Application and assessment of aluminium deoxidation equilibria in liquid steel using various formalisms based on some statistical thermodynamic models

ABSTRACT

Aluminium, is being added to liquid steel in a wide concentration range. Wagner's interaction parameter formalism (WIPF) has been successfully used to fit the experimental data reported by several researchers at 1873 K in a low Al content range, however, a huge variation was observed beyond a few wt.% of Al. In the present work, to calculate Al-O equilibria, besides (i) WIPF, (ii) Lupis and Elliot's formalism has been recalculated and (iii) Unified interaction parameter formalism (UIPF) has been developed for the first time on a wt.% scale. Thermodynamic analysis has also been carried out to account for short range order in Fe-Al-O system using (iv) associate model while (v) modified quasi-chemical model (MQM) is summarized from the literature. The present thermodynamic analysis assesses the suitability of various formalisms based on regular and quasichemical model for a wide Al concentration range in liquid steel.

KEYWORDS:

• Deoxidation
• interaction parameters
• aluminium
• WIPF
• UIPF
• associate model

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The financial support for this study is provided by (1) Industrial Research and Consultancy Center (IRCC) IIT Bombay, Mumbai and (2) Science and Engineering Research Board (SERB), Department of Science and Technology, Government of India.