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Metals 2017, 7(8), 316; doi:10.3390/met7080316

Study on Microstructure and Properties of Bimodal Structured Ultrafine-Grained Ferrite Steel

1,2
,
1,2,* , 2
,
2
and
1,2
1
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Received: 24 June 2017 / Revised: 3 August 2017 / Accepted: 16 August 2017 / Published: 18 August 2017
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Abstract

The objective of the study research was to obtain bimodal structured ultrafine-grained ferrite steel with outstanding mechanical properties and excellent corrosion resistance. The bimodal microstructure was fabricated by the cold rolling and annealing process of a dual-phase steel. The influences of the annealing process on microstructure evolution and the mechanical properties of the cold-rolled dual-phase steel were investigated. The effect of bimodal microstructure on corrosion resistance was also studied. The results showed that the bimodal characteristic of ferrite steel was most apparent in cold-rolled samples annealed at 650 °C for 40 min. More importantly, due to the coordinated action of fine-grained strengthening, back-stress strengthening, and precipitation strengthening, the yield strength (517 MPa) of the bimodal microstructure improved significantly, while the total elongation remained at a high level of 26%. The results of corrosion experiments showed that the corrosion resistance of bimodal ferrite steel was better than that of dual-phase steel with the same composition. This was mainly because the Volta potential difference of bimodal ferrite steel was smaller than that of dual-phase steel, which was conducive to forming a protective rust layer. View Full-Text
Keywords: bimodal ferrite steel; ultrafine-grained microstructure; mechanical properties; corrosion resistance bimodal ferrite steel; ultrafine-grained microstructure; mechanical properties; corrosion resistance
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Niu, G.; Wu, H.; Zhang, D.; Gong, N.; Tang, D. Study on Microstructure and Properties of Bimodal Structured Ultrafine-Grained Ferrite Steel. Metals 2017, 7, 316.

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