Influence of surface nano/ultrafine structure achieved by deep rolling process on plasma nitriding and tribological properties of the AISI 316l stainless steel

Influence of formation of surface nano/ultrafine structure using deep rolling on plasma nitriding and tribological properties of the aisi 316l stainless steel was investigated. initially,the deep rolling process was carried out on the bar-shapedspecimensat 15 cycles with 0.2 mm/s longitudinal rate and 22.4 rpm bar rotation.then,plasma nitriding treatment was applied on the as-received and deep rolled kind sat 450 °c and h2-25%vol. n2 gas mixture for 5h. surface micro-hardness and un-lubricated pin-on-ring sliding wear tests were carried out on the as-received,deep rolled,plasma nitrided and deep rolled-plasma nitrided kinds. results revealed that deep rolled-plasma nitrided kind is shown the highest wear resistance than the others,due to the further increased surface hardness achieved via the combined process. © 2017,iran university of science and technology. all rights reserved.