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Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:金属学报

Affiliation of Author(s):物理学院

Volume:39

Issue:09

Page Number:926-931

ISSN No.:0412-1961

Abstract:The surface of W6Mo5Cr4V2 high-speed steel (HSS) was treated by high Intensity pulsed ion beam (HIPIB) for 1, 3 and 5 pulses, which consists mainly of Cn+ (70%) and H+ (30%). The bombarded conditions are as follows: a high beam current density of 160 A/cm(2), acceleration voltage of 250 kV, pulse duration of 80-100 ns, energy density of 3-4 J/cm(2). The structure and composition changes of the HSS before and after irradiation were analyzed by using XRD, SEM and EPMA. The results show that the initial martensite in the surface layer is changed into austenite, and craters are formed on the surface. The crater formation is explained using the raindrop model, supported by the enriched elements from the beam near the center. Due to the compress stress wave induced by the bombardment, the microhardness is significantly increased in a depth range of up to 200 mum. The wear resistance is improved by a factor of 2, and the corrosion resistance is also slightly increased.

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