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Indexed by:期刊论文

Date of Publication:2019-01-01

Journal:INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS

Included Journals:SCIE、Scopus

Volume:78

Page Number:233-239

ISSN No.:0263-4368

Key Words:High current pulsed electron beam; Cemented carbide; Composite microstructure; Surface modification; Wear resistance

Abstract:The surface microstructure evolution and its effect on mechanical property was systematically investigated for YG10X cemented carbide irradiated by high current pulsed electron beam (HCPEB) with a steady energy density of 6 J/cm(2) and different pulse numbers. The surface morphology was characterized by optical microscopy (OM), three-dimensional laser scanning microscopy (LSM) and scanning electron microscopy (SEM); and energy dispersive spectrometry (EDS) and X-ray diffractometry (XRD) was carried out to reveal the elemental profile and phase transformation under HCPEB irradiation. During the HCPEB-induced rapid re-melting and re-solidification process, the redistribution of chemical elements, grain refinement and phase transformation WC(hex) -> graphite + beta-WC1-x(fcc) occurred. Moreover, the preferential precipitation of nano-grained graphite in the Co-rich region of melt pool was discovered. The drastic structural change led to a maximum similar to 34% increment of the initial state in microhardness and about a two third reduction in friction coefficient.