ժҪ Mn-Ti oxides in Si-Mn-Ti deoxidized steels after cooling in the furnace were investigated. The composition and morphology of inclusions were analyzed by using FE-SEM with EDS. Mn-Ti oxides were found to be effective sites to induce intragranular ferrite formation. The thermodynamic calculation was employed to interpret the critical condition for Mn-Ti oxide formation. Mn-Ti oxide formation is controlled not only by [Mn], [Ti] content, but also by total oxygen in steel. When [Mn] and [Ti] were around 1.5 wt% and 0.005~0.01 wt% respectively, Mn-Ti oxide could form as total oxygen was 0.001~0.002 wt%. The experimental results are in good agreement with thermodynamic calculation results. Also MnS solubility was examined in Mn-Ti oxide inclusion system. With MnO content in Mn-Ti oxide increasing, MnS solubility in these oxides increased. High MnO content had an benefit on MnS precipitation in Mn-Ti oxide.
Abstract��Mn-Ti oxides in Si-Mn-Ti deoxidized steels after cooling in the furnace were investigated. The composition and morphology of inclusions were analyzed by using FE-SEM with EDS. Mn-Ti oxides were found to be effective sites to induce intragranular ferrite formation. The thermodynamic calculation was employed to interpret the critical condition for Mn-Ti oxide formation. Mn-Ti oxide formation is controlled not only by [Mn], [Ti] content, but also by total oxygen in steel. When [Mn] and [Ti] were around 1.5 wt% and 0.005~0.01 wt% respectively, Mn-Ti oxide could form as total oxygen was 0.001~0.002 wt%. The experimental results are in good agreement with thermodynamic calculation results. Also MnS solubility was examined in Mn-Ti oxide inclusion system. With MnO content in Mn-Ti oxide increasing, MnS solubility in these oxides increased. High MnO content had an benefit on MnS precipitation in Mn-Ti oxide.
Zhuo Xiao��Jun. Thermodynamic Calculation and MnS Solubility of Mn-Ti Oxide Formation in Si-Mn-Ti Deoxided Steel[J]. �й������ڿ���, 2010, 17(2): 10-16.
Zhuo Xiao��Jun. Thermodynamic Calculation and MnS Solubility of Mn-Ti Oxide Formation in Si-Mn-Ti Deoxided Steel. Chinese Journal of Iron and Steel, 2010, 17(2): 10-16.