In　this　study,　15-5　PH　stainless　steel　were　fabricated　by　laser　powder　bed　fusion　(LPBF)　at　different　construction　angles　(0°,　30°,　45°,　60°,　and　90°).　Effects　of　construction　angles　on　the　microstructure,　mechanical　properties,　electrochemical　properties　and　surface　characterization　of　15-5　PH　stainless　steel　were　investigated.　The　LPBF-fabricated　15-5　PH　stainless　steel　exhibited　a　“track-track”　overlap　trajectory　on　the　horizontal　plane,　and　the　vertical　plane　displayed　the　“layer-layer”　overlap　of　the　melt　pool.　All　samples　were　composed　of　martensitic　and　austenite　phases.　Irregular　grains　and　random　grain　orientation　were　found　in　each　sample.　In　fact,　the　construction　angle　has　an　important　role　in　the　microstructure.　The　0°　sample　has　the　lowest　martensite　content　(75.8%),　since　fewer　deposited　layers　correspond　to　less　number　of　thermal　cycles.　Due　to　the　largest　amount　of　martensite　(90.1%),　the　45°　sample　exhibits　the　highest　hardness　of　308.9HV0.2.　The　similar　tensile　strength　and　yield　strength　are　achieved　for　samples　fabricated　at　different　forming　angles.　Layer　by　layer　melt　pool　boundary　(MPBs)　contributes　to　the　ductile　deformation,　whereas　track　by　track　MPBs　is　favorable　for　brittle　deformation.　Samples　with　a　larger　construction　angle　have　more　layer　by　layer　MPBs,　resulting　in　the　increased　elongation.　Therefore,　the　0°　sample　shows　a　minimum　elongation　of　20.1%,　but　the　90°　sample　reaches　a　maximum　elongation　of　23.9%.　The　construction　angle　affects　the　corrosion　resistance　of　the　15-5　PH　SS　by　influencing　the　martensite　content.　As　a　result,　the　0°　sample,　with　the　highest　austenite　content　(24.2%),　shows　the　best　corrosion　resistance　and　lowest　roughness.　©　2024　Elsevier　B.V.