铸造烧结Fe-VC表层复合材料的显微组织研究  

Study on Microstructure of Fe-VC Surface Composites Synthesized by Cast-sintering Technique

作　　者：郑淼[1,2] 郑开宏[2] 王娟[2] 陈和兴[2] 杨扬[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]广州有色金属研究院金属成型与加工技术研究所,广东广州510650

出　　处：《铸造技术》2013年第12期1659-1662,共4页Foundry Technology

基　　金：国家高技术研究发展计划(863计划)资助项目2013AA031203);广东省战略性新兴产业核心技术攻关项目(2012A090100018)

摘　　要：以含有V、Cr、C、Fe、Ni元素的金属粉末混合物为原料,采用铸造烧结法,在铸件表面合成了VC颗粒增强铁基复合材料。用XRD,SEM对复合材料显微组织进行了分析,并从热力学上对V的碳化反应进行了研究。结果表明:在铸造烧结过程中,复合层发生了钒铁的分解和增强颗粒的原位生成以及组织的致密化,增强颗粒圆整,分布均匀且与基体结合良好;复合层与母体组织为冶金结合,并伴随有扩散现象;应用热力学原理对原位反应过程进行热力学计算,证明了在1773 K浇注温度下生成的增强颗粒为V8C7,与XRD一致。Using the metal powder mixture containing V, Cr, C, Fe, Ni elements as raw material, Fe-based composites reinforced with VC particles was obtained on the surface of the castings by cast-sintering technique. The microstructure of the composites was analyzed by SEM, XRD. The mechanism of VC produced by in-situ synthesis was studied by thermodynamics principles. The results show that the reactions occurred in the compound material layer include the decomposition of ferrovanadium powder, the in-situ generating of reinforcing particles and the densification of microstructure during cast-sintering process. The reinforcing particles which are with regular shape and uniform distribution have a good bonding with the matrix; Metallurgical bonding can be obtained between the compound material layer and the matrix, and accompanied with diffusion; The thermodynamic calculation results on the in-situ reaction show that the possible reaction products produced by in-situ synthesis at 1 773 K are V8C7, which are consistent with the XRD result.

关 键 词：铁基复合材料 铸造烧结 原位合成 V8C7 

分 类 号：TB333[一般工业技术—材料科学与工程]