Rotational fretting which exist in many engineering applications has incurred enormous economic loss. Thus, accessible methods are urgently needed to alleviate or eliminate damage by rotational fretting. Surface engin...Rotational fretting which exist in many engineering applications has incurred enormous economic loss. Thus, accessible methods are urgently needed to alleviate or eliminate damage by rotational fretting. Surface engineering is an effective approach that is successfully adopted to enhance the ability of components to resist the fretting damage. In this paper, using a high-velocity oxygen fuel sprayed（HVOF） technique WC-17 Co coating is deposited on an LZ50 steel surface to study its properties through Vickers hardness testing, scanning electric microscope（SEM）, energy dispersive X-ray spectroscopy（EDX）, and X-ray diffractrometry（XRD）. Rotational fretting wear tests are conducted under normal load varied from 10 N to 50 N, and angular displacement amplitudes vary from 0.125° to 1°. Wear scars are examined using SEM, EDX, optical microscopy（OM）, and surface topography. The experimental results reveal that the WC-17 Co coating adjusted the boundary between the partial slip regime（PSR） and the slip regime（SR） to the direction of smaller amplitude displacement. As a result, the coefficients of friction are consistently lower than the substrate＇s coefficients of friction both in the PSR and SR. The damage to the coating in the PSR is very slight. In the SR, the coating exhibits higher debris removal efficiency and load-carrying capacity. The bulge is not found for the coating due to the coating＇s higher hardness to restrain plastic flow. This research could provide experimental bases for promoting industrial application of WC-17 Co coating in prevention of rotational fretting wear.展开更多
基金Supported by Yangtze River Scholars and Innovation Team Development Plan of China(Grant No.IRT1178)Guizhou Provincial Joint Foundation of China(Grant No.LKG[2013]09)Guizhou Provincial Universities Engineering Research Center Project of China(Grant No.[2012]023)
文摘Rotational fretting which exist in many engineering applications has incurred enormous economic loss. Thus, accessible methods are urgently needed to alleviate or eliminate damage by rotational fretting. Surface engineering is an effective approach that is successfully adopted to enhance the ability of components to resist the fretting damage. In this paper, using a high-velocity oxygen fuel sprayed（HVOF） technique WC-17 Co coating is deposited on an LZ50 steel surface to study its properties through Vickers hardness testing, scanning electric microscope（SEM）, energy dispersive X-ray spectroscopy（EDX）, and X-ray diffractrometry（XRD）. Rotational fretting wear tests are conducted under normal load varied from 10 N to 50 N, and angular displacement amplitudes vary from 0.125° to 1°. Wear scars are examined using SEM, EDX, optical microscopy（OM）, and surface topography. The experimental results reveal that the WC-17 Co coating adjusted the boundary between the partial slip regime（PSR） and the slip regime（SR） to the direction of smaller amplitude displacement. As a result, the coefficients of friction are consistently lower than the substrate＇s coefficients of friction both in the PSR and SR. The damage to the coating in the PSR is very slight. In the SR, the coating exhibits higher debris removal efficiency and load-carrying capacity. The bulge is not found for the coating due to the coating＇s higher hardness to restrain plastic flow. This research could provide experimental bases for promoting industrial application of WC-17 Co coating in prevention of rotational fretting wear.
