Wear mechanism and microstructures of Mo-implanted 4Cr5MoV1Si steel

Wear mechanism and microstructures of Mo-implanted 4Cr5MoV1Si steel 1 2 first-author 2 Department of Physics, Nantong Institute of Technology, Nantong 226007; Department of Physics, Nantong Institute of Technology, Nantong 226007; Radiation Beam and Materials Engineering Lab, Beijing Normal University, Beijing 100875 Radiation Beam and Materials Engineering Lab, Beijing Normal University, Beijing 100875 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 5×10 17 cm -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 Mo 2 C 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 implantation Wear resistance Steel Microstructure References Wolf G K . Surf Coat and Tech , 1996 , 83 : 1 Surf Coat and Tech Stachowiak G B , Stachowiak G W , Evans P . Wear , 2000 , 241 : 220 Wear Manory R R , Mollica S , Ward L et al . Surf Coat and Tech , 2002 , 115 : 136 Surf Coat and Tech Umehara N , Moon B , Kako K . Wear , 1998 , 218 : 210 Wear Sharkeev Y , Didenko A , Kozlov E . Surf Coat and Tech , 1994 , 5 : 92 Surf Coat and Tech Brown I G , Feinberg B , Galvin J E . J Appl Phys , 1988 , 63 : 4899 J Appl Phys Zhang T , Wu Y , Deng Z et al . Chin Phys Lett , 2002 , 19 : 825 Chin Phys Lett Schulz F et al . Rad Eff , 1976 , 29 : 31 Rad Eff Yang J , Zhang T . Mater Sci Eng , 2003 , A362 : 200 Mater Sci Eng Zhang T , Wu Y , Ma F et al . Nucl Sci Tech (China) , 2001 , 12 : 16 Nucl Sci Tech (China) Singer I L , Jeffries R A . Mat Res Soc Symp Proc , 1984 , 27 : 667 Mat Res Soc Symp Proc TG174.44 Supported partly by the National Natural Science Foundation of China (No. 59671051) and by the Natural Science Foundation of Nantong Institute of Technology (No. 200347) 2003-01-22 2004-06-01 2021-01-19 2004 Nuclear Science and Techniques 03 15