Study of the Oxide Inclusions in Fe-Ti and Fe-V Alloys

Abstract

Deoxidation products in Fe-Ti alloys were investigated. It was determined that inclusions formed varied their structure to liquid oxide (it's structure is spinel 2FeO.TiO₂ or ilmenite FeO·TiO₂), solid solution of Ti₃O₅ and FeO·2TiO₂ and Ti₂O₃ with an increase of the amounts of titanium added.
Isothermal phase diagram of Fe-Ti-O ternary system at 1500° was established and the following results were obtained.
1) Pseudobrookite and anasovite can form pseudobinary system and they are able to dissolve completely each other.
2) Ti₂O₃ is able to equilibrate with the metallic phase containing titanium up to 27% and this fact agrees with the result of deoxidation products.
As for deoxidation products of vanadium, it was verified that they appear as spinel FeO, V₂O₃, V₂0₃ and VO with an increase of the amounts of vanadium added. Moreover, FeO - V₂O₃ changes an amounts of wustite dissolved owing to oxygen partial pressure equilibrated.