摘要
基于409L不锈钢VOD生产实际,分析了Al脱氧条件下MgO.Al2O3复合夹杂物的组成形态;同时采用热力学计算方法得出1873K时MgO,MgO.Al2O3和Al2O3的平衡相图,研究了MgO.Al2O3夹杂物生成与转变的热力学条件.结果表明,钢水中的尖晶石复合夹杂物中的MgO.Al2O3相呈非晶态结构,夹杂物尺寸在5μm左右.生产过程中,当钢水中Al的质量分数控制在0.04%,w(Mg)≥1.3×10-8时,钢水中即可生成MgO.Al2O3夹杂物;w(Mg)≥9.7×10-7时,MgO.Al2O3开始转变成为MgO夹杂.
Based on VOD vacuum refining process,the composition and morphology of MgO·Al2O3 compound inclusion in 409L stainless steel deoxidized by aluminum were analyzed.A phase diagram between MgO,MgO·Al2O3 and Al2O3 at 1 873 K was drawn through thermodynamic calculation to investigate the thermodynamic conditions of MgO·Al2O3 inclusion formation and transformation.The results showed that the pure MgO·Al2O3 phase of spinel compound inclusion in molten steel present amorphous structure,where the inclusion size is about 5 μm.On the condition that Al content is controlled at 0.04 wt% in molten steel together with w（Mg）≥1.3×10-8,the MgO·Al2O3 inclusion will form Al2O3,it will transform into MgO inclusion if w（Mg）≥9.7×10-7.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第6期848-851,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(50704010)
