Formation and Thermodynamics of Mg-Al-Ti-O Complex Inclusions in Mg-Al-Ti-Deoxidized Steel

Abstract

The formation of Mg-Al-Ti-O complex inclusions in steel was investigated by laboratory experiments and thermodynamic calculation. The composition evolutions of Mg-Al-Ti-O inclusions in steel with different contents of [Al], [Mg], and [Ti] were discussed. Mg-Al-Ti-O complex inclusion with high TiO x content was liquid at 1873 K (1600°C), indicating MgAl 2 O 4 spinel inclusions can be modified to low melting temperature ones by combining TiO x component. The stability diagram of Al-Mg-Ti-O system inclusions in the molten steel at 1873 K (1600°C) was calculated, considering many kinds of oxide inclusions such as , and liquid inclusion. The thermodynamic calculations are in good agreement with experimental results, which can predict the formation of Al-Mg-Ti-O complex inclusions in molten steel with a large concentration range of [Al], [Mg], and [Ti].

Formation, Evolution and Removal of MgO·Al₂O₃ Spinel Inclusions in Steel

“…In fact, other dissolved elements e.g. Ti [28][29][30][31] and Mn, 10) are also possible to influence the evolution of spinel inclusions during refining process. Also, rare earth (RE) treatment was recently considered by some researchers [32][33][34] as well.…”

Effect of processing at the steel vacuum processing unit (SVPU) on desulfurization of unmodified and modified KP-2 steel

“…The problem of increase the quality of wheels for railway cars is very important [3]. Among the works devoted this subject, it can be isolated [4,5].…”

Evolution Mechanism of Inclusions in Al-killed, Ti-bearing 11Cr Stainless Steel with Ca Treatment

“…The presence of titanium in Al-killed molten steel generally causes more severe clogging of the submerged entry nozzle than Ti-free steel, and the titanium oxide inclusions have been suggested as a possible cause. [26][27][28] Thus, many studies of nonmetallic inclusions in Al-killed Ti-bearing steel have been carried out, such as nozzle clogging behavior, 26,28) thermodynamics and characteristics of inclusions, [29][30][31][32][33][34][35][36][37][38][39][40] modification of inclusions with Ca treatment [41][42][43][44][45][46][47] or Mg treatment [48][49][50][51][52] and evolution of inclusion during solidification and heating. 41,48,[53][54][55] The two-layered inclusions of the Al-Ti-O phase with core Al 2 O 3 were observed in Al-killed Ti-bearing molten steel, which was identical to the inclusions causing the nozzle clogging.…”