工程科学学报2016，Vol.38Issue(6)：780-786,7.DOI:10.13374/j.issn2095-9389.2016.06.006
低氧特殊钢中大尺寸DS类夹杂物生成机理
Formation mechanism of oversized DS-type inclusions in low oxygen special steel
摘要
Abstract
To investigate the generation mechanism of oversized DS-type inclusions in low oxygen special steel, a comparative analysis of inclusions was performed on overseas and domestic special steel samples by the automatic secondary electron microscopy ASPEX PSEM explorer. Both the average size and maximum size of inclusions are larger in domestic samples than overseas samples. Particularly, the maximum size of inclusions in domestic samples is several times that in overseas steel samples:24. 9 and 13. 1μm in domestic samples and 7. 6 and 7. 5μm in overseas samples, respectively. Based on the chemical composition analysis of inclusions in domestic samples, it is found that the oversized inclusions and smaller inclusions have similar compositions. Therefore, the detected DS-type inclusions are endogenous but not exogenous, which can be produced by collisions among inclusion particles. To further study the possible origins of the oversized DS-type inclusions, in-situ observation on the behaviors of inclusions at the solid/liquid interface in low oxygen special steel show that tiny inclusions less than 5μm can be easily and stably captured by the solid/liquid interface with a total oxygen content of 7í10 -6 . Moreover, collisions, agglomeration/coalescence and growth of inclusions captured by the solid/liquid interface result in the formation of much larger size DS-type inclusions over 12μm.关键词
特殊钢/夹杂物/尺寸/生成机理Key words
special steel/inclusions/size/formation mechanisms分类
矿业与冶金引用本文复制引用
姜敏,王昆鹏,侯泽旺,王新华..低氧特殊钢中大尺寸DS类夹杂物生成机理[J].工程科学学报,2016,38(6):780-786,7.基金项目
国家自然科学基金资助项目51304013) （）
国家重点基础研究发展规划资助项目(2010CB630806) （2010CB630806）
