真空电弧重熔过程中白斑缺陷的成因分析  

Formation mechanisms of white spot defect during vacuum arc remelt ingot

作　　者：于腾[1] 杨玉军[1] 宋彬 李凤艳[1] 刘宁[1] 潘彦丰[1] YU Teng;YANG Yujun;SONG Bin;LI Fengyan;LIU Ning;PAN Yanfeng(Technology Center,FuShun Special Steel Group Co.,Ltd.,Fushun 113001,Liaoning,China)

机构地区：[1]抚顺特殊钢股份有限公司技术中心,辽宁抚顺113001

出　　处：《金属功能材料》2022年第2期28-33,共6页Metallic Functional Materials

基　　金：国家重点研发计划项目(2019YFA0705300)。

摘　　要：对真空电弧重熔过程中的白斑缺陷进行了分类,并对其成因进行了详细的分析。白斑缺陷可分为离散型、枝晶型和凝固型,偏弧和过长的弧长是白斑缺陷形成的主要原因。偏弧会使熔池的温度场和流场发生变化,导致熔池中掉落的非金属漂浮物、锭冠、喷溅物和掉块等不能完全熔化,形成白斑缺陷。弧长过长,弧光稳定性变差,不能保持稳定的漫散弧进行冶炼,锭冠和熔池喷溅物将被失稳的弧光扫落形成白斑缺陷。稳定的漫散电弧可以避免白斑缺陷的形成,对提高真空电弧重熔铸锭的冶金质量起着至关重要的作用。The classification and formation of white spot during vacuum arc remelt(VAR) was study. White spot defects were classified as discrete white spots, dendritic white spots and solidification white spots. The constricted arc and longer arc length were the main causes for white spots. Constricted arc will change the temperature field and flow field of the molten pool, resulting in the falling oxides and nitrides, crown, splatter breads and falling blocks in the molten pool cannot be completely melted, forming white spot defects. If the arc length is too long, the arc stability becomes poor, and the stable diffuse arc cannot be maintained for remelting, the crown and splatter breads will be swept down by the unstable arc to form white spot defects. Therefore, the stable diffuse arc could prevent the formation of white spot defects.

关 键 词：真空电弧重熔 白斑 电弧稳定性 

分 类 号：TF132[冶金工程—冶金物理化学]