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| Effect of Strengthening Phase on Deformation Behaviour during Uniaxial Tension of Hot-rolled Dual Phase Steel |
| Le-yu ZHOU1,Bo JIANG1,Tian-hao CUI1,Dan ZHANG1,Jian-zhong HE2,Ya-zheng LIU1 |
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China
2. Technology Center, Baotou Iron & Steel Group Co. , Ltd. , Baotou 014010, Inner Mongolia, China |
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Abstract Two kinds of C-Si-Mn-Cr series tested steels were designed to obtain dual phase microstructures of ferrite (F)+martensite (M) or ferrite (F)+bainite (B) with different mechanical properties. Effects of strengthening phase on yielding and fracture behaviours during uniaxial tension of dual phase steel were discussed. Compared with hot-rolled martensite dual phase steel, ferrite-bainite dual phase steel has high ratio of yield strength to tensile strength (YS/TS) and low elongation. During necking process of uniaxial tension, microvoids of ferrite-martensite steel are generated by fracture of ferrite/martensite boundary or martensite islands with irregular shape. But ferrite matrix elongated remarkably along deformation direction, and strengthening phase also coordinated with ferrite matrix. Compatible deformation between ferrite and bainite is distinct. Ferrite-bainite dual phase steel has fine and less microvoid, and phase boundary of ferrite and bainite is beneficial for restraining generation and extending of microvoid.
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Received: 20 June 2014
Published: 04 December 2014
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| Fund:Beijing Higher Education Young Elite Teacher Project;Fundamental Research Funds for the Central Universities of China |
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Corresponding Authors:
ZHOU Le-Yu
E-mail: zhouleyu@ustb.edu.cn
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2014, Vol. 21 
