Effect of cerium on the cleanliness of spring steel used in fastener of high-speed railway

作     者：刘延强 王丽君 周国治 LIU Yanqiang;WANG Lijun;CHOU Kuochih

作者机构：State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Department of Physical ChemistrySchool of Metallurgical and Ecological Engineering University of Science and Technology Beijing 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2014年第32卷第8期

页      面：759-766页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by National Natural Science Foundation of China(51104013 51174022) the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry(44),Beijing Higher Education Young Elite Teacher Project(0349) 

主　　题：cerium inclusions residual elements spring steel high-speed railway rare earths 

摘      要：The effects of Ce addition on the quantity, size, distribution of inclusions and the content of oxygen, sulfur and other hazardous residual elements in spring steel used as fastener in high speed railway were investigated by metallographic examination, SEM-EDS and composition analysis. The results indicated that the contents of oxygen decreased with the addition of Ce （[Ce]〈0.1%） and the content of sulfur continually decreased with increasing content of Ce （[Ce]〈1.2%）. However, with the further increase of Ce element addition, the content of [O] and T[O] began to increase. The content of Ce corresponding to the lowest [O] and T[O] lied in the range of 0.10%-0.13%and 0.045%-0.065%, respectively. The addition of Ce in spring steel resulted in the formation of rare earth oxides/oxysulfides and decreased the size of inclusions to less than 3μm in globular or spheroid shape. Moreover, the residual harmful elements （As, P, Pb and Sn） were found to exist in the Ce-containing inclusions, which had proved that the Ce addition could capture the residual elements and suppress their precipitation behaviors in the grain boundary.