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Microstructure Evolution of a New Dual‐Phase Steel via Multi‐Pass Compression Deformation in the ( α + γ ) Region
Author(s) -
Zhang Chunling,
Kong Yuting,
Zhang Mengmeng,
Yang Jinfeng,
Cai Dayong
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201400526
Subject(s) - materials science , ferrite (magnet) , microstructure , bainite , metallurgy , dynamic recrystallization , martensite , deformation bands , dual phase steel , deformation (meteorology) , recrystallization (geology) , grain size , composite material , strain partitioning , hot working , geology , paleontology , tectonics
Grain refinement provides an effective way to improve the strength of low‐carbon steel without loss of room temperature ductility. The microstructure evolution of Cu–P–Cr–Ni–Mo weathering steel during multi‐pass deformation was investigated via hot compression simulation. The results indicated that ultrafine ferrite grains of 1.8 μm can be obtained in the ( α + γ ) region at multi‐pass deformation conditions. The second phase of bainite and martensite was distributed as band form on the ferrite matrix and became thinner with increasing number of passes. The microstructural analysis results showed that at the initial pass deformation, strain‐enhanced ferrite transformation is the main mechanism for structure refinement and at the later pass deformation, continuously dynamic recrystallization of ferrite is the main mechanism for ferrite grain refinement.