100 t LF原精炼终渣(/%:53.8CaO,8.16MgO,16.6SiO_2,17.45Al_2O_3,1.44TFe,1.26S,R3.08)优化成终渣(/%:51.3CaO,6.36MgO,25.0SiO_2,6.73Al_2O_3,2.96TFe,0.76S,R2.05)后,通过降低碱度和渣中Al_2O_3含量,65Mn钢(/%:0.63~0.65C,0.19~0.22S...100 t LF原精炼终渣(/%:53.8CaO,8.16MgO,16.6SiO_2,17.45Al_2O_3,1.44TFe,1.26S,R3.08)优化成终渣(/%:51.3CaO,6.36MgO,25.0SiO_2,6.73Al_2O_3,2.96TFe,0.76S,R2.05)后,通过降低碱度和渣中Al_2O_3含量,65Mn钢(/%:0.63~0.65C,0.19~0.22Si,0.92~0.96Mn,0.005~0.006S,0.021~0.022P,0.003 5~0.0037T[O])中的夹杂物当量个数由18.4个/mm^2减少到11.3个/mm^2,其平均直径由8.4μm减小到4.5μm。相比原精炼渣系,采用优化渣系的65Mn在LF出站时的钢中Al_2O_3由5.9个/mm^2降低到1.7个/mm^2;其CaO-SiO_2-Al_2O_3和CaO-SiO_2-Al_2O_3-MgO复合夹杂物中Al_2O_3含量由38.3%~44.7%降低到17.5%~28.7%。B类Al_2O_3夹杂物不合格的卷数由6%降至3%。展开更多
The pulsed magneto-oscillation （PMO） technique has the potential to be applied in the production of heavy steel ingot. In order to confirm it and achieve more insights, the solidification of rectangular 65Mn steel i...The pulsed magneto-oscillation （PMO） technique has the potential to be applied in the production of heavy steel ingot. In order to confirm it and achieve more insights, the solidification of rectangular 65Mn steel ingot with the size of 220 mm×220 mm × 1000 mm was investigated under the impact of PMO. Experimental results present that PMO treatment can remarkably refine the solidified microstructure of 65Mn steel ingot in comparison with the reference ingot without PMO. The application of PMO not only significantly reduces the grain size, but also promotes the morphology transition of equiaxed grains from well-developed dendritic structures to globular structures. And the resulted globular morphology is mainly due to the fact that the PMO-induced forced flow enhances the stability of crystal growth. As a consequence, the average tensile strength of as-cast samples is enhanced from 643.4 to 762.9 MPa under the application of PMO.展开更多
文摘100 t LF原精炼终渣(/%:53.8CaO,8.16MgO,16.6SiO_2,17.45Al_2O_3,1.44TFe,1.26S,R3.08)优化成终渣(/%:51.3CaO,6.36MgO,25.0SiO_2,6.73Al_2O_3,2.96TFe,0.76S,R2.05)后,通过降低碱度和渣中Al_2O_3含量,65Mn钢(/%:0.63~0.65C,0.19~0.22Si,0.92~0.96Mn,0.005~0.006S,0.021~0.022P,0.003 5~0.0037T[O])中的夹杂物当量个数由18.4个/mm^2减少到11.3个/mm^2,其平均直径由8.4μm减小到4.5μm。相比原精炼渣系,采用优化渣系的65Mn在LF出站时的钢中Al_2O_3由5.9个/mm^2降低到1.7个/mm^2;其CaO-SiO_2-Al_2O_3和CaO-SiO_2-Al_2O_3-MgO复合夹杂物中Al_2O_3含量由38.3%~44.7%降低到17.5%~28.7%。B类Al_2O_3夹杂物不合格的卷数由6%降至3%。
基金Acknowledgements The authors acknowledge the financial supports from the National Natural Science Foundation of China （Grant No. 51320105003）, Shanghai government （Grant No. 14DZ2261200）, and the Science and Technology Commission of Shanghai Municipality （Grant No. 15520710800）.
文摘The pulsed magneto-oscillation （PMO） technique has the potential to be applied in the production of heavy steel ingot. In order to confirm it and achieve more insights, the solidification of rectangular 65Mn steel ingot with the size of 220 mm×220 mm × 1000 mm was investigated under the impact of PMO. Experimental results present that PMO treatment can remarkably refine the solidified microstructure of 65Mn steel ingot in comparison with the reference ingot without PMO. The application of PMO not only significantly reduces the grain size, but also promotes the morphology transition of equiaxed grains from well-developed dendritic structures to globular structures. And the resulted globular morphology is mainly due to the fact that the PMO-induced forced flow enhances the stability of crystal growth. As a consequence, the average tensile strength of as-cast samples is enhanced from 643.4 to 762.9 MPa under the application of PMO.
