WC-Co梯度硬质合金的制备及渗碳对其组织的影响Preparation of WC-Co gradient cemented carbides and effects of carburizing on its microstructure
肖逸锋,贺跃辉,丰平,谢宏,马自省,张丽娟,黄自谦,黄伯云
摘要(Abstract)：
采用光学金相检测、扫描电镜分析、能谱分析等方法对WC-6Co硬质合金渗碳处理后的成分和梯度组织结构进行分析。结果表明:对硬质合金渗碳处理后可形成显微组织和钨、钴含量的梯度分布,其特征是合金表层和次表层的η相已经完全消失,属正常的WC+γ两相组织,合金的芯部依然是含η相的三相组织,中间形成了一个富钴层;碳原子的扩散和液相钴的流动是形成梯度的原因;在各渗碳温度下,合金的梯度结构厚度均随渗碳时间的增加而增加;在渗碳时间和渗碳温度相同的情况下,合金的梯度层厚度均随合金初始总碳含量的增加而增厚。渗碳处理后外表面的WC晶粒可能会产生一定的粗化现象。
关键词(KeyWords)： 硬质合金;渗碳处理;梯度组织
基金项目(Foundation): 国家自然科学基金资助项目(50323008)
作者(Author): 肖逸锋,贺跃辉,丰平,谢宏,马自省,张丽娟,黄自谦,黄伯云
参考文献(References)：
- [1]Lengauera W,Dreyer K.Functionally graded hardmetals[J].Journal of Alloys and Compounds,2002,338(1-2):194-212.
- [2]Rosso M,Ubertalli G,Scavino G.Cemented carbides:WC grades compared to TiC grades[C].Proceedings of the 13th International Plansee Seminar[C].Bildstein H,Eck R,editors.Metallwerk Plansee,Reutte,1993,2:250-263.
- [3]Maximenko A,Roebben G,Van O.Modelling of metal-binder migration during liquid-phase sintering of graded cemented carbides[J].Journal of MaterialsProcessing Technology,2005,160(3):361-369.
- [4]Upadhyaya G S.Materirals science of cemented carbide-an overview[J].Materials and Design,2001,22(6):483-489.
- [5]Akerman J,Fischer U,Hartzell E.Cemented carbide body with extra tough behavior[P].US Patent,No.5453241,1995-09-26.
- [6]Drougge L.Tool of cemented carbide for cutting,punching and nibbling[P].US Patent,No.5235879,1993-08-17.
- [7]Fischer U,Hartzell E,Akerman J.Cemented carbide with a binder phase gradient and method of making the same[P].US Patent,No.4820482,1989-04-11.
- [8]Upadhyaya A,Sarathy D,Wagner G.Advances in alloy design aspects of cemented carbides[J].Materials and Design,2001,22(6):511-517.
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