垂直电磁搅拌对连铸轴承钢坯晶粒细化及宏观偏析控制的影响

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Yu Xu , En-gang Wang , Zhuang Li , An-yuan Deng
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引用次数: 15

摘要

研究了GCr15轴承钢在立式电磁搅拌(V-EMS)条件下的晶粒细化和宏观偏析控制。V-EMS可以产生向上的电磁力,并产生纵向的环形对流,使钢液的上部与下部更好地混合。结果表明,V-EMS的应用可以扩大等轴晶粒区域,减小二次枝晶臂间距,减少碳硫偏析。应用V-EMS后,高溶质浓度的钢液被带到枝晶尖端,使枝晶臂部分熔化。枝晶碎片的长度约为1.8 mm,是SDAS的10 ~ 12倍。当冷却水量从2.0 ~ 3.5 m3/h增加时,枝晶碎片呈现明显的V-EMS聚集现象。最后,基于Campanella等人的枝晶破碎理论,推导了V-EMS下枝晶破碎的判据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of vertical electromagnetic stirring on grain refinement and macrosegregation control of bearing steel billet in continuous casting

The grain refinement and macrosegregation control of GCr15 bearing steel were investigated under a type of rarely-used electromagnetic stirring, vertical electromagnetic stirring (V-EMS), in continuous casting. V-EMS can create an upward electromagnetic force and generate longitudinal loop convection, which enables the better mixing of the upper part with the lower part of the liquid steel. The results showed that applying V-EMS can enlarge the region of the equiaxed grain, decrease the secondary dendrite arm spacing (SDAS) and reduce the segregation of both carbon and sulfur. After applying V-EMS, liquid steel with a high solute concentration is brought to the dendrite tips, making the dendrite arms partially melt. The length of the dendrite fragment is approximately 1.8 mm, 10 to 12 times the SDAS. Upon increasing the amount of cooling water from 2.0 to 3.5 m3/h, the dendrite fragments exhibit an obvious aggregation following V-EMS. Finally, a criterion for dendrite fragmentation under V-EMS was derived based on the dendrite fragmentation theory of Campanella et al.

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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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