Effect of local treatment temperature of ultrasonic nanocrystalline surface modification on tribological behavior and corrosion resistance of stainless steel 316L produced by selective laser melting

In this study, the effects of local treatment temperature of ultrasonic nanocrystal surface modification (UNSM) on tribological behavior and corrosion resistance of stainless steel 316L produced by selective laser melting (SLM) were investigated. The as-printed samples were treated by UNSM at room and high temperatures (RT and HTs) and their strength, tribological behavior and corrosion resistance were compared and discussed. Dry friction coefficient of the UNSM-treated at RT and HT samples was reduced from 0.73 to 0.56 and 0.67 to 0.52, while the dry sliding wear resistance at RT and HT was enhanced from 7.25 x 10(-8) to 5.8 x 10(-8) and 7.01 x 10(-8) to 5.2 x 10(-8) mm(3)/Nmm, respectively. Increase in local treatment temperature of UNSM resulted a lower friction coefficient and higher wear rate compared to that of the UNSM at RT.