摘要
在GCr15轴承钢扫描电镜观察中发现有两类复合TiN夹杂物,分别为:TiN-MnS和TiN-MgO-MgAl_2O_4-MnS。热力学计算表明,GCr15轴承钢中TiN夹杂物在固液两相区析出,MnS在固相区析出,Mg元素部分来源于炉衬中MgO被钢液中溶解的碳侵蚀还原,[Mg]与[O]将已经形核的Al2O3改质为MgAl_2O_4。TiN-MgOMgAl_2O_4-MnS的析出顺序依次为:MgAl_2O_4、MgO、TiN、MnS。MgO可作为TiN的形核质点;MgAl_2O_4若作为MgO、TiN、MnS的形核质点,取决于其周围元素的类型以及析出温度。
From the scanning electron microscope observation of GCr15 bearing steel,two kinds of complex TiN-containing inclusions were found.One is the TiN–MnS system;the other the TiN-MgO-MgAl2O4-MnS system.Thermodynamic calculations reveal that TiN inclusion in GCr15 bearing steel is precipitated in solidliquid two-phase region,whereas MnS is precipitated in solid phase region.The elemental Mg is partly produced from reduction reaction of the MgO eroded from lining by the dissolved carbon in molten steel.[Mg]and[O]transform the nucleated Al2O3 inclusion into MgAl2O4.The precipitation order in the TiN-MgO-MgAl2O4-MnS system is in turn as MgAl2O4,MgO,TiN,and MnS.MgO can be used as the nucleation site for TiN,while MgAl2O4 as the nucleation site for MgO,TiN and MnS,depending on the type of elements surrounding MgAl2O4 and the precipitation temperature.
作者
田钱仁
马骞
尚德礼
雷洪
王国承
TIAN Qianren;MA Qian;SHANG Deli;LEI Hong;WANG Guocheng(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;State Key Laboratory of Marine Equipment and Applications,Anshan 114021,China;Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110004,China;Key Laboratory of Chemical Metallurgy Engineering Liaoning Province,University of Science andTechnology Liaoning,Anshan 114051,China)
出处
《辽宁科技大学学报》
CAS
2018年第3期173-179,共7页
Journal of University of Science and Technology Liaoning
基金
鞍钢海洋装备用金属材料及其应用国家重点实验室-辽宁科技大学联合基金资助项目计划(SKLMEA-USTL-201706)
东北大学材料电磁过程研究教育部重点实验室开放课题(NEU-EPM-001)
