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出钢时向装13吨钢液的钢包中加入适量的稀土和铝,人为地造成浇注初期发生水口结瘤并堵死。包内钢液自然冷却凝固后,解剖研究凝固钢体,发现钢中稀土夹杂物的特征是:(1)凝钢块的下部三分之一区域内和边缘部份稀土夹杂物较多,中部较少,上半部的中间区域基本上没有稀土夹杂物,(2)上半部中间区域是最后凝固的,其中硫化物(硫化锰)夹杂多,这只能是钢液中稀土夹杂物氧化所致,(3)钢包中的稀土夹杂发生了明显聚集,形成一些较大的聚合体,其形态与在水口结瘤中所见相似,(4)稀土夹杂聚合的主要方式是由小颗粒相互合并成大颗粒,(5)在有稀土夹杂物的区域,愈接近包底夹杂物粒度愈大。
Tapping 13 tons of molten steel ladle to add the right amount of rare earth and aluminum, artificially caused by the beginning of pouring nozzle nodules and blocked. After the steel liquid in the bag is naturally cooled and solidified, anatomical study of the solidified steel body reveals that the characteristics of the rare earth inclusions in the steel are as follows: (1) There are more rare earth inclusions in the lower one-third area and the edge of the steel block, Less, the middle part of the upper half is substantially free of rare earth inclusions, (2) the middle part of the upper half is finally solidified, and the sulfide (manganese sulphide) is more mixed, which can only be the oxidation of the rare earth inclusions in the molten steel (3) The rare earth inclusions in the ladle are obviously aggregated to form some larger aggregates whose morphology is similar to that seen in the nodal nodules. (4) The main way of rare earth inclusion polymerization is that the small particles interact with each other Combined into large particles, (5) in the region with rare earth inclusions, the more inclusions closer to the bottom of the package size larger.