铌铬白口铸铁中碳化物的形态及其对性能的影响  

Morphologies of Carbides in Nb-Cr White Cast Irons and Their Influence on Properties

作　　者：子澍[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022

出　　处：《现代铸铁》2011年第2期37-42,共6页Modern Cast Iron

摘　　要：介绍了铌铬白口铸铁中的碳化物形态及分布规律。认为铌在白口铸铁中以NbC形式与奥氏体形成共晶体,在共晶体内,NbC呈条形放射状;在铌铸铁中加入钛,TiC先于NbC析出,随后NbC围绕TiC结晶,最终形成团块状,使这种白口铸铁具有更高的抗磨性能和更高的韧性。Morphologies and distribution rule of the carbides in Nb-Cr alloyed white cast irons were introduced.It was considered that the niobium,existing as NbC phase,formed the eutectic with the austenite in the white cast irons and the NbC was of the sprawl shape in the eutectic.When adding Titanium into the niobium cast iron,the TiC precipitated before the NbC,and then the NbC crystallized around the TiC and formed finally a lump-shaped complex carbide that made this type of white cast iron having more higher abrasion-resistance and more higher toughness.

关 键 词：白口铸铁 铌 碳化物 抗磨性能 

分 类 号：TG251.2[金属学及工艺—铸造]