摘要
实验室条件下使用Al脱氧,考察精炼渣中TiO2对含Ti不锈钢中夹杂物的影响。结果表明,精炼渣中不含TiO2时,夹杂物从Al2O3区向MgO-Al2O3区演变,形成MgO-Al2O3的直径约4μm;精炼渣中含有TiO2时,夹杂物先向高TiOx区演变,再向MgO-Al2O3区演变,最终形成2~3μm的MgO-Al2O3-TiOx。分析表明,当精炼渣中含有TiO2时,夹杂物中出现TiO2,减小了夹杂物的尺寸,而且精炼渣中添加TiO2使得渣中TiO2的活度增大,抑制了钢中Ti的氧化,增加了TiN的析出数量与尺寸,导致周围富集的Nb含量较少,减小了NbC的尺寸。
The effect of TiO2 in the refining slag on the inclusions in Ti-containing stainless steel was investigated under laboratory conditions during Al deoxidation.The results indicate that the inclusions initial Al2O3 forms then change into MgO-Al2O3 type inclusions with the dimention of 4μm when the top slag does not contain TiO2.In the case of TiO2-bearing slag,the inclusion composition is migrated firstly to the high TiOx region,then to MgO-Al2O3 types.Finally,TiO2-MgO-Al2O3 forms in average size of 2~3μm.The inclusion size is decreased with the addition of TiO2.And the presentence of TiO2 in top slag can prevent the oxidation of Ti in molten steel by increasing the activity of TiO2 in slag phase.Meanwhile,TiN precipitation is enhanced both in amount and size,which also lowers the Nb content around TiN.Thus,NbC participation becomes smaller then that participate in the sample refined by the slag without TiO2.
作者
冯晓霞
王旗
谭博
王丽君
周国治
Feng Xiaoxia;Wang Qi;Tan Bo;Wang Lijun;Chou Kuochin(Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)
出处
《钢铁钒钛》
CAS
北大核心
2020年第2期108-113,共6页
Iron Steel Vanadium Titanium
基金
国家自然科学基金(U1810207)
国家自然科学基金(51734002)。
