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Effect of Cooling Rate on the Microstructure of Proeutectoid Ferrite under a High Magnetic Field in Fe‐0.52C
Author(s) -
Wang S. J.,
Zhao X.,
Xiao N.,
Zuo L.
Publication year - 2010
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.201000076
Subject(s) - materials science , ferrite (magnet) , beta ferrite , acicular ferrite , austenite , metallurgy , acicular , magnetic field , alloy , microstructure , condensed matter physics , composite material , bainite , physics , quantum mechanics
For steels, cooling rate is a key factor affecting and deciding the morphology, amount, size and distribution of proeutectoid phase during cooling after austenitizing. In this study, the influence of cooling rate on the formation of proeutectoid ferrite in a high purity Fe‐0.52C alloy during transformation from austenite to ferrite under a high magnetic field was investigated. Results showed that the high magnetic field of 12 T can significantly change the morphology and distribution of proeutectoid ferrite. As compared with the specimens transformed without applying a magnetic field, the proeutectoid ferrite grains were elongated and aligned along the field direction, and only small amounts of acicular proeutectoid Widmanstätten ferrite were observed. The amount of acicular proeutectoid Widmanstätten ferrite in the specimens transformed under the magnetic field increased with increasing cooling rate. The reasons for the observed phenomena were discussed on the basis of free energy, interfacial energy and elastic strain energy of the involved phases transformed under the high magnetic field.