Existing Forms of Lanthanum in Purity Steels  

作　　者：郭锋 林勤 

机构地区：[1]College of Materials Science and engineering,Inner Mongolia University of Technology [2]Physical Chemistry Department,University of Science and Technology Beijing

出　　处：《Journal of Rare Earths》2006年第z2期405-408,共4页稀土学报（英文版）

基　　金：Project supported by the Ministry of Science and Technology of China (2002BA315A-5)

摘　　要：Adding lanthanum to carbon-manganese purity steel, the existing forms of lanthanum were investigated. The results show that enrichment on grain boundary and solid solution in cementite are two kinds of important existing forms of lanthanum relating to micro-alloyed action. As a result of enrichment of lanthanum, the concentration of lanthanum aggregated on somewhere of grain boundary reaches as high as tens of times of its average content although the average content is very low. In addition, lanthanum atoms can replace partial Fe atoms that constitute cementite to form alloyed cementite , the solid solution amount of lanthanum in alloyed cementite increases as the increase of its average content in purity steel.Adding lanthanum to carbon-manganese purity steel, the existing forms of lanthanum were investigated. The results show that enrichment on grain boundary and solid solution in cementite are two kinds of important existing forms of lanthanum relating to micro-alloyed action. As a result of enrichment of lanthanum, the concentration of lanthanum aggregated on somewhere of grain boundary reaches as high as tens of times of its average content although the average content is very low. In addition, lanthanum atoms can replace partial Fe atoms that constitute cementite to form alloyed cementite , the solid solution amount of lanthanum in alloyed cementite increases as the increase of its average content in purity steel.

关 键 词：LANTHANUM purity steel grain boundary enrichment solid solution rare earths 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG146.4[金属学及工艺—金属材料]