Surface Properties of Additively Manufactured 316L Steel Subjected to Ultrasonic Rolling

The ultrasonic rolling (UR) was applied to strengthen the surface properties of the laser additive manufactured 316L stainless steel (LAMed-316SS). The wear resistance and corrosion resistance of LAMed-316SS were researched to reveal the surface strengthening mechanism of UR. The results indicated that the surface integrity of LAMed-316SS was reconstructed by UR due to the severe plastic deformation with the grain refined, the surface roughness reached 0.051 μm, the surface microhardness increased to 319 HV_0.05, and the compressive residual stress induced up to − 176 MPa. After UR, the wear mechanism of LAMed-316SS was changed into the delamination wear from the abrasive wear and adhesive wear. In virtue of the reconstructed surface integrity, the wear resistance and corrosion resistance of LAMed-316SS were enhanced with the wear rate, friction coefficient, and corrosion current density decreased by 14.8%, 18.6%, and 40.5%, and the polarization resistance increased by 33.9%, individually.