利用VOF(volume of fluid)方法和Lagrangian离散模型模拟了厚度为135 mm中薄板坯连铸结晶器内的钢液流动及钢/渣界面波动行为,分析了结晶器宽度、水口浸入深度、水口侧孔倾角、拉速和吹氩对结晶器内钢液流动和液面波动的影响规律.结果表...利用VOF(volume of fluid)方法和Lagrangian离散模型模拟了厚度为135 mm中薄板坯连铸结晶器内的钢液流动及钢/渣界面波动行为,分析了结晶器宽度、水口浸入深度、水口侧孔倾角、拉速和吹氩对结晶器内钢液流动和液面波动的影响规律.结果表明:钢液从三孔浸入式水口流入结晶器后形成上、下三个回流区;吹氩使结晶器上回流区靠近水口附近形成二次涡流;在一定拉速下,增加水口侧孔倾角和浸入深度均能有效抑制钢/渣界面波动;增加拉速和在一定拉速下增加结晶器宽度均将加剧液面波动.展开更多
Laboratory-scale experiments were performed to investigate the deoxidation of H13 tool steel with CaF_(2)-MgO-Al_(2)O_(3)-CaO-SiO_(2) slags at 1873 K.The calculation of thermodynamics and kinetics was also verified th...Laboratory-scale experiments were performed to investigate the deoxidation of H13 tool steel with CaF_(2)-MgO-Al_(2)O_(3)-CaO-SiO_(2) slags at 1873 K.The calculation of thermodynamics and kinetics was also verified through the experimental results.The results show that[Si]-[O]reaction is the control reaction,and with the increase of basicity of slag,the limitation of deoxidation was decreased.The limitation of deoxidation is the lowest for the slag with basicity of 2.0.Under the conditions of the basicity of 2.0 and the content of CaF_(2) more than 50%,the limitation of deoxidation is less than 10×10^(−6),and it does not depend on the contents of Al_(2)O_(3) and CaF_(2) in slags.The mass transport of oxygen in the metal phase is the rate-controlling step,and the slag composition has no effect on the equilibrium time of deoxidation.Based on this finding,the optimized slag composition is designed and it contains the following components:51.5%CaF_(2),20.3%MgO,16.2%Al_(2)O_(3),8.2%CaO and 3.8%SiO_(2).In the case of the optimized deoxidizing slag,the total oxygen content in H13 steel can be reduced from 25×10^(−6) to 6×10^(−6).展开更多
文摘利用VOF(volume of fluid)方法和Lagrangian离散模型模拟了厚度为135 mm中薄板坯连铸结晶器内的钢液流动及钢/渣界面波动行为,分析了结晶器宽度、水口浸入深度、水口侧孔倾角、拉速和吹氩对结晶器内钢液流动和液面波动的影响规律.结果表明:钢液从三孔浸入式水口流入结晶器后形成上、下三个回流区;吹氩使结晶器上回流区靠近水口附近形成二次涡流;在一定拉速下,增加水口侧孔倾角和浸入深度均能有效抑制钢/渣界面波动;增加拉速和在一定拉速下增加结晶器宽度均将加剧液面波动.
基金Project(18SYXHZ0069)supported by the Science and Technology Program of Sichuan Province,ChinaProjects(51974139,51664021)supported by the National Natural Science Foundation of China。
文摘Laboratory-scale experiments were performed to investigate the deoxidation of H13 tool steel with CaF_(2)-MgO-Al_(2)O_(3)-CaO-SiO_(2) slags at 1873 K.The calculation of thermodynamics and kinetics was also verified through the experimental results.The results show that[Si]-[O]reaction is the control reaction,and with the increase of basicity of slag,the limitation of deoxidation was decreased.The limitation of deoxidation is the lowest for the slag with basicity of 2.0.Under the conditions of the basicity of 2.0 and the content of CaF_(2) more than 50%,the limitation of deoxidation is less than 10×10^(−6),and it does not depend on the contents of Al_(2)O_(3) and CaF_(2) in slags.The mass transport of oxygen in the metal phase is the rate-controlling step,and the slag composition has no effect on the equilibrium time of deoxidation.Based on this finding,the optimized slag composition is designed and it contains the following components:51.5%CaF_(2),20.3%MgO,16.2%Al_(2)O_(3),8.2%CaO and 3.8%SiO_(2).In the case of the optimized deoxidizing slag,the total oxygen content in H13 steel can be reduced from 25×10^(−6) to 6×10^(−6).
