Improvement of surface microhardness and wear resistance of WC/Co hard alloy by high current pulsed electron beam irradiation

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• 作者：Shengzhi Hao ; Yang Xu ; Yue Zhang ; Limin Zhao
• 关键词：WC/Co hard alloy ; High current pulsed electron beam ; Microstructure ; Microhardness ; Wear
• 刊名：International Journal of Refractory Metals and Hard Materials
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：41
• 期：Complete
• 页码：553-557
• 全文大小：1205 K

文摘

High current pulsed electron beam (HCPEB) irradiation was conducted on a WC/Co hard alloy. The modified surface microstructure was characterized with methods of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The surface microhardness and wear resistance were measured. Under HCPEB irradiations, the surface layer was melted and the refined WC particles dissolved with Co bonding material. A covering layer composed of a mixture of nano-grained WC_1 ? x and Co₃W₉C₄ phases was formed on the modified surface with a thickness of ~ 1 ¦Ìm. After 20 pulses of HCPEB irradiation, the surface microhardness of YG6X hard alloy was increased to 2430 HK and the wear rate reduced drastically to one eighth of the initial state.