Premium
Formation Mechanism of Complex Oxide Inclusions in 55SiCr Spring Steels
Author(s) -
Liu Yang,
Zhang Ying,
Zhang Lifeng,
Ren Ying,
Shen Ping,
Luo Yan
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.201700277
Subject(s) - oxide , materials science , metallurgy , inclusion (mineral) , wetting , liquid steel , composite material , mineralogy , chemistry
In the current study, formation mechanism of complex oxide inclusions in spring steels is studied. The complex oxides are extracted from steel samples with different methods, including two‐dimensional observation on a polished cross section of steel samples, acid etching, and non‐aqueous solution electrolytic extraction to reveal the three‐dimensional morphology of inclusions. Most of the oxide inclusions are characterized as MgO or MgO · Al 2 O 3 in a core covered with liquid components. Thermodynamic calculation is performed using Factsage 7.0 software. Both MgO, MgO · Al 2 O 3 solid inclusions, and liquid inclusions are observed in the molten steel. Based on the wettability between the molten steel, solid MgO inclusions, and liquid inclusions, a mechanism for the formation of complex oxides is suggested, that is, the solid core is wrapped by liquid inclusions in the molten steel.