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Fundamental study to develop process for producing ultra clean steel with confocal scanning laser microscope (In-situ observation and analysis of agglomeration and removal of non-metallic inclusions in metal melts)

共焦扫描激光显微镜超洁净钢生产工艺的基础研究（金属熔体中非金属夹杂物团聚与去除的原位观察与分析）

基本信息

批准号：
07455298
负责人：
EMI Toshihiko
金额：
$ 4.74万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

The behavior of various non-metallic inclusion particles on molten steel surface was "in-situ" studied by using a confocal scanning laser microscope combined with an infrared image furnace. A long-range strong attraction between alumina and alumina-rich solid inclusion particles, and detailed sequence of the collision, agglomeration and formation of alumina clusters was observed on molten steel surface. This attraction force was found to be over 10^<-16>N,reach over 10mum for alumina particles larger than 3mum, and play an important role to promote collision between the particles to form intermediate aggregates, the same between the intermediate aggregates to form loose alumina cluster, and to densify the loose clusters into compact ones. This force was not influenced by the existence of surfactant sulfur in the steel melt. The origin of this long-range strong attraction was examined to be caused by capillary effect around alumina particles on molten steel surface. Solid CaO-Al_2O^3 and CaO-Al_2O_3-SiO_2 inclusion particles were subjected to quick agglomeration to form clusters which densified and deformed into massive solid inclusion particles much easier. The attraction was also found to be in the range of 10^<-16>-10^<-13>N for different particles and extended to a distance of up to 100mum. However, such capillary attraction was not at all found between liquid CaO-Al_2O_3-SiO_2 inclusion particles. Even when the two liquid particles came in touch, merger took place only after contacting for a while. The merger of liquid CaO-Al_2O_3 particles was even more difficult for small particles of less than 7mum, but easier for particles larger than 24mum. Furthermore, an interaction of non-metallic inclusions with advancing melt/solid interface of steel crystals was investigated. The engulfment and pushing of inclusions by the melt/solid interface were clearly observed, and criteria for the engulfment were determined for different inclusion species.

采用激光共聚焦显微镜结合红外成像炉对钢液表面各种非金属夹杂物颗粒的行为进行了“原位”研究。在钢液表面观察到氧化铝和富氧化铝固体夹杂物颗粒之间的长程强吸引力以及氧化铝团簇碰撞、团聚和形成的详细过程。这种吸引力大于10 μ <-16>N，对于大于3 μ m的氧化铝颗粒可达10 μ m以上，并在促进颗粒之间碰撞形成中间聚集体，中间聚集体之间碰撞形成松散的氧化铝团簇，以及将松散的团簇致密化成致密的团簇方面起着重要作用。钢液中表面活性剂硫的存在不影响该力。这种长程强吸引力的来源被认为是由钢液表面氧化铝颗粒周围的毛细效应引起的。CaO-Al_2 O_3和CaO-Al_2 O_3-SiO_2夹杂物颗粒快速团聚形成团簇，团簇更容易致密变形为块状固体夹杂物颗粒。对于不同的粒子，引力也在10^<-16>-10 ^<-13>N的范围内，并延伸到100 μ m的距离。而CaO-Al_2 O_3-SiO_2包裹体颗粒之间则不存在这种毛细引力。即使两种液体粒子接触，也要接触一段时间后才能合并。CaO-Al_2 O_3液相颗粒的合并对小于7 μ m的小颗粒更困难，而对大于24 μ m的颗粒更容易。此外，研究了非金属夹杂物与钢晶体前进的液/固界面的相互作用。熔体/固体界面的夹杂物的吞没和推动被清楚地观察到，并确定了不同的夹杂物物种的吞没的标准。