Inclusion Modification in Si-Mn Killed Steels using Titanium Addition

Abstract

Modification of inclusions by titanium (Ti) additions in low-alloyed Si-Mn killed steels was studied. Formation of the modified inclusions was studied by measuring the inclusion count and chemistry. Mn-Si-Al-S-O based inclusions were observed in the steel, after Si-Mn de-oxidation, to which ferro-titanium (FeTi) additions were made. Thermochemical software (FactSage) was used to study the equilibrium between steel and inclusions and subsequent modification due to Ti addition. Inclusion counts and chemistry in the steel were measured at different time intervals after the FeTi additions. MnO-SiO2 inclusions transformed to TiO2-MnO-SiO2 based inclusions with Ti replacing both Mn and Si in the inclusions. Si removal was more prominent from the inclusions compared to Mn. When more FeTi was added to the steel the inclusions further decreased in their Mn and Si content. With further FeTi addition Ti based inclusions with Al and Mn content less than 10% and Si content less than 5% were formed. MnS inclusions were also observed in the steel and formed as a result of segregation during solidification.

Department(s)

Materials Science and Engineering

Publication Status

Open Access

Keywords and Phrases

Ferro-titanium addition; Inclusion modification; Thermodynamic modeling

International Standard Serial Number (ISSN)

0915-1559

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2024 Learned Society, All rights reserved.

Publication Date

01 Jan 2015

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