第一作者：孙萌
通讯作者：姜周华,李阳
合写作者：陈常勇,马帅,鸡永帅,王举,马彦硕
发表刊物：Steel Research International
期号：1
卷号：94
影响因子：2.1
DOI码：10.1002/srin.202200379
所属单位：东北大学冶金学院
教研室：绿色智能特殊钢冶金研究中心
摘要：The current study investigates the effect of the timing of the addition of ferrosilicon with Al and Ca impurities on the inclusion evolution during the refining process of Al-killed gear steel SCr420H. To achieve this aim, laboratory experiments and thermodynamic calculations are conducted. The process sample, the ingot sample, and ferrosilicon are polished and analyzed by scanning electron microscope-energy dispersive spectrometer. The results show that Ca and Al impurities mainly exist as intermetallic compounds or are segregated on the phase boundary between FeSi2 and Si in the ferrosilicon. The Ca content of the ingot increased with the delay of adding the ferrosilicon with Al and Ca impurities. In case the ferrosilicon is added at the end of the refining process, many liquid calcium aluminate inclusions can be observed in the ingot, which indicates that changing the timing of adding ferrosilicon with Al and Ca impurities is a promising way to modify inclusion to liquid inclusion. Based on the thermodynamic calculation, MgO-saturated spinel is more easily modified into CaO–Al2O3 inclusion than spinel with low MgO content. When ferrosilicon is added in steel containing enough Mg, inclusions are transformed into spinel with high MgO content first, and afterward are modified into liquid calcium aluminate inclusions.
关键字：calcium aluminate, ferrosilicon, inclusion, modification, spinel
论文类型：SCI
备注：无
学科门类：工学
一级学科：冶金工程
页面范围：2200379
ISSN号：1611-3683
是否译文：否