Journal
SURFACE & COATINGS TECHNOLOGY
Volume 397, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2020.125994
Keywords
Electropulsing-assisted ultrasonic nanocrystal surface modification; Pulsed current; Electroplasticity; Hardness; Wear resistance
Funding
- National Natural Science Foundation of China [51771155]
- China Scholarship Council
- National Science Foundation CAREER program [CMMI 1847247]
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In this study, electropulsing-assisted ultrasonic nanocrystal surface modification (EP-UNSM) was used to process 300M steel. It has been demonstrated that pulsed current can more effectively improve the plasticity of 300M steel as compared to continuous current having the same effective current density, even though the bulk temperature (around 150 degrees C) and thus the thermal effect is the same. It is believed that a pulsed current, which has a much higher peak current density, can more effectively activate pinned dislocations and can better assist the deformation-based surface modification process. EP-UNSM treatment of the steel resulted in much higher surface hardness and greater plastically affected depth as compared to both UNSM and continuous current-assisted UNSM (CC-UNSM). As a result, EP-UNSM treatment imparted much higher wear resistance to the steel than either UNSM or CC-UNSM treatment. It has been demonstrated that pulsed current can effectively improve the process effectiveness of the selected deformation-based surface engineering process (UNSM) without significantly increasing the temperature.
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