Wear mechanism and microstructures of Mo-implanted 4Cr5MoV1Si steel

LOW ENERGY ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS

Wear mechanism and microstructures of Mo-implanted 4Cr5MoV1Si steel

YANG Jian-hua，

ZHANG Tong-he

Nuclear Science and Techniques

Vol.15, No.3

pp.155-159

Published in print 01 Jun 2004

CLC：TG174.44

27600

Mo ions extracted from a metal vapor vacuum arc ion source (MEVVA) were implanted into 4Cr5MoV1Si(H13) steel samples with a high implantation dose of 5×10¹⁷cm^-2 and a pulsed ion beam flux of about 300 μA·cm^-2·An optical interference microscope and pin-on-disc apparatus were used to investigate the wear and friction characteristics of the steel. The results from Rutherford backscattering spectroscopy (RBS) and the collision theory demonstrated that the radiation enhanced diffusion gave great influence on the Mo profile. It was observed by X-ray photoelectron spectroscopy (XPS) and grazing-angle X-ray diffraction (GXRD) that carbide of Mo appeared in the doped region for the implantation at 48 kV. The results showed that improvement in the wear resistance of the Mo-implanted steel were mainly due to the formation of Mo₂C in the doped zone and the implantation affected zone underneath. Oxidation resistance of the surface iron and the surface with small crystal grains gave influences on the wear resistance in a way.

Ion implantationWear resistanceSteelMicrostructure

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