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The Formation Mechanism of Mn–Al–O Inclusions in Fe–Cr–Mn Stainless Steel during Continuous Casting
Author(s) -
Li Jingyu,
Cheng Guoguang,
Li Liuyi,
Hu Bin,
Xu Changsong,
Wang Guimin
Publication year - 2018
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.201700461
Subject(s) - continuous casting , materials science , metallurgy , inclusion (mineral) , slab , scanning electron microscope , casting , non metallic inclusions , energy dispersive x ray spectroscopy , microstructure , composite material , mineralogy , chemistry , geology , geophysics
The formation mechanism of Mn–Al–O inclusions in Fe–Cr–Mn stainless steel during continuous casting is investigated by industrial trials and thermodynamic calculation. The morphology, composition, and size distribution of inclusions in steel specimens are analyzed by scanning electron microscopy and energy dispersive spectroscopy. The main inclusions change from spherical Ca–Si–O and Ca–Si–Mn–O inclusions during LF refining to Mn–Al–O inclusions in continuous casting slab and hot‐rolled sheet. The size of most Mn–Al–O inclusions containing high MnO content is smaller than 4 µm. The formation of these inclusions is consistent with thermodynamic calculation, which indicates that MnO and Al 2 O 3 inclusions are formed during continuous casting process. The calculation results of MnO and Al 2 O 3 inclusions growth shown that the size of MnO inclusion (4 µm) is much larger than that of Al 2 O 3 inclusion (0.4 µm) at the end of solidification, which also accords with the characteristics of inclusions in continuous casting slab and hot‐rolled sheet.