稀土元素在含残余砷、锡09Cr2AlMoRE钢中的作用  

Effect of Rare Earths on 09Cr2AlMoRE Steel with Residual Elements Arsenic and Tin

作　　者：吴铖川[1] 成国光[1] 田俊[1] 谢有[1] 

机构地区：[1]钢铁冶金新技术国家重点实验室,北京科技大学冶金与生态工程学院,北京100083

出　　处：《中国稀土学报》2013年第5期597-604,共8页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(50734008)

摘　　要：对加稀土前后09Cr2AlMoRE钢取样分析化学成分,制备金相样用SEM-EDS研究了钢中析出物特征,制备透射电镜(TEM)试样通过TEM研究元素的晶界偏聚,并用热力学计算了稀土Ce,La,S和残余元素As反应固定残余元素As的可能性。研究结果表明:在低氧、硫的条件下,稀土镧可以和09Cr2AlMoRE钢中较低含量的砷(130×10-6)作用生成镧砷金属间化合物;铈、镧主要是通过形成稀土砷硫夹杂物固定钢中残余元素砷。另外,在本实验条件下稀土元素(64×10-6)只有很微量的偏聚在晶界,残余元素As不在晶界偏聚。The chemical compositions for the 09Cr2A1MoRE steel before and after adding rare earth were analyzed. The characteristics of inclusions were observed by SEM-EDS after prepared the metallo- graphic specimens and the segregation of the elements at the grain boundary was studied by transmission e- lectron microscopy （TEM）. And the possibility of the reactions of rare earth Ce, La, S and residual element As to improve the harm influence of the residual ele- ments As on the steel properties were calculated by u- sing thermodynamic analysis. The results showed that lanthanum can react with low content of arsenic （ 130 ppm ） to form role lanthanum-arsenic intermetallic compound, and the arsenic was mainly fixed by the reaction with cerium, lanthanum and sulfur. In addi- tion, under the present experimental conditions, rare earth elements （64 ppm） were only a trace of partial segregated in grain boundary, and residual element ar- senic （130 ppm） was not in ry. Above all, in the low tions, the mechanism of rare segregated grain bounda- oxygen and sulfur condi- earth improving the harm influence of the residual elements As on 09Cr2AlMoRE steel are mainly that the fixation of RE and S on residual elements As is effectively reducing the solution quantity of residual elements As in ma- trix, which results in the segregation eliminating of re- sidual elements As at the grain boundary

关 键 词：CE LA 残余元素As 热力学 

分 类 号：TG142.1[一般工业技术—材料科学与工程]