钛脱氧钢中超细夹杂物内部结构和物相组成研究
齐江华
武汉钢铁(集团)公司研究院
Research on Inner Structure and Phase Composition of Precipitated Superfine Inclusion during Solidification of the Ti-deoxidized Steel
摘要 在真空感应炉中采用了真空碳脱氧再加钛终脱氧的脱氧工艺冶炼出与高级别管线钢成分接近的试样钢，对钢液凝固析出夹杂物的外部形貌、尺寸、内部结构和物相组成等进行了深入系统的研究。在扫描电镜下通过对金相试样和电解提取的夹杂物研究表明，本实验条件下钢液凝固过程中析出的夹杂物是Ti-O-Mn-S形成的尺寸为1～3μm的球形复合夹杂物；通过离子减薄后观察了夹杂物的内部结构，中心是Ti-O化合物，外围是Mn-S化合物；通过电子背散射衍射（EBSD）对夹杂物的物相组成的分析表明了该复合夹杂物是有利于针状铁素体形核的Ti2O3和在凝固过程中以Ti2O3为核心形核的MnS。
Abstract ：The study smelted and made the steel ingot of which the component is close to the high grade pipeline steel with the design principle of carbon-deoxidation and end-deoxidation with Ti in the vacuum induction furnace. What have also been researched are the external shape, size, inner structure and phase composition of the Ti-deoxidized products. Through the study of metallographic specimen and the inclusions through electrolyzation under SEM, it is indicated that the Ti-deoxidized products are globular compound inclusions with the size of 1~3μm in this experiment condition. With the technical of ion beam thinner the inner structure of these inclusions can be observed, whose core is Ti-O and outer is Mn-S. Based on EBSD the phase composition has been analyzed and it indicated that these globular compound inclusions are Ti2O3 and MnS with nucleating center Ti2O3, which can prompt to nucleate IGF.
收稿日期: 2009-06-12
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2010, Vol. 45 
