Keywords and Phrases
Automated inclusion analysis
"Centrifugal casting provides the opportunity of combining large centrifugal forces and directional solidification to reduce non-metallic inclusions in the cast steel product. Calcium treatment in the ladle has the potential of reducing and modifying non-metallic inclusions to achieve better machinability and mechanical properties. The objective of this research is to analyze the combined effects of calcium wire ladle treatment and centrifugal casting on the number, size, composition and morphology of non-metallic inclusions in centrifugally cast steel products.
All experiments were completed at an industrial foundry. The experiments involved feeding calcium wire into the ladle after argon oxygen decarburization (AOD) and prior to centrifugal casting. Samples were collected throughout the ladle treatment process and from the centrifugally cast products. Inclusions analysis was performed using an ASPEX automated inclusion analyzer. Charpy impact testing was performed after heat treatment to evaluate the relationship between toughness and non-metallic inclusions on the centrifugally cast products.
It was found that the efficiency of calcium wire fed just prior to casting was slightly higher than calcium fed at earlier stages of the ladle treatment (just after AOD), providing better Ca-reactions with the melt. Alumina (Al2O3) inclusions were transformed into low melting point calcium aluminates (12CaO•7Al2O3 and CaO•Al2O3), but the cleanliness of the centrifugally cast products depended more on the centrifugal forces applied to the system than on the calcium wire ladle treatment"--Abstract, page iii.
Peaslee, Kent D., 1956-2013
Lekakh, S. N. (Semen Naumovich)
Materials Science and Engineering
M.S. in Metallurgical Engineering
Steel Founders' Society of America
Peaslee Steel Manufacturing Research Center
Missouri University of Science and Technology
xv, 88 pages
© 2011 Edith Yolanda Martinez Silva, All rights reserved.
Thesis - Open Access
Calcium -- Thermal properties
Steel castings -- Testing
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Martinez Silva, Edith Yolanda, "Calcium wire ladle treatment to improve cleanliness of centrifugal cast steel" (2011). Masters Theses. 5125.