碳含量对缺碳硬质合金组织和性能的影响  

Effects of carbon content on microstructure and properties of carbon-deficient cemented carbides

作　　者：肖逸锋[1] 贺跃辉[1] 丰平[1] 谢宏[1] 张丽娟[1] 黄自谦[1] 黄伯云[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室

出　　处：《中国有色金属学报》2007年第1期39-44,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50323008)

摘　　要：通过配制不同碳含量的WC-6Co缺碳硬质合金,采用X射线衍射、光学金相、显微硬度、钴磁和TRS等分析方法,对比研究碳含量对低压烧结缺碳硬质合金的显微组织和性能的影响。结果表明:碳含量影响合金中η相的类型、含量、分布、WC的形状以及合金的性能;Co3W3C相出现在缺碳程度相对较小的合金中,其含量随碳含量的增加而增大,而Co6W6C相与之相反;合金中的η相总量随碳含量的增大而减少;随着缺碳程度的增加,合金中η相的分散均匀性变差,并且η相趋向于成大块状;WC大多呈现多角特征;合金的密度和维氏硬度随着碳含量的增加,先大幅度增加后缓慢减小,碳含量为5.2%(质量分数)时均出现最大值,合金的钴磁和横向断裂强度随着碳含量的增加而增加。Effects of carbon content on microstructure and properties of WC-6Co carbon-deficient cemented carbides with carbon content from 5.0% to 5.6% prepared by sinter-HIP were analyzed by X-ray diffractometry, optical microscopy, Vickers hardness analysis, cobalt magnetic analysis, TRS and so on. The results show that, in carbondeficient cemented carbides, carbon content affects the type, amount and distribution of η phase, WC shape and properties of alloys. Co3W3C phase appears in alloys with relative lower degree of carbon-deficient and whose amount increase with increasing carbon content, whereas Co6W6C phase varies reversely. The total amount of η phase decreases with increasing carbon content. With the increase of degree of carbon-deficient, the homogeneity of η phase distribution decreases, η phase tends to become clump shape and WC mostly maintains multangular character. In the field of research, the density and Vickers hardness of alloys substantially increase then slowly decrease with increasing carbon content and both appear maximum in 5.2% carbon（mass fraction）, the cobalt magnetic and TRS of alloys increase with increasing carbon content.

关 键 词：硬质合金 碳含量 Η相 显微组织 

分 类 号：TF125.3[冶金工程—粉末冶金] TG135[冶金工程—冶金物理化学]