工程科学学报，第41卷，第6期：763-771,2019年6月 Chinese Journal of Engineering,Vol.41,No.6:763-771,June 2019 DOI:10.13374/j.issn2095-9389.2019.06.008:http://journals.ustb.edu.cn 稀土一镁复合处理对GCr15轴承钢中夹杂物的影响 常立忠”，高岗2》，郑福舟”，施晓芳)区 1)安徽工业大学治金工程学院，马鞍山2430022)中钢集团马鞍山矿山研究院有限公司，马鞍山243000 ☒通信作者，E-mail:cz1997@163.com 摘要为了尽可能的去除钢中大颗粒的夹杂物，在实验条件下通过向GC15轴承钢中添加适量镁、稀土对夹杂物进行改性，并 利用As即x夹杂物自动分析仪和扫描电镜对钢中改性后的夹杂物尺寸、类型、形貌等进行了观察、分析，研究了稀土一镁复合处理 对夹杂物的影响规律.研究结果表明，对轴承钢中加入微量镁处理，可将未进行镁处理钢中的MnS-Al2O3、MS、A2O3夹杂改性 为以含硫、镁复合夹杂物为主，同时包含少量A山，0，、镁铝尖晶石夹杂.进一步采用稀土一镁复合处理后，钢中的夹杂物转变为主 要以含Re-SO夹杂物为主，AL,O,MnS、镁铝尖晶石夹杂逐步消失，且夹杂物成球状分布，绝大多数夹杂物在5um以下.稀士- 镁复合处理轴承钢后，10μm以上的大颗粒夹杂物大大降低，钢中的夹杂物明显得到细化。钢中镁含量不变时，随着稀土含量的 增加，大颗粒夹杂物比例明显下降.而在稀土含量相近的情况下，增加钢中的镁含量也有利于大颗粒夹杂物的去除.稀土一镁的 相互作用进一步促进了夹杂物的细化. 关键词轴承钢：稀土：镁：夹杂物：洁净钢 分类号TF769.2 Effect of rare earth and magnesium complex treatment on inclusions in GCrl5 bearing steel CHANG Li-zhong,GAO Gang,ZHENG Fu-zhou,SHI Xiao-fang 1)School of Metallurgy Engineering,Anhui University of Technology,Maanshan 243002,China 2)Ma'anshan Institute of Mining Research Co.,Lid.,Sinosteel Corporation,Maanshan 243000,China Corresponding author,E-mail:clz1997@163.com ABSTRACT Bearing steel has very strict requirements on the size,shape,and quantity of non-metallic inclusions.Even if the total ox- ygen content in steel is kept at very low levels,large inclusions are not completely removed.These large inclusions have a decisive effect on the fatigue life of bearing steel.To remove the large inclusions in the bearing steel as much as possible,the effect of rare earth and magnesium duplex treatment on inclusions in GCrl5 bearing steel was investigated by adding moderate rare earth and magnesium to liquid steel under experimental conditions.The size,composition,and morphology of the inclusions were observed by combining Aspex inclusion automatic analysis technology and scanning electron microscope.The experimental results show that the inclusions in steel before modifi- cation are mainly composed of MnS-AlO,MnS,and Al20,and the inclusions are modified to be composed of a large number of com- pound inclusions containing sulfur and magnesium and a small amount of Al,O,and magnesia alumina spinel after adding trace magnesium to steel.After complex treatment by rare earth and magnesium,the inclusions are mainly composed of Re-0-S.Al,O,,MnS,and mag- nesia alumina spinel vanish gradually.The inclusions are spherically distributed,and most of them have diameter less than 5 um.Inclu- sions with diameters greater than 10 um are greatly reduced.Thus,the inclusions in GCr15 bearing steel are obviously refined after rare earth and magnesium complex treatment.When the magnesium content in the steel remains unchanged,the proportion of large particle in- 收稿日期：201806-16 基金项目：国家自然科学基金资助项目(51574001,51504001)：钢铁治金新技术国家重点实验室开放基金资助项目(KF195):安徽省高校优秀青 年人才支持计划资助项目(ygZD2017034)工程科学学报，第 41 卷，第 6 期: 763--771，2019 年 6 月 Chinese Journal of Engineering，Vol． 41，No． 6: 763--771，June 2019 DOI: 10． 13374 /j． issn2095--9389． 2019． 06． 008; http: / /journals． ustb． edu． cn 稀土--镁复合处理对 GCr15 轴承钢中夹杂物的影响 常立忠1) ，高 岗1，2) ，郑福舟1) ，施晓芳1)  1) 安徽工业大学冶金工程学院，马鞍山 243002 2) 中钢集团马鞍山矿山研究院有限公司，马鞍山 243000  通信作者，E-mail: clz1997@ 163． com 摘 要 为了尽可能的去除钢中大颗粒的夹杂物，在实验条件下通过向 GCr15 轴承钢中添加适量镁、稀土对夹杂物进行改性，并 利用 Aspex 夹杂物自动分析仪和扫描电镜对钢中改性后的夹杂物尺寸、类型、形貌等进行了观察、分析，研究了稀土--镁复合处理 对夹杂物的影响规律． 研究结果表明，对轴承钢中加入微量镁处理，可将未进行镁处理钢中的 MnS--Al2O3、MnS、Al2O3 夹杂改性 为以含硫、镁复合夹杂物为主，同时包含少量 Al2O3、镁铝尖晶石夹杂． 进一步采用稀土--镁复合处理后，钢中的夹杂物转变为主 要以含 Ｒe--S--O 夹杂物为主，Al2O3、MnS、镁铝尖晶石夹杂逐步消失，且夹杂物成球状分布，绝大多数夹杂物在 5 μm 以下． 稀土-- 镁复合处理轴承钢后，10 μm 以上的大颗粒夹杂物大大降低，钢中的夹杂物明显得到细化． 钢中镁含量不变时，随着稀土含量的 增加，大颗粒夹杂物比例明显下降． 而在稀土含量相近的情况下，增加钢中的镁含量也有利于大颗粒夹杂物的去除． 稀土--镁的 相互作用进一步促进了夹杂物的细化． 关键词 轴承钢; 稀土; 镁; 夹杂物; 洁净钢 分类号 TF769. 2 收稿日期: 2018--06--16 基金项目: 国家自然科学基金资助项目( 51574001，51504001) ; 钢铁冶金新技术国家重点实验室开放基金资助项目( KF19-05) ; 安徽省高校优秀青 年人才支持计划资助项目( gxyqZD2017034) Effect of rare earth and magnesium complex treatment on inclusions in GCr15 bearing steel CHANG Li-zhong1) ，GAO Gang1，2) ，ZHENG Fu-zhou1) ，SHI Xiao-fang1)  1) School of Metallurgy Engineering，Anhui University of Technology，Maanshan 243002，China 2) Ma'anshan Institute of Mining Ｒesearch Co． ，Ltd． ，Sinosteel Corporation，Ma !anshan 243000，China  Corresponding author，E-mail: clz1997@ 163． com ABSTＲACT Bearing steel has very strict requirements on the size，shape，and quantity of non-metallic inclusions． Even if the total ox￾ygen content in steel is kept at very low levels，large inclusions are not completely removed． These large inclusions have a decisive effect on the fatigue life of bearing steel． To remove the large inclusions in the bearing steel as much as possible，the effect of rare earth and magnesium duplex treatment on inclusions in GCr15 bearing steel was investigated by adding moderate rare earth and magnesium to liquid steel under experimental conditions． The size，composition，and morphology of the inclusions were observed by combining Aspex inclusion automatic analysis technology and scanning electron microscope． The experimental results show that the inclusions in steel before modifi￾cation are mainly composed of MnS--Al2O3，MnS，and Al2O3，and the inclusions are modified to be composed of a large number of com￾pound inclusions containing sulfur and magnesium and a small amount of Al2O3 and magnesia alumina spinel after adding trace magnesium to steel． After complex treatment by rare earth and magnesium，the inclusions are mainly composed of Ｒe--O--S． Al2O3，MnS，and mag￾nesia alumina spinel vanish gradually． The inclusions are spherically distributed，and most of them have diameter less than 5 μm． Inclu￾sions with diameters greater than 10 μm are greatly reduced． Thus，the inclusions in GCr15 bearing steel are obviously refined after rare earth and magnesium complex treatment． When the magnesium content in the steel remains unchanged，the proportion of large particle in-