论文部分内容阅读
采用Pb-Sn-Bi合金进行模拟实验.研究了吹Ar过程中施加低频行波磁场时结晶器内气泡的运动和分布.用电阻探针法测量了结晶器内金属液面下及液相深处的气泡分布,考察了磁感应强度、拉速和吹气量对结晶器内气泡运动、数量和分布的影响.结果表明,吹气量和拉速的增加使结晶器窄面附近的气泡数量增多;施加行波磁场使液相深处窄面附近的气泡数量减少,减少了气泡破凝固坯壳捕获的可能性,并且抑制了高浇速时沿结晶器宽度方向气泡上浮不均匀的现象,可避免局部气泡上浮数量过多而对液面扰动过大.通过对大气泡分布规律的研究发现施加行波磁场使气泡聚合现象增强,促进了气泡的上浮,且当磁感应强度增加到0.12 T时大气泡在结晶器宽度方向上浮更均匀.
Pb-Sn-Bi alloy was used to simulate the movement of bubbles in the mold, and the distribution of bubble in the mold was studied by applying the low-frequency traveling-wave magnetic field in Ar process. The influence of the magnetic induction intensity, the pulling speed and the blow volume on the movement, the number and the distribution of the bubble in the mold were investigated.The results show that the increase of air blowing rate and pulling speed increase the number of bubbles near the narrow face of the mold, The traveling wave magnetic field reduces the number of bubbles near the narrow surface in the liquid phase, reduces the possibility of entrapment of the solidified shell by bubbles and inhibits the phenomenon of uneven floating of bubbles along the width of the crystallizer at high casting speeds, The bubble floating too much and the liquid surface perturbation is too large.Based on the study of the distribution of large bubbles found that the application of traveling-wave magnetic field to enhance the phenomenon of bubble polymerization, and promote the bubble floating, and when the magnetic flux density increases to 0.12 T, Mold width upward floating more uniform.