BFe10白铜管材热冷组合铸型水平连铸凝固温度场模拟

建立了热冷组合铸型(HCCM)水平连铸管材温度场模拟模型,采用实验与模拟相结合的方法修正界面的换热系数条件。所建立的HCCM水平连铸全尺寸模拟模型和所施加边界条件的误差小于6%,可较好地模拟实际传热过程的温度场。模拟结果表明:当拉坯速度由20 mm/min增加到110 mm/min时,两相区宽度由20 mm增加至30 mm;当热型段加热温度由1 150℃提高到1 300℃时,两相区宽度由30 mm减小至12 mm;当冷型段冷却水流量由300 L/h增加到900 L/h时,两相区宽度由30 mm减小至20 mm;当采用增加热阻的改进铸型结构时,两相区宽度由25 mm减小至12 mm。d 50 mm×5 mm BFe10管材HCCM水平连铸合理的制备参数为:熔体保温温度1 250℃,连铸拉坯速度50~80 mm/min,热型段加热温度1 200~1 300℃,冷型段冷却水流量500~700 L/h。

Solidification temperature field simulation of BFe10 cupronickel tube during heating-cooling combined mold continuous casting

The model of solidification temperature field simulation during Heating-Cooling Combined Mold(HCCM) continuous casting was established and the heat transfer coefficient of interface was revised by the method of experiment combined with simulation.The established full-size model of HCCM continuous casting and the imposed boundary conditions could reflect the actual transfer process better with the error less than 6%.The simulation results show that with increasing drawing speed from 20 mm/min to 110 mm/min,the width of two-phase regions increases from 20 mm to 30 mm;with raising heating temperature from 1 150 ℃ to 1 300 ℃,the width of two-phase regions decreases from 30 mm to 12 mm;with increasing cooling water flow from 300 L/h to 900 L/h,the width of two-phase regions decreases from 30 mm to 20 mm;when an improved mold with a structure to add thermal resistance is adopted,the width of two-phase regions decreases from 25 mm to 12 mm.The appropriate parameters of d 50 mm×5 mm BFe10 tube by HCCM continuous casting are as follows: holding temperature of melt 1 250 ℃,drawing speed 50-80 mm/min,heating temperature of heating section 1 200-1 250 ℃,cooling water flow of cooling section 500-700 L/h.