行波磁场下吹Ar过程中结晶器内气泡行为的研究
STUDY ON THE BEHAVIOUR OF BUBBLES IN A CONTINUOUS CASTING MOLD WITH Ar INJECTION AND TRAVELING MAGNETIC FIELD
查看参考文献26篇
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文摘
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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. |
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其他语种文摘
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Steel flow control in a continuous slab caster mold is effective for preventing entrapments of both mold power and argon gas bubbles and maintaining high slab quality.The steel flow control technology that utilizes a traveling magnetic field to optimize the flow of steel in the mold has been developed and applied.The moving magnetic fields can induce accelerating flow(electromagnetic level accelerator,EMLA),decelerating flow(electromagnetic level stabilizer,EMLS) and rotating flow (electromagnetic rotary stirring,EMRS) according the travel direction of the fields.EMLS mode applies a low frequency alternating magnetic field that moves from the narrow face of the mold to the mold center below the nozzle exits.In this study,the model experiments were carried out using liquid alloy of Pb-Sn-Bi and argon gas to study the two-phase fluid flow in the mold with a low frequency traveling magnetic field.The resistance probe was applied to measure the distribution of gas bubbles below the liquid surface and in the deeper liquid phase in the mold.The effect of various parameters such as magnetic flux density,casting speed and argon gas flow rate on the movement and distribution of argon gas bubbles in the mold was studied.The results indicate that the quantity of gas bubbles near the narrow face increases with increasing argon gas flow rate and casting speed.With imposed traveling magnetic field,the quantity of gas bubbles near narrow face at deep position in the pool was decreased,so the possibility that gas bubbles were entrapped into the solidification shell of the steel can be decreased,and the asymmetrical floating of bubbles along the width of mold for a higher casting speed was depressed,so higher disturbances at the free surface in the mold caused by excessive floating of gas bubbles locally can be avoided.The investigations on the floating of big bubbles revealed that the coalescence and flotation of bubbles can be enhanced with imposed traveling magnetic field,and the floating of big bubbles along the width of mold get more uniformity at 0.12 T. |
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来源
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金属学报
,2012,48(8):951-956 【核心库】
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DOI
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10.3724/sp.j.1037.2011.00792
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关键词
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模拟实验
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连铸结晶器
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低频行波磁场
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气泡分布
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电阻探针
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地址
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东北大学, 材料电磁过程研究教育部重点实验室, 沈阳, 110819
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语种
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中文 |
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ISSN
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0412-1961 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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辽宁省高校创新团队计划项目
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中央高校基本科研业务费专项资金
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文献收藏号
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CSCD:4623348
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