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Pinning Effect of Oxide Particles on Grain Boundaries of a Low Aluminum Non‐oriented Electrical Steel
Author(s) -
Ren Qiang,
Zhang Lifeng,
Yang Wen
Publication year - 2020
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.201900303
Subject(s) - materials science , grain boundary , oxide , elongation , electrical steel , zener pinning , metallurgy , aluminium , grain size , chemical composition , composite material , pinning force , microstructure , condensed matter physics , superconductivity , thermodynamics , ultimate tensile strength , critical current , physics
In this article the pinning effect of oxide particles on grain boundaries of a low aluminum non‐oriented electrical steel is studied. According to their locations and morphologies in annealed steel samples, oxide particles are classified into three types: globular ones at grain boundaries, globular ones in the interior of grains, and chain‐like ones pinning at grain boundaries. The chemical composition of oxide particles shows a significant influence on the probability pinning at grain boundaries. The elongation ratio of oxide particles becomes larger with the decrease in their viscosity that is determined by the chemical composition and temperature and is calculated using FactSage. Based on the thermodynamic analysis, small particles forming during solidification have more content of SiO 2 due to the reaction between the dissolved oxygen and silicon in the steel. Particles of large size and large elongation ratio show larger pinning force on the grain growth. Removing large SiO 2 –Al 2 O 3 –MnO–CaO particles as far as possible, and controlling the composition of oxide particles to achieve larger viscosity than the steel matrix, will retard their elongation during the hot‐rolling process so that the magnetic properties of the steel are improved.