论文部分内容阅读
所有钢种在炼钢、精炼和浇铸过程期间均显示出二次氧化的现象。调查了在钙处理之前,通过一台配备有金色聚焦炉的共焦点扫描激光显微镜,直接观察氧化进程中在低碳铝镇静钢水表面上的二次氧化。因氧分压、气体流率和温度的不同,在熔融铝镇静钢上确定氧化物的形成、生长和聚集的数量。观察二次氧化产生所必需的时间,即是温度、同时也是气体流率的函数。经气体边界层至熔融表面,一种氧的气相物质转移导致过饱和和随后夹杂物的生成。在较高的实验温度时就降低了氧化物的生长。当单独的晶体足够大时,表面张力降低导致吸引力超过10-17N,结果,颗粒聚集在钢的表面。
All steel grades show secondary oxidation during the steelmaking, refining and casting processes. Investigated before the calcium treatment, through a confocal scanning laser microscope equipped with a gold focusing oven, the secondary oxidation on the surface of the low-carbon aluminum-killed molten steel was directly observed during the oxidation process. Due to differences in oxygen partial pressure, gas flow rate and temperature, the amount of oxide formation, growth and aggregation on the molten aluminum killed steel is determined. Observe the time necessary for the secondary oxidation to occur, which is the temperature and also the function of the gas flow rate. Via the gas boundary layer to the molten surface, an oxygen gas phase transfer causes supersaturation and subsequent inclusion formation. Oxide growth is reduced at higher experimental temperatures. When the individual crystals are large enough, the reduction in surface tension leads to attractive forces in excess of 10-17 N, with the result that the particles gather on the surface of the steel.