Search for dissertations about: "Johan Björkvall"

Found 5 swedish dissertations containing the words Johan Björkvall.

2. 1. Slag/Metal Metallurgy in Iron and Steel Melts

   Author : Johan Ekengård; Pär Jönsson; Attila Dioszegi; Johan Björkvall; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; austenit; syreaktivitet; slagg; fördelning; primär dendrit; metalldroppar; lamellär grafit; svavel; kompaktgrafit; skänk; nodulär grafit; raffinering; Metallurgical process science; Metallurgisk processvetenskap;

   Abstract : In this work, the metal and slag phase mixing in three steps of a ladle refining operation of steel melts and for an oxygen balance during cooling of cast iron melts have been studied at two Swedish steel plants and at two Swedish cast iron foundries, respectively. In order to predict the oxygen activity in the steel bulk in equilibrium with the top slag as well as in metal droplets in the top slag in equilibrium with the top slag, three slag models were used. READ MORE

4. 2. Thermodynamic study of multicomponent slags

   Author : Johan Björkvall; KTH; []
   Keywords : ;

   Abstract : .... READ MORE

5. 3. Thermodynamic study of silicate and aluminate melts : a model approach

   Author : Johan Björkvall; KTH; []
   Keywords : ;

   Abstract : .... READ MORE

6. 4. Slag, Steel, Ladle and Non-metallic Inclusions Equilibria in an ASEA-SKF Ladle Furnace

   Author : Kamrooz Riyahimalayeri; Malin Selleby; Johan Björkvall; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Clean steel; Top slag; Non-Metallic Inclusions; Oxides; Vacuum Degassing; Deoxidation; Desulphurization; Equilibrium; Computational Thermodynamics; Scanning electron microscopy;

   Abstract : This study explores the possibility of prediction and modification of some of the physicochemical properties of non-metallic inclusions by considering top slag-steel-ladle equilibria in an ASEA-SKF ladle furnace. To test the reliability of an available computational thermodynamic computer program, the first sub project was done. READ MORE

7. 5. The Submerged Entry Nozzle : A Study of how to Reduce Decarburization and Clogging

   Author : Jennie Svensson; Pär Jönsson; Voicu Brabie; Johan Björkvall; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials Science and Engineering; Teknisk materialvetenskap; Steel Forming and Surface Engineering;

   Abstract : During continuous casting the submerged entry nozzle (SEN) is one of the critical points. This since sequence casting is favourable, clogging of the SEN results in fever sequences or aborted castings. In this study the preheating of SEN has been evaluated at different steel plants. READ MORE