CAJ | 학술논문

采用ASPEX扫描电镜中的自动特征分析功能研究了交换钢包过程(取样浇次第4、5炉)对IF钢连铸板坯表层的洁净度的影响,且对比研究了交换钢包过程浇铸铸坯(交接坯)与正常浇铸铸坯(正常坯)的表层洁净度.结果表明：正常坯与交接坯中尺寸大于20μm的表层夹杂物可分为三类：(1)簇群状Al2O3(包括气泡+簇群状Al2O3)；(2)簇群状TiOx- Al2O3夹杂物；(3)保护渣夹杂物.正常坯表层的大型夹杂物主要为簇群状Al2 O3,没有检测到保护渣夹杂物.换包开浇后铸坯总氧质量分数从14×10-6增至17×10-6,交接坯表层检测到较多的第2夹杂物,说明钢包开浇后钢水被轻微氧化.此外,钢包开浇后剧烈的液面波动也导致了保护渣的卷入.在当前工艺下,换包对IF钢铸坯表层洁净度的影响长度约为11 m.
채용ASPEX소묘전경중적자동특정분석공능연구료교환강포과정(취양요차제4、5로)대IF강련주판배표층적길정도적영향,차대비연구료교환강포과정요주주배(교접배)여정상요주주배(정상배)적표층길정도.결과표명：정상배여교접배중척촌대우20μm적표층협잡물가분위삼류：(1)족군상Al2O3(포괄기포+족군상Al2O3)；(2)족군상TiOx- Al2O3협잡물；(3)보호사협잡물.정상배표층적대형협잡물주요위족군상Al2 O3,몰유검측도보호사협잡물.환포개요후주배총양질량분수종14×10-6증지17×10-6,교접배표층검측도교다적제2협잡물,설명강포개요후강수피경미양화.차외,강포개요후극렬적액면파동야도치료보호사적권입.재당전공예하,환포대IF강주배표층길정도적영향장도약위11 m.
The effect of ladle change process (the 4th heat to the 5th heat) on the surface cleanliness of IF steel continuous cast-ing slabs was investigated by total oxygen measurement and automatic feature analysis equipped on ASPEX. A comparison of surface cleanliness was performed between transition slabs ( cast during ladle change process ) and normal slabs ( cast under normal condi-tion). It is found that inclusions larger than 20μm are classified into three types:(1) cluster alumina (including bubble + cluster a-lumina inclusions);(2) cluster TiOx-Al2 O3 inclusions; and (3) mold powder inclusions. In terms of surface inclusions in normal slabs, most of the inclusions detected in the scanning area are cluster alumina, and no mold powder inclusions are found. While for transition slabs, the total oxygen content increases from 14 × 10 -6 to 17 × 10 -6 , and the number density of Type 2 inclusions goes up since the cast start of the 5th heat, indicating re-oxidation of the steel melt during ladle change process. Furthermore, level fluctuation in the mold is also severe since the cast start of the 5th heat, leading to mold powder entrapments. The affected length of cast slabs dur-ing ladle change process is about 11 m under the present casting condition.