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Indexed by:期刊论文

Date of Publication:2015-08-01

Journal:NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

Included Journals:SCIE、EI、Scopus

Volume:356

Page Number:12-16

ISSN No.:0168-583X

Key Words:High current pulsed electron beam; FV520B steel; Surface treatment; Corrosion; Wear

Abstract:High current pulsed electron beam (HCPEB) surface treatment was conducted on FV520B steel with accelerating voltage 27 kV, pulse duration 2.5 mu s, energy density 5 J/cm(2) and 1-25 pulses. The surface microstructure and element distribution were examined by using scanning electron microscope (SEM), electron probe micro-analysis (EPMA) and X-ray diffraction (XRD) methods. After HCPEB treatments, the surface microstructure became refined and uniform with an average grain size less than 2 mu m and a preferential solidification orientation in (200) direction. The thickness of surface remelted layer was similar to 4 mu m. The initial precipitated particles in surface layer of depth similar to 10 mu m were dissolved into the base matrix and gave a homogenous element distribution. The HCPEB modified surface exhibited an effective improvement in corrosion and wear resistance. The corrosion potential shifted towards positive and the corrosion rate decreased nearly one order of magnitude, while the wear resistance after 25 pulses of HCPEB treatment increased by 3 times as compared with the initial FV520B steel. (C) 2015 Elsevier B.V. All rights reserved.