连铸结晶器内钢液弯月面行为的研究

Behavior of Liquid Steel Meniscus in Mold of Continuous Caster

在自行设计的可以实现振动、水冷及拉坯的连铸模拟装置上，用低熔点的Pb-Sn－Bi合金模拟钢液，用硅油模拟保护法对弯月面行为进行了研究．结果表明：增加过热度使得弯月面与结晶器壁的接触角变小，弯月面的高度降低；在弯月面区域加上电磁场时，弯月面向结晶器中心拱起，其拱起程度随着电磁强度和磁场频率的增加相应增大，但液态金属高的过热度会削弱电磁场的作用效果；结晶器振幅增大及拉速提高均会使弯月面处液态金属的波动程度增大．通过测定正、负滑脱期弯月面处液态金属的速度场，验证了前人提出的振痕形成的机理．

Behavior of liquid steel meniscus is studied on the c. c. simulator. Low melting point Pb-Sn-Bi alloy and silicon oil are adopted as simulators of molten steel and slag, respectively. The shape of meniscus and the fluctuation and motion of liquid metal in meniscus zone are investigated. It is shown that the superheat of molten metal and electromagnetic force have influence on the shape of meniscus, and that the fluctuation at meniscus is intensified by increasing mold oscillation amplitude and casting speed. The velocity fields of liquid metal at meniscus are measured during the positive-strip period and the negative-strip period, respectively, from which the mechanism of oscillation mark formation is verified.