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论文类型：期刊论文

发表时间：2017-03-01

发表刊物：VACUUM

收录刊物：SCIE、EI、Scopus

卷号：137

页面范围：119-124

ISSN号：0042-207X

关键字：High intensity pulsed electron beam; Cemented carbide; Nickel; Microhardness; Wear resistance; Friction coefficient

摘要：Surface characterization of WC-13Ni cemented carbide irradiated by high intensity pulsed electron beam (HIPEB) at energy density of 3-34 J/cm(2) with 10 pulse was investigated by using scanning electron microscope (SEM), X-ray diffraction (XRD), electron probe microanalysis (EPMA) and Vickers tester. The surface tribological properties were measured by a block-on-ring tribometer. It was found that the HIPEB irradiation induced surface remelting and Ni selective ablation, resulting in the phase transformation from hexagonal alpha-WC to metastable phases, i.e. face centered cubic beta-WC1-x and hexagonal alpha-W2C, and the formation of some defects such as microcracks and blow holes, and then the microstructural changes provided hardening and softening in different degree on the irradiated surface. The friction coefficient of irradiated samples reduced from 0.8 of the original WC-13Ni cemented carbide to 0.5, and the specific wear rate decreased to 3.8 x 10(-7) mm(3)/Nm from 1.2 x 10(-6) mm(3)/Nm, showing the surface tribological properties of HIPEB irradiated WC-13Ni cemented carbide is not only related to the surface hardening, but also with the surface microstructure. (C) 2016 Elsevier Ltd. All rights reserved.