Effects of Si on microstructural evolution and mechanical properties of hot-rolled ferrite and bainite dual-phase steels

Cai, Ming-hui, Ding, Hua, Lee, Young-kook, Tang, Zheng-you and Zhang, Jian-su 2011, Effects of Si on microstructural evolution and mechanical properties of hot-rolled ferrite and bainite dual-phase steels, ISIJ International, vol. 51, no. 3, pp. 476-481.

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Title Effects of Si on microstructural evolution and mechanical properties of hot-rolled ferrite and bainite dual-phase steels
Author(s) Cai, Ming-hui
Ding, Hua
Lee, Young-kook
Tang, Zheng-you
Zhang, Jian-su
Journal name ISIJ International
Volume number 51
Issue number 3
Start page 476
End page 481
Total pages 6
Publisher Iron and Steel Institute of Japan
Place of publication Tokyo, Japan
Publication date 2011
ISSN 0915-1559
1347-5460
Keyword(s) ferrite and bainite dual-phase steel
impact toughness
Si content
strain hardening rate
stretch-flangeability
Summary Based on the thermo-mechanical controlled process, the effects of Si on microstructural evolution, tensile properties, impact toughness, and stretch-flangeability of ferrite and bainite dual-phase (FBDP) steels were systematically investigated. The addition of Si from 0 to 0.95% promoted the formation of fine and equiaxed ferrite grains, and high Si (0.95%) also resulted in the formation of blocky martensite islands and retained austenite. Yield and tensile strengths, and uniform and total elongations all increased with increasing Si content. Therefore, the tensile strength and ductility balance was improved by Si addition due to the increasing strain-hardening rate. The fractured morphologies after hole-expansion showed that the excellent stretch-flangeability of FBDP steels was associated with the micro-cracks propagating through in ferrite phase as well as the elongated ferrite grains along the direction perpendicular to the crack. 0.95% Si steel had a similar high combination of tensile strength and impact toughness to 0.55% Si steel, and especially 0.95% Si steel exhibited an excellent combination of tensile strength and stretch-flangeability.
Language eng
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2011, ISIJ
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047967

Document type: Journal Article
Collection: Institute for Frontier Materials
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