phase steels with high formability; microalloying; annealing temperature; over-aging temperature; fracture behavior cold-rolled dual-phase steels with high formability; microalloying; annealing temperature; over-aging temperature; fracture behavior

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MDPI and ACS Style

Ma, X.; Chu, X.; Yang, Y.; Lu, H.; Wang, W.; Zhao, Z. Influence of Annealing and Aging Parameters on the Microstructure and Properties of 1200 MPa Grade Cold-Rolled Dual-Phase Steel. Materials 2024, 17, 4933. https://doi.org/10.3390/ma17194933

AMA Style

Ma X, Chu X, Yang Y, Lu H, Wang W, Zhao Z. Influence of Annealing and Aging Parameters on the Microstructure and Properties of 1200 MPa Grade Cold-Rolled Dual-Phase Steel. Materials. 2024; 17(19):4933. https://doi.org/10.3390/ma17194933

Chicago/Turabian Style

Ma, Xiaoyue, Xiaohong Chu, Yuebiao Yang, Hongzhou Lu, Wenjun Wang, and Zhengzhi Zhao. 2024. "Influence of Annealing and Aging Parameters on the Microstructure and Properties of 1200 MPa Grade Cold-Rolled Dual-Phase Steel" Materials 17, no. 19: 4933. https://doi.org/10.3390/ma17194933

APA Style

Ma, X., Chu, X., Yang, Y., Lu, H., Wang, W., & Zhao, Z. (2024). Influence of Annealing and Aging Parameters on the Microstructure and Properties of 1200 MPa Grade Cold-Rolled Dual-Phase Steel. Materials, 17(19), 4933. https://doi.org/10.3390/ma17194933

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