镁处理18Ni350超高强钢中非金属夹杂物析出热力学分析  

Thermodynamic analysis of non-metallic inclusion precipitation in ultra high strength steel 18Ni350 with magnesium treatment

作　　者：朱杰 刘韶华 冯胜强[3] 明珠[3] 屈天鹏 王德永 ZHU Jie;LIU Shaohua;FENG Shengqiang;MING Zhu;QU Tianpeng;WANG Deyong(Shagang School of Iron and Steel,Soochow University,Suzhou 215021,China;Ningbo Zhenhai Reducer&Variator Manufacturing Co.,Ltd.,Ningbo 315200,China;Ningbo Branch of China Academy of Ordnance Science,Ningbo 315103,China)

机构地区：[1]苏州大学沙钢钢铁学院,江苏苏州215021 [2]宁波市镇海减变速机制造有限公司,浙江宁波315200 [3]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《炼钢》2022年第6期14-21,共8页Steelmaking

基　　金：全国大学生创新创业训练计划项目(202010285032Z);国家自然科学基金资助项目(52174321,51874203)。

摘　　要：针对18Ni350钢中非金属夹杂物的形成过程和条件,基于吉布斯自由能最小原理,利用热力学软件FactSage对该钢种特定成分条件下平衡凝固过程及非金属夹杂物析出热力学行为进行了系统分析,研究成分变化对于析出物析出特征的影响规律。同时采用ASPEX和SEM-EDS对镁处理前后试样中的非金属夹杂物的成分、尺寸分布特征进行了检测分析,镁处理前后试样中夹杂物均以Al_(2)O_(3)-Ti_(2)O_(3)系为主,镁处理可以较好地细化试样中夹杂物,夹杂物主要以MgAl_(2)O_(4)为核心,对于复合夹杂物的形成起到了异质形核作用。研究结果对于指导18Ni350钢中非金属夹杂物的形成和控制具有重要的理论指导。In order to analysis the formation of inclusions in 18Ni350 steel,based on the theory of minimum Gibbs free energy,the equilibrium solidification process and the precipitation behavior of the inclusion particles were investigated by using thermodynamics software FactSage under the specific composition.The effect of composition on precipitation process was studied.Meanwhile,ASPEX and SEM-EDS were used to detect the composition and size distribution of inclusions in the samples before and after magnesium treatment.The inclusions in the samples were mainly Al_(2)O_(3)-Ti_(2)O_(3) series.The inclusions size was refined after magnesium treatment and the inclusions were with MgAl_(2)O_(4) as core normally.It played a heteronucleation role in the formation of complex inclusions.The results provided important theoretical significance for the formation and control of inclusions in the molten pool of 18Ni350 steel.

关 键 词：夹杂物 镁处理 18Ni350钢 热力学分析 

分 类 号：TF762[冶金工程—钢铁冶金]