Formation of Sub-100 nm Femtosecond Laser-Induced Periodic Fine Structures on Laser Powder Bed Fusion Fabricated Stainless Steel

This study investigated laser-induced periodic surface structures (LIPSS) produced on laser powder bed fusion (LPBF) fabricated SUS316L (LPBF-SUS) and typical cold-rolled SUS 304 (CR-SUS) by femtosecond fiber laser with a wavelength of 515 nm. The HSFL (high spatial frequency LIPSS) appeared related to CR-SUS grain boundary characteristics and was partially formed. In addition, the uniform HSFL on the LPBF-SUS with a period of about 60~70 nm (~/8) was demonstrated.