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In‐Situ Observation of the Formation of MnS during Solidification of High Sulphur Steels
Author(s) -
Valdez Martin Emiliano,
Wang Yan,
Sridhar Seetharaman
Publication year - 2004
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.200405952
Subject(s) - eutectic system , materials science , metallurgy , isothermal process , precipitation , lamella (surface anatomy) , confocal laser scanning microscopy , in situ , sulfur , optical microscope , composite material , scanning electron microscope , microstructure , thermodynamics , chemistry , medicine , physics , organic chemistry , meteorology , biomedical engineering
A Confocal Scanning Laser Microscope equipped with a gold image furnace was used to directly observe the precipitation of MnS during solidification of high sulphur steels under isothermal conditions in the temperature region 1440 to 1480°C on the free surface of the steel melt. For the case of Al‐killed steels, below 1480°C MnS particles were found to precipitate with Fe forming simultaneously around them. This MnS containing structure continued to grow rapidly (264 μm/s) as a surface film. The film gradually changed, as the level of S in the melt decreased, into a eutectic structure (with lamella spacing of 2 μm) as predicted by thermodynamics. In Si‐ killed steels there was significantly lower tendency to form MnS both in terms of time until precipitation occurred and growth rate.