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Effect of Grain Size on Mechanical Properties of Dual Phase SteelsComposed of Ferrite and Martensite

Published online by Cambridge University Press:  28 March 2016

Myeong-heom Park ,
Akinobu Shibata  and
Nobuhiro Tsuji
Myeong-heom Park*
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-Ku, Kyoto, 606-8501, Japan
Akinobu Shibata
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-Ku, Kyoto, 606-8501, Japan Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
Nobuhiro Tsuji
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-Ku, Kyoto, 606-8501, Japan Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
*
*(Email: alchemist302@gmail.com)
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Abstract

It is well-known that dual phase (DP) steels composed of ferrite and martensitehave good ductility and plasticity as well as high strength. Due to theirexcellent mechanical properties, DP steels are widely used in the industrialfield. The mechanical properties of DP steels strongly depend on several factorssuch as fraction, distribution and grain size of each phase. In this study, thegrain size effect on mechanical properties of DP steels was investigated. Inorder to obtain DP structures with different grain sizes, intercritical heattreatment in ferrite + austenite two-phase region was carried out forferrite-pearlite structures having coarse and fine ferrite grain sizes. Theseferrite-pearlite structures with coarse and fine grains were fabricated by twotypes of heat treatments; austenitizing heat treatment and repetitive heattreatment. Ferrite grain sizes of the specimens heat-treated by austenitizingand repetitive heat treatment were 47.5 µm (coarse grain) and 4.5µm (fine grain), respectively. The ferrite grain sizes in the final DPstructures fabricated from the coarse-grained and fine-grained ferrite-pearlitestructures were 58.3 µm and 4.1µm, respectively. Themechanical behavior of the DP structures with different grain sizes wasevaluated by an uniaxial tensile test at room temperature. The local straindistribution in the specimens during tensile test was obtained by a digitalimage correlation (DIC) technique. Results of the tensile test showed that thefine-grained DP structure had higher strength and larger elongation than thecoarse-grained DP structure. It was found by the DIC analysis that thefine-grained DP structure showed homogeneous deformation compared with thecoarse-grained DP structure.

Keywords

steelstress/strain relationshipmicrostructure

Information

Type
Articles
Information
MRS Advances , Volume 1 , Issue 12: Mechanical Behavior and Failure of Materials , 2016 , pp. 811 - 816
Copyright
Copyright © Materials Research Society 2016 

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