Microstructure, Properties and Work Hardening Behavior of High Strength Cold Rolled Dual-Phase Steel

Zheng Zhi Zhao; Zhi Gang Wang; Ai Min Zhao; Jie Yun Ye

doi:10.4028/www.scientific.net/AMR.399-401.1682

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 399-401Microstructure, Properties and Work Hardening...

Microstructure, Properties and Work Hardening Behavior of High Strength Cold Rolled Dual-Phase Steel

Abstract:

Two kinds of high strength cold rolled dual-phase steel with different Si content were trial-produced in the laboratory. Tensile strength and elongation of the two steels exceed 1000MPa and 15%, respectively. The phase transformation behaviors of both steels were compared and investigated in continuous cooling process by thermal dilatometer. The effects of Si on the mechanical properties and microstructures of dual-phase steel were studied by tensile testing, OM and SEM observation. The results show that the two phase region (α+γ) is enlarged, the precipitation and growth of pro-eutectoid ferrite is promoted, and the morphology and distribution patterns of martensite are improved for high Si steel. Both steels show two-stage strain hardening characteristics. StageⅠ (ε<0.05), the solution of Si hinder the movement of dislocations, make the work hardening exponent of high Si steel is higher than that low Si steel. At stage Ⅱ (ε>0.05), the compatibility and delivery between hard phase and soft phase eliminate the differences between the two steels.

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Periodical:

Advanced Materials Research (Volumes 399-401)

Pages:

1682-1686

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.399-401.1682

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Online since:

November 2011

Authors:

Zheng Zhi Zhao, Zhi Gang Wang, Ai Min Zhao, Jie Yun Ye

Keywords:

Dual Phase Steel, Microstructure, Property Analysis, Si, Work Hardening Behavior

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