CAJ | 학술논문

未经末端电磁搅拌（F-EMS）的连铸圆坯上未出现白亮带，应用电磁搅拌（电流强度249.67 A、频率6.6 Hz）的连铸坯产生了白亮带，用金属原位分析仪研究了白亮带区域的元素分布。结果表明，白亮带区存在C、Si、Mn、S、P元素的负偏析。分析认为，电磁搅拌形成的钢液对流将富溶质元素的钢液带走后形成了C元素的偏析负区，该区域在随后的冷却中形成了尺寸较大的铁素体晶粒，酸浸时相对其他区域更耐腐蚀而显示为白色。
미경말단전자교반（F-EMS）적련주원배상미출현백량대，응용전자교반（전류강도249.67 A、빈솔6.6 Hz）적련주배산생료백량대，용금속원위분석의연구료백량대구역적원소분포。결과표명，백량대구존재C、Si、Mn、S、P원소적부편석。분석인위，전자교반형성적강액대류장부용질원소적강액대주후형성료C원소적편석부구，해구역재수후적냉각중형성료척촌교대적철소체정립，산침시상대기타구역경내부식이현시위백색。
The continuous casting round bloom shows no“white band”without final electromagnetic stirring (F-EMS) stirring. However, when the F-EMS is applied with current intensity 249.67 A and the frequency 6.6 Hz, the white band appears. Elements distribution is studied by the original position statistic distribution analysis (OPA). The results showed that the white band consists of a zone of negative segregation of elements carbon, silicon, manganese, phosphorus and sulfur. White band generation mechanism is as follows:F-EMS generates stirring of liquid steel and washes away the enriched solute elements liquid to result in the carbon negative segregation zone. In this zone ferrite grains of larger size formed with subsequent cooling, which is more resistant to corrosion than other zone in the acid leaching and displays in white.