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论文类型：期刊论文

发表时间：2013-11-01

发表刊物：INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS

收录刊物：SCIE、EI、Scopus

卷号：41

页面范围：553-557

ISSN号：0263-4368

关键字：WC/Co hard alloy; High current pulsed electron beam; Microstructure; Microhardness; Wear

摘要：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 WC1 - x and Co3W9C4 phases was formed on the modified surface with a thickness of similar to 1 mu m. 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. (C) 2013 Elsevier Ltd. All rights reserved.