Premium
Formation Conditions of Ti 2 O 3 , MgTi 2 O 4 , Mg 2 TiO 4 , and MgAl 2 O 4 in Ti–Mg–Al Complex Deoxidation of Molten Iron
Author(s) -
Ono Hideki,
Nakajima Keiji,
Agawa Shingo,
Ibuta Toshio,
Maruo Ryota,
Usui Tateo
Publication year - 2015
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.201400034
Subject(s) - spinel , materials science , analytical chemistry (journal) , mineralogy , crystallography , metallurgy , chemistry , chromatography
The relationships of the compounds in the Mg–Ti–Al–O system in equilibrium with molten iron are investigated at temperatures ranging from 1873 to 1973 K, and the thermodynamic calculations are conducted in avoiding Al 2 O 3 or spinel MgAl 2 O 4 formation and for inclusion control. The equilibrium relations between the compounds (Mg 2 TiO 4 , MgTi 2 O 4 , or MgAl 2 O 4 ) and the composition of solutes in steel are clarified. The conditions are shown that the transformation of the stable compound from Mg–Ti spinel to Mg–Al spinel occurs at Mg contents ranging from 1 to 10 ppm by mass. It is also found, on the Mg–Ti spinel, the stable compound is transformed from inverse‐spinel Mg 2 TiO 4 to normal‐spinel MgTi 2 O 4 at Ti = about 60 ppm by mass. In addition, the stable compound is transformed from MgTi 2 O 4 to Ti 2 O 3 at Ti = about 1000 ppm by mass.