Fe-Mn-Al-C低密度钢中的脱氧合金化夹杂物  

Deoxygenated alloying inclusions in Fe-Mn-Al-C low density steel

作　　者：曹磊 郭宇航 王国承[1,2] 尚德礼 CAO Lei;GUO Yuhang;WANG Guocheng;SHANG Deli(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;Key Laboratory of Metallurgy Engineering Liaoning Province,Anshan 114051,Liaoning,China;Iron and Steel Research Institutes of Ansteel Group Corporation,Anshan 114009,Liaoning,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]辽宁省高校冶金工程重点实验室,辽宁鞍山114051 [3]鞍钢集团钢铁研究院,辽宁鞍山114009

出　　处：《中国冶金》2023年第10期42-49,共8页China Metallurgy

基　　金：国家自然科学基金资助项目(52174318)。

摘　　要：为了研究Fe-Mn-Al-C低密度钢脱氧合金化夹杂物的生成及机理,采用Si、Mn、Al进行脱氧合金化,通过场发射扫描电子显微镜结合夹杂物自动分析系统对Fe-Mn-Al-C低密度钢样品中的夹杂物进行观察。结果显示,Fe-Mn-Al-C低密度钢中夹杂物主要分为6类,即单颗粒Al_(2)O_(3)夹杂物、单颗粒MnS夹杂物、单颗粒AlN夹杂物、Al_(2)O_(3)-MnS复合夹杂物、AlN-MnS复合夹杂物、Al_(2)O_(3)-AlN-MnS复合夹杂物。单颗粒的Al2O3、MnS、AlN夹杂物的数量相对较多,夹杂物尺寸以小于5μm为主。热力学计算发现Al2O3在脱氧合金化时生成,AlN在固相分数为0.844时开始析出,而MnS在完全凝固后的固相钢中开始析出。不同夹杂物间的二维晶格错配度计算结果显示,MnS(110)/Al_(2)O_(3)(001)、AlN(001)/Al_(2)O_(3)(001)和MnS(100)/AlN(100)错配度分别为8.41%,11.66%和8.94%,说明Al_(2)O_(3)和AlN可以为MnS的形核提供异质形核位点,Al_(2)O_(3)同样也可以为AlN的形核提供异质形核位点。利用FactSage 8.2热力学软件计算发现,从1 873 K冷却至373 K时,Al_(2)O_(3)、AlN和MnS夹杂物的质量分数分别为0.129%、0.017%和0.615%。研究结果可以为研究Fe-Mn-Al-C低密度钢脱氧合金化夹杂物的生成机理提供一定的理论指导。In order to study the formation and mechanism of inclusions in Fe-Mn-Al-C low density steel during deoxygenation alloying,Si,Mn,and Al were used for deoxygenation alloying of the steel.Inclusions in Fe-Mn-Al-C low density steel samples were observed by field emission scanning electron microscopy combined with automatic inclusion analysis system.The results show that the inclusions in Fe-Mn-Al-C low density steel are classified into six types,single particle Al_(2)O_(3)inclusion,single particle MnSinclusion,single particle AIN inclusion,Al_(2)O_(3)-MnS composite inclusion,AIN-MnS composite inclusion and Al_(2)O_(3)-AIN-MnS composite inclusion.The number of single particle Al_(2)O_(3),MnS,and AIN inclusions is relatively large,and the size of the inclusions is mainly less than 5μm.Thermodynamic calculations have found that Al_(2)O_(3) forms during deoxygenation alloying,AIN begins to precipitate when the solid fraction is O.844,while MnS begins to precipitate in the solid-phase steel after complete solidification.The calculation of two-dimensional lattice mismatch between different inclusions shows that the mismatch degrees of MnS(110)/Al_(2)O_(3)(001),AIN(001)/Al_(2)O_(3)(001),and MnS(100)/AIN(100)are 8.41%,11.66%,and 8.94%,respectively,indicating that Al,Og and AIN can provide heterogeneous nucleation sites for the nucleation of MnS,and Al_(2)O_(3),can also provide heterogeneous nucleation sites for the nucleation of AIN.FactSage 8.2 thermodynamic software calculation is found that when cooled from 1873 K to 373 K,the mass fractions of Al_(2)O_(3),AIN,and MnS inclusions are 0.129%,0.017%,and 0.615%,respectively.The study results can provide theoretical guidance for the formation of inclusions in Fe-Mn-Al-C low density steel during deoxygenated alloying.

关 键 词：Fe-Mn-Al-C低密度钢 夹杂物 热力学 二维晶格错配 异质形核 

分 类 号：TG142.1[一般工业技术—材料科学与工程]