摘要
为了研究连铸坯全断面非金属夹杂物成分的空间分布,以帘线钢为研究对象,分析了连铸坯宽度方向中心位置由内弧到外弧夹杂物平均成分的变化。随着距连铸坯表层距离的增加,夹杂物中SiO_(2)质量分数由53%显著增加至75%左右,随后逐渐减少到60%;MnO质量分数先减少至12.59%,然后增加至27.87%;CaO和Al_(2)O_(3)含量变化较小。此外,建立了可用于预报连铸坯全断面夹杂物成分分布的动力学模型,该模型耦合了钢的传热和凝固、夹杂物成分转变热力学,以及元素在钢中的扩散3方面内容。使用该模型计算得到的氧化夹杂物成分的变化趋势与试验结果基本一致,验证了模型的准确性。同时利用该模型研究了不同总铝、总钙和总氧含量条件的连铸坯内夹杂物成分的演变。其中总铝含量对夹杂物的成分分布影响最大,当总铝质量分数由0.000 1%增至0.001 0%时,夹杂物中SiO_(2)质量分数由57%~64%降至34%~39%;Al_(2)O_(3)质量分数由8%~10%增至37%~41%;MnO含量基本上没有发生变化;CaO质量分数由13%~17%降至8%~10%。
In order to study the spatial distribution of non-metallic inclusions in continuous casting billet,the variation of the average composition of inclusions in a cord steel billet from the loose side to the fixed side was analyzed.With the increase of the distance from the surface layer of the billet,the SiO_(2) content ascended significantly from53%to about 75%firstly,and then declined to 60%.While the change of MnO content in inclusions declined to12.59% firstly,and then ascended to 27.87%.The contents of CaO and Al_(2)O_(3) inclusions changed little.An integrated model coupled with heat transfer,solidification,thermodynamic transformation of inclusion composition,and diffusion of dissolved elements in steel was established to predict the composition distribution of inclusions in the continuous casting billet.The calculated variation trend of oxide inclusion composition was consistent with the experimental one,which verified the accuracy of the model.Meanwhile,the evolution of inclusions in continuous casting billets of different total aluminum,total calcium,and total oxygen content was studied by using the model.The content of total aluminum had the greatest influence on the composition distribution of inclusions.When mass pertent of total aluminum increased from 0.000 1% to 0.001 0%,mass percent of SiO_(2) decreased from 57%-64% to 34%-39%;mass percent of Al_(2)O_(3) increased from 8%-10% to 37%-41%;the content of MnO changed little;and mass percent of CaO decreased from 13%-17% to 8%-10%.
作者
张月鑫
张立峰
王举金
牛凯军
王亚栋
ZHANG Yue-xin;ZHANG Li-feng;WANG Ju-jin;NIU Kai-jun;WANG Ya-dong(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China)
出处
《钢铁》
CAS
CSCD
北大核心
2021年第10期74-82,共9页
Iron and Steel
基金
国家自然科学基金资助项目(U1860206,51725402)
河北省省级科技计划资助项目(20311004D)。
