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Effects of Coincident Site Lattice Grain Boundaries and Ordered Structures on Mechanical Properties of High Silicon Steel
Author(s) -
Cai Guojun,
Huang Yanru
Publication year - 2019
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.201800430
Subject(s) - materials science , grain boundary , lattice (music) , dislocation , electrical steel , silicon , composite material , cleavage (geology) , homogeneous , metallurgy , crystallography , fracture (geology) , condensed matter physics , microstructure , physics , chemistry , acoustics , thermodynamics
The coincident site lattice (CSL) grain boundaries and ordered structures of high silicon steel are investigated through different warm rolling reductions. The results reveal that the plastic deformation ability of Fe–6.9 wt%Si warm‐rolled sheet mainly depends on the total content of special ∑CSL boundaries and antiphase domain of ordered structures. With the increase of rolling reductions from 65% to 86%, the superdislocation glide behavior of warm‐rolled sheets is changed into the single dislocation glide, as well as the fragmentation behavior of ordered structures at different rolling reductions causes a decrease in the sizes of antiphase domains. While the sharp and homogeneous distribution of γ ‐orientation texture is beneficial to obtain a large fraction of ∑CSL boundaries that have great contribute to high resistance to the initiation and propagation of cracks. In the three‐point bending tests, the values of fracture deflection improves from 3.5 mm to 12.1 mm, and the mixed fracture mode of inter‐and trans‐granular is transformed into quasi‐cleavage fracture mode, which indicates the high rolling reduction is conducive to the improvement of plastic deformation ability.