稀土Ce含量对S355NL低合金钢夹杂物及铸态组织与硬度的影响  

Effect of Ce content on inclusions and as-cast microstructure and hardness of S355NL low alloy steel

作　　者：杨建栋 谢碧君[1,2] 徐斌[1,2] 孙明月[1,2] 李殿中[1] Yang Jiandong;Xie Bijun;Xu Bin;Sun Mingyue;Li Dianzhong(Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang Liaoning 110016,China;CAS Key Laboratory of Nuclear Materials and Safety Evaluation,Institute of Metal Research,Chinese Academy of Sciences,Shenyang Liaoning 110016,China;School of Mechanical Engineering and Automation,Dalian Polytechnic University,Dalian Liaoning 116034,China)

机构地区：[1]中国科学院金属研究所,沈阳材料科学国家研究中心,辽宁沈阳110016 [2]中国科学院金属研究所,中国科学院核用材料与安全评价重点实验室,辽宁沈阳110016 [3]大连工业大学机械工程与自动化学院,辽宁大连116034

出　　处：《金属热处理》2024年第12期122-128,共7页Heat Treatment of Metals

基　　金：国家重点研发计划(2022YFB3705501,2018YFA0702900);国家自然科学基金(52173305,52101061,52233017,52203384)。

摘　　要：在S355NL低合金钢中添加高纯稀土Ce元素,研究不同Ce含量对高洁净度S355NL低合金钢夹杂物及铸态组织和硬度的影响。利用扫描电镜、光学显微镜和维氏硬度计对其夹杂物的类型、尺寸和形状,以及铸态组织和硬度进行测试分析。结果表明:稀土Ce添加量为0.0011%~0.0049%时,使S355NL低合金钢中形状不规则的大尺寸Al_(2)O_(3)和MnS夹杂物改性为细小球状的稀土夹杂物;当添加量为0.0011%~0.0049%,稀土Ce首先与O、S元素反应形成细小的球状稀土氧硫化物;随着稀土Ce含量的增加,过量稀土Ce将与As、P元素反应形成大尺寸的不规则稀土夹杂物。此外,稀土Ce的添加可细化S355NL低合金钢的铸态枝晶,并提升S355NL低合金钢的硬度。综合考虑夹杂物改性及硬度优化,S355NL低合金钢的最佳稀土Ce添加量为0.0011%~0.0049%。Effects of adding different contents high-purity rare earth Ce element on the inclusions,as-cast microstructure and hardness of high-purity S355NL low alloy steel were investigated.The types,sizes and shapes of inclusions,as well as the as-cast microstructure and hardness were analyzed and evaluated by using scanning electron microscopy,optical microscopy,and Vickers hardness testing.The results indicate that with the Ce addition ranging from 0.0011%to 0.0049%,the irregularly shaped large Al_(2)O_(3)and MnS inclusions in the S355NL low alloy steel are modified into fine spherical rare earth inclusions.When Ce is added at levels between 0.0011%and 0.0049%,it initially reacts with O and S to form small spherical rare earth oxysulfides.However,with the increase of Ce content,excess Ce can react with As and P,leading to larger irregular rare earth inclusions.Additionally,the incorporation of Ce refines the dendritic structure of the S355NL low alloy steel and enhances its hardness.Considering both the inclusion modification and hardness optimization,the optimal range for Ce addition in the S355NL low alloy steel is determined to be 0.0011%to 0.0049%.

关 键 词：S355NL低合金钢 稀土Ce 夹杂物 铸态组织 硬度 

分 类 号：TG142.7[一般工业技术—材料科学与工程]