高拉速方坯连铸结晶器钢渣界面行为特征

对于高拉速连铸,结晶器内高通钢量下的钢液与保护渣流动行为控制是保证结晶器区合理凝固与冷却控制的重要一环。通过建立三维方坯连铸结晶器内多相流动、传热与凝固耦合数学模型,研究结晶器内高速钢液瞬态流动现象及其对液面波动与保护渣流动的影响。结果表明,结晶器内高速钢液冲击钢渣界面使弯月面处形成明显的凸起,同时导致水口附近界面波动剧烈。液态保护渣的流动行为受液面波动影响较大,不连续的保护渣流入造成了厚度不均匀的固态渣膜形成,不规整的固态渣膜转而又阻碍了液态保护渣的流入。

Interfacial behavior of steel and slag in billet mold during high casting speed

For continuous casting of high speed, the control of flow behavior of molten steel and mold slag under high steel quantity in mold is an important link to ensure reasonable solidification and cooling control in mold area. A mathematical model of multiphase flow, heat transfer and solidification coupling in a three-dimensional billet continuous casting mold was established to study the transient flow phenomenon of HSS in the mold and its effect on the liquid level fluctuation and the flow of protective slag.The results show that the impact of HSS on the steel slag interface in the crystallizer causes obvious bulge on the meniscus surface, and causes severe fluctuation of the interface near the nozzle.The flow behavior of the liquid flux is greatly affected by the fluctuation of the liquid level. The discontinuous flux causes the formation of the solid flux film with uneven thickness, and the irregular solid flux film in turn hinders the inflow of the liquid flux.