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Precipitation of TiS in Al–Ti Simultaneously Deoxidized Steel
Author(s) -
Jin Pengliang,
Shang Deli,
Wang Guocheng,
Xiao Yuanyou,
Cao Lei
Publication year - 2021
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.202000614
Subject(s) - materials science , precipitation , metallurgy , liquid steel , oxide , composite number , composite material , physics , meteorology
Herein, the precipitation of TiS in an Al–Ti simultaneously deoxidized steel is observed, and the results confirm the precipitation of single TiS, two‐layered oxide (Al 2 O 3 or TiO x )–TiS composite, and three‐layered Al 2 O 3 –TiO x –TiS composite inclusions in the steel. Thermodynamic calculations reveal that TiS precipitated in the experimental steel during the solidification process when the solid fraction ( x s ) is 0.880. In addition, the precipitation of TiO x during solidification depends on the equilibrium partition of O. When the O content in steel is very low, TiS rather than TiO x is precipitated. In addition, the enrichment of O in the residual liquid steel results in the precipitation of TiO x during the solidification process. Oxide–TiS is formed by TiS precipitation on the surface of Al 2 O 3 and TiO x precipitation in the liquid steel or at the initial stage of solidification. However, Al 2 O 3 –TiS is formed only in preformed solid steel with low oxygen content. The lattice misfit results suggest that it is easier to match TiS to TiO and TiO 2 , while the misfit of TiS(001)/bcc Fe(100) is 6.06.