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Korean Journal of Metals and Materials > Volume 54(11); 2016 > Article
Korean Journal of Metals and Materials 2016;54(11): 808-816. doi: https://doi.org/10.3365/KJMM.2016.54.11.808
열연 590FB강의 일축인장 시 미소역학적 변형거동 및 파괴거동에 미치는 베이나이트의 강도계수의 영향
김은영1, 김성일2, 최시훈1,*
1순천대학교 인쇄전자공학과
2POSCO 기술연구소 박판연구그룹
Effect of Strength Coefficient of Bainite on Micromechanical Deformation and Failure Behaviors of Hot-Rolled 590FB Steel during Uniaxial Tension
Eun-Young Kim1, Sung Il Kim2, Shi-Hoon Choi1,*
1Department of Printed Electronics Engineering, Sunchon National University, Suncheon 57922, Republic of Korea
2Sheet Products & Process Research Group, POSCO Technical Research Laboratories, Gwangyang 57807, Republic of Korea
Correspondence  Shi-Hoon Choi ,Tel: +82-61-750-3556, Email: shihoon@sunchon.ac.kr
Received: 2 February 2016;  Accepted: 19 May 2016.  Published online: 5 November 2016.
ABSTRACT
The effect of the strength coefficient (KB) of bainite on micromechanical deformation and failure behaviors of a hot-rolled 590MPa steel (590FB) during uniaxial tension was simulated using the elasto-plastic finite element method (FEM). The spatial distribution of the constituent phases was obtained using a phase identification technique based on optical microstructure. Empirical equations which depend on chemical composition were used to determine the stress-strain relationship of the constituent phases of the 590FB steel. The stress-strain partitioning and failure behavior were analyzed by increasing the KB of bainite. The elasto-plastic FEM results revealed that effective strain in the ferrite-bainite boundaries, and maximum principal stress in fibrous bainite, were enhanced as the KB increased. The elasto-plastic FEM results also demonstrated that the KB significantly affects the micromechanical deformation and failure behaviors of the hot-rolled 590FB steel during uniaxial tension.
Keywords: ferrite-bainite dual phase steel, metals, deformation, fracture, optical microscopy
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