(V，Nb)C增强铁基复合材料的原位合成及微观组织研究  

Research on In- situ Synthesis of (V,Nb) C Reinforced Iron Matrix Composite and Its Microstructure

作　　者：鲜勇[1] 王一三[2] 丁义超[3] 王静[3] 

机构地区：[1]攀钢集团研究院有限公司,钒钛资源综合利用国家重点实验室,四川攀枝花617000 [2]四川大学制造科学与工程学院,四川成都610065 [3]成都电子机械高等专科学校,四川成都610031

出　　处：《钢铁钒钛》2012年第6期22-25,30,共5页Iron Steel Vanadium Titanium

摘　　要：采用粉末冶金的方法原位合成一种(V,Nb)C增强铁基复合材料,其烧结密度在1 360℃达到7.07 g/cm3。使用X射线衍射(XRD),扫描电镜(SEM)对微观组织进行分析,结果表明:NbC在高温析出过程中吸附在VC颗粒表面,逐渐向内渗透,形成(V,Nb)C固溶体,能够抑制硬质相颗粒的长大。Nb/V摩尔比为0.4时,Nb能有效地抑制合金元素在碳化物中的固溶,使得V、Mo、Cr元素大量进入奥氏体中,从而在随炉冷却的条件下得到贝氏体加残余奥氏体的基体组织。Insitu synthesized （ V, Nb） C reinforced iron matrix composites with sintering density of 7.07 g . cm-3 at 1 360 ℃ were prepared by powder metallurgy process. The microstructure of the composites were investigated by Xray diffraction （XRD）and scanning results show that NbC absorbs on the surface of VC particles electron microscope （SEM） respectively. The during high temperature precipitation process and then （ V, Nb） C solid solution that could inhibit the growth of hard phase particles is formed by in ward penetration of NbC. When the molar ratio of Nb/V was 0.4, Nb could effectively inhibit solid solu tion of alloy elements in carbides, bringing a large number of V, Mo and Cr into austenite, and thus the iron matrix comprising of bainite and residual austenite was obtained with furnace cooling.

关 键 词：(V Nb)C增强铁基复合材料 粉末冶金 原位合成 微观组织 

分 类 号：TB331[一般工业技术—材料科学与工程]