Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第17卷    第1期    总第94期    2007年1月

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文章编号:1004-0609(2007)01-0039-06
碳含量对缺碳硬质合金组织和性能的影响
肖逸锋1, 2, 贺跃辉1, 丰 平1, 谢 宏1, 3, 张丽娟1, 黄自谦1, 黄伯云1

(1. 中南大学 粉末冶金国家重点实验室,长沙 410083;
2. 湘潭大学 机械工程学院,湘潭 411105;
3. 株洲钻石切削刀具股份有限公司,株洲 412007
)

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。

 

关键字: 硬质合金;碳含量;η相;显微组织

Effects of carbon content on microstructure and
properties of carbon-deficient cemented carbides
XIAO Yi-feng1, 2, HE Yue-hui1, FENG Ping1, XIE Hong1, 3,ZHANG Li-juan1, HUANG Zi-qian1, HUANG Bai-yun1

1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;
2. School of Mechanical Engineering, Xiangtan University,Xiangtan 411105, China;
3. Zhuzhou Cemented Carbide Cutting Tools Co. Ltd.,Zhuzhou 412000, China

Abstract: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 carbon- deficient 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.

 

Key words: cemented carbides; carbon content; η phase; microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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