Metall. Res. Technol.
Volume 116, Number 5, 2019
Inclusion cleanliness in the metallic alloys
|Number of page(s)||8|
|Published online||09 August 2019|
Industrial experiment study on inclusion evolution in 95CrMo Steel
School of Materials and Metallurgy, Guizhou University, Guiyang,
550025, PR China
2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
3 School of Materials & Metallurgical Engineering, Guizhou Institute of Technology, Guiyang, Guizhou 550003, PR China
4 School of Metallurgical and Ecological Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, PR China
Accepted: 19 March 2019
In order to clarify the evolution mechanism of inclusions in 95CrMo, the industrial experiments were conducted. The composition, morphology and size of inclusions during refining and solidifying processes were analyzed by SEM-EDS detection and thermodynamic calculations. The inclusion evolution during refining process in molten 95CrMo steel can be concluded as: Al2O3 → Al2O3-MgO-CaO/CaS → Al2O3-MgO-SiO2-CaO-CaS, which is affected by slag-metal reaction and corrosion of refractory. The change of inclusion size during refining was analyzed based on their collision and floatation behavior. The composition of inclusions in billets indicate that there were mainly five types of inclusions, including spinel with sharp angle, spherical oxide inclusion composed of Al2O3, MgO, SiO2 and CaO, oxide-sulfide inclusion with single phase, inclusion with duplex phase, and MnS inclusion. The type of inclusions affects their size. The thermodynamic results indicate that most complex oxides formed in molten steel and no spinel generated during cooling process. CaS formed in the molten steel after tundish metallurgy and there were still some CaS precipitated in solid steel. MnS precipitated after steel solidification. The calculated results based on FACTSAGE 7.1 are in agreement with experimental results on the whole.
Key words: inclusion evolution / size / oxide / thermodynamic
© EDP Sciences, 2019
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