Akademik Veri Yönetim Sistemi
Materials Science and Engineering: A, cilt.964, 2026 (SCI-Expanded, Scopus)
Laser powder bed fusion (L-PBF) enables the production of metallic components with complex geometries. However, L-PBF leads to the formation of defects such as porosity, lack of fusion and residual stresses, which directly affect the mechanical properties. In particular, the scanning rate and strategy control the mechanical performance of the produced components by determining the melt pool characteristics, defect formation, and microstructural evolution. This study reveals the effects of variations in scanning rate (800-1200 mm/s) and scanning strategy (stripe and chessboard) on the microstructural, mechanical and fracture properties of AISI 316L stainless steel during L-PBF. AISI 316L SS at low scanning rates exhibit reduced porosity, refined microstructures, and improved ductile fracture properties, while increasing the scanning rate promotes incomplete fusion, porosity and cleavage dominant brittle fracture. Tensile tests show that the ultimate tensile strength decreases by increasing scanning speed, being higher in chessboard samples at low speeds (736 MPa) compared with stripe samples at higher speeds (443 MPa). Similarly, three-point bending strength decreases along the same parameter (360 MPa–256 MPa). Tensile ductility is higher at low scan speeds (83%), but decreases significantly at the highest scan speeds (11%). In the three-point bending results, the cast sample exhibited the highest maximum load (11560 N) compared to the lowest value (6550 N) obtained for the highest-speed L-PBF sample. SEM images showed that dimpled ductile fracture occurred at low scan speeds and exhibited brittle fracture with increasing scanning speeds. The chessboard strategy limited the presence of micro defects by improving the microstructure.