Distribution of macro-inclusions in low carbon aluminium-killed steel slabs
Distribution of macro-inclusions in low carbon aluminium-killed steel slabs
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DOI：
10.1080/03019233.2017.1305676
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发表时间：
2018-08
影响因子：
2.1
通讯作者：
Xiaoxuan Deng;C. Ji;Wenliang Dong;Lin-ping Li;X. Yin;Yindong Yang;A. Mclean
中科院分区：
文献类型：
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作者：
Xiaoxuan Deng;C. Ji;Wenliang Dong;Lin-ping Li;X. Yin;Yindong Yang;A. Mclean
使用ASPEX自动夹杂物分析仪，在距板坯表面10毫米范围内进行步进加工，对低碳铝压钢板坯中的宏观夹杂物进行了表征。对板坯横截面内的枝晶结构进行了检测。结果表明，氧化铝团簇和带气泡的氧化铝是主要的宏观包裹体。沿板坯宽度方向，由于浸没入口喷口周围有较深的钩和冻结半月板，大块夹杂物主要分布在板坯中心。从板坯厚度上看，夹杂物主要集中在离板坯表面顶部3.5 ~ 6 mm的区域内，该区域柱状枝晶的倾角较小，表明凝固前沿的横流速度较小。宏观包裹体的数量密度与流速所产生的洗涤作用密切相关。高速铸造促进了这种行为，提高了板坯的表面质量。
Macro-inclusions in low carbon, aluminium-killed steel slabs were characterised by step-machining within a 10 mm zone from the slab surface using an ASPEX automatic inclusion analyzer. Dendritic structures within the cross-section of slabs were examined. The results show that alumina clusters and alumina associated with bubbles are the dominant macro-inclusions. Along the slab width direction, macro-inclusions were mostly found at the slab centre because of the deeper hooks and freezing meniscus surrounding the submerged entry nozzle. In terms of slab thickness, inclusions were mainly concentrated within the zone 3.5–6 mm from the top of the slab surface, where the columnar dendrites showed a relatively small inclination angle, indicating small cross-flow velocities at the solidification front. The number density of macro-inclusions were strongly dependent on the washing effect produced by the flow velocity. High speed casting promotes this behaviour and improves the surface quality of the slabs.