Nb在灰铸铁中的存在形态  

Existing Morphologies of Niobium in Cast Irons

作　　者：朱洪波[1] 孙小亮[1] 闫永生[1] 华勤[1] 翟启杰[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《现代铸铁》2011年第2期33-36,共4页Modern Cast Iron

基　　金：中信-CBMM铌钢研究与开发基金(No.036);上海大学研究生创新基金(No.SHUCX102233)的支持

摘　　要：用附带能谱的扫描电镜研究了Nb在灰铸铁中的存在形态,结果显示:少量Nb以原子形式固溶于基体,绝大多数Nb形成富Nb相镶嵌在基体上面;富Nb相形态丰富,有块状(包括方块状和三角形)、不规则形状(包括X型、Y型)以及条棒状;在富Nb相形成过程中,TiN可能作为异质核心,因而对富Nb相的形成起了促进作用。The existing morphologies of niobium in cast irons were investigated by using SEM with spectroscopy.The result showed that only a little quantity of niobium dissolved as the atom type in the matrix and formed solid solution,however most of the niobium formed the Nb-rich phase embedding into the matrix;the Nb-rich phase had a lots of morphologies such as the clump shape（including square and triangle shape）,abnormal shape（including X type and V type）,and bar shape.TiN could act as the heterogeneous crystal nucleus in the forming process of the Nb-rich phase and,therefore,it had the effect to promote the formation of the Nb-rich phase.

关 键 词：灰铸铁 NB 富Nb相 存在形态 

分 类 号：TG251[金属学及工艺—铸造]