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

被引：16
作者：
Niu, Gang [1 ,2 ]
Wu, Huibin [1 ,2 ]
Zhang, Da [2 ]
Gong, Na [2 ]
Tang, Di [1 ,2 ]
机构：
[1] Univ Sci & Technol Beijing, Collaborat Innovat Ctr Steel Technol, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, Inst Engn Technol, Beijing 100083, Peoples R China
来源：
METALS | 2017年 / 7卷 / 08期
基金：
中国国家自然科学基金;
关键词：
bimodal ferrite steel; ultrafine-grained microstructure; mechanical properties; corrosion resistance; DUPLEX STAINLESS-STEEL; CORROSION BEHAVIOR; MECHANICAL-PROPERTIES; YIELD STRENGTH; ELECTROCHEMICAL IMPEDANCE; AUSTENITIC STAINLESS; INTERNAL-STRESSES; IF STEEL; SIZE; RESISTANCE;
D O I：
10.3390/met7080316
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 degrees 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.
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页数：13
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