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为了研究钢中稀土夹杂物的分布和元素偏析,解剖了三支钢锭和一些钢坯。结果表明,稀土处理后,钢中 MnS 消失而形成稀土的硫化物和硫氧化物。这些稀土夹杂物与金属晶体一起沉降到钢锭底部形成夹杂物的宏观偏聚区,从而导致锭中稀土、硫及氧的偏析并使硫呈现反常分布。稀土夹杂物分布在铸态晶粒内部因而使枝晶间的组织发生变化,改善了铸态材料的性能。加入稀土金属的方法不同,锭中夹杂物的偏聚和钢中元素偏析状态亦有差别,一种锭模内加入法获得良好的结果。
In order to study the distribution and elemental segregation of rare earth inclusions in steel, three ingots and some billets were dissected. The results show that after rare earth treatment, MnS disappears in the steel to form rare earth sulfides and sulfur oxides. These rare earth inclusions settle together with the metal crystals to the macroscopic segregation zone of inclusions in the ingot bottom, resulting in the segregation of rare earths, sulfur and oxygen in the ingots and the abnormal distribution of sulfur. Rare earth inclusions are distributed within the as-cast grains and thus the structure of the interdendritic grains is changed, improving the properties of the as-cast material. Different methods of adding rare earth metals, inclusions in the segregation of segregation and segregation of elements in the steel are also different, an ingot die addition method to obtain good results.