(PS179)Composition and Morphology of Si-Mn-Ti Deoxidation Products in Steel at 1550°C and at the Solid-Liquid Metal Phase Coexistence Temperature

摘要

Ti-based oxide inclusions precipitated with MnS have been found to be effective in promoting the nucleation of an acicular ferrite microstructure, which is known to provide optimum combination of properties in steel. Wakoh et al. and Kim et al. previously reported that Mn-Ti or Si-Mn-Ti based oxides are effective for the precipitation of MnS, especially in slowly cooled samples.1'2' In this study, the behavior of oxide and sulfide inclusions in Si-Mn-Ti deoxidized steel samples heated using a specially designed heat treatment method, targeted at the solid-liquid metal phase coexistence temperature, was investigated.