Mg-Zr处理对FH40级船板钢铸态夹杂物特征的影响  

Effects of Mg-Zr Combined Treatment on Characteristics of Inclusions in FH40 Ship-Building Steel Ingots

作　　者：李小兵[1] 王德永[1] 刘承军[1] 姜茂发[1] 

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2014年第4期529-533,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50904017);中央高校基本科研业务费专项资金资助项目(N120602005);中国博士后科学基金资助项目(2011M500823)

摘　　要：采用定量金相及SEM-EDS手段对Mg,Zr及Mg-Zr处理FH40级船板铸钢中夹杂物粒径分布、平均粒径、总数量、总面积及成分、形貌等特征进行系统研究.结果表明,Mg,Zr及Mg-Zr处理后铸锭夹杂物平均粒径下降,夹杂物总数量增加.Mg的质量分数为0.024%时,夹杂物中MgO平均质量分数为12.57%,变质不充分;Mg的质量分数增加至0.072%后,夹杂物中MgO平均质量分数为35.58%,实现了氧化铝向MgO·Al2O3的充分变质,且夹杂物粒径明显减小.0.03%Zr处理后,铸锭夹杂物以Al2O3+MnS,Al-Zr-O+MnS为主;低Mg+高Zr,高Mg+低Zr,高Mg+高Zr处理炉次试验钢铸锭中均发现了含Zr夹杂物,其中高Mg+高Zr炉次形成了ZrO2夹杂,该类夹杂物被MgO·Al2O3包裹,团聚现象明显.The characteristics such as particle size distribution, average particle size, total amount and chemical composition of FH40 ship-building steels formed by Mg, Zr, Mg-Zr combined treatment were investigated by the quantitative metallographic and SEM-EDS methods. The results showed that the average particle size decreased while the total amount of inclusions increased after Mg, Zr, Mg-Zr treatment. With 0. 024% Mg addition, the average mass fraction of MgO was 12.57% in the inclusions, which was not fully modified; With 0. 072% Mg addition, the average mass fraction of MgO was 35.58% , in the inclusions which meant that A1203 completely translated into MgO.Al2O3, and the size of inclusions decreased obviously. With 0.03% Zr addition, the main inclusions of the ingot were mainly A1203 ＋ MnS, A1-Zr-O ＋ MnS. The Zr-containing inclusions were all found after Mg-Zr combined treatment with the amount of the Mg and Zr additions changed as follow low Mg ＋ high Zr, high Mg ＋ low Zr and high Mg ＋ high Zr. Especially, ZrO2 inclusions wrapped with MgO. A1203were found in the high Mg ＋ high Zr treated steel with the apparent tendency to be aggregated.

关 键 词：船板钢 夹杂物 Mg ZR 变质 

分 类 号：TF77[冶金工程—钢铁冶金]