Aluminum, titanium and oxygen control during electroslag remelting of stainless steel based on thermodynamic analysis

• Published in: Journal of iron and steel research, international Vol. 26; no. 1; pp. 20 - 31
• Main Authors: Hou, Dong, Jiang, Zhou-hua, Qu, Tian-peng, Wang, De-yong, Liu, Fu-bin, Li, Hua-bing
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.01.2019
• Subjects: Applied and Technical Physics; Engineering; Machines; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; Original Paper; Physical Chemistry; Processes; Titanium control; Stainless steel; Oxygen control; Thermodynamic analysis; Electroslag remelting; Aluminum control; Ion and molecule coexistence theory
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1007/s42243-018-0107-2

Experimental investigation and thermodynamic calculation were carried out to study the effect of slag on alloying elements during electroslag remelting with developing a thermodynamic model to control titanium and aluminum in ingot. The thermodynamic model based on ion and molecule coexistence theory and conservation law of element atoms was established to analyze the change in aluminum and titanium along the height of ingot. The results show that low CaO slag is suitable for electroslag remelting of metal containing high titanium-to-aluminum ratio. As electroslag remelting process consists of slag temperature-rising and temperature-stable periods, TiO 2 should be added into water-cooled copper mold during temperature-rising period in order to keep the thermodynamic equilibrium between titanium and aluminum, and the amount of TiO 2 is the difference value calculated by the reaction between titanium and alumina at 1477 and 1677 °C.