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Open AccessArticle

Microstructure and Mechanical Properties of a Cold-Rolled Ultrafine-Grained Dual-Phase Steel

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Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, China
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State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China
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State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
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School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
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School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China
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Authors to whom correspondence should be addressed.
Materials 2018, 11(8), 1399; https://doi.org/10.3390/ma11081399
Received: 10 June 2018 / Revised: 4 August 2018 / Accepted: 6 August 2018 / Published: 10 August 2018
A new processing route to produce Ultrafine-Grained Dual-Phase steel has been proposed, involving cold-rolling and subsequent intercritical annealing of a fibrous ferrite–martensite starting structure. Ultrafine-grained DP (UFG-DP) steel with an average ferrite grain size of about ~2.7 μm and an average martensite island size of ~2.9 μm was achieved. Tensile testing revealed superior mechanical properties (the ultimate tensile strength of 1267 MPa and uniform elongation of 8.2%) for the new DP steel in comparison with the fibrous DP steels. The superior mechanical properties are attributed to the influence of microstructure refinement on the work-hardening and fracture behavior. View Full-Text
Keywords: dual phase steel; cold-rolling; intercritical annealing; microstructure refinement dual phase steel; cold-rolling; intercritical annealing; microstructure refinement
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MDPI and ACS Style

Pan, Z.; Gao, B.; Lai, Q.; Chen, X.; Cao, Y.; Liu, M.; Zhou, H. Microstructure and Mechanical Properties of a Cold-Rolled Ultrafine-Grained Dual-Phase Steel. Materials 2018, 11, 1399.

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