Laser　powder　bed　fusion　(LPBF)　has　significant　advantages　in　the　fabrication　of　complex-structured　duplex　stainless　steel　(DSS).　However,　compared　with　cast　samples,　the　duplex　stainless　steel　prepared　by　LPBF　has　higher　strength,　but　the　elongation　and　corrosion　resistance　are　significantly　deteriorated,　which　restricts　its　extensive　promotion　and　application.　To　achieve　a　balance　between　mechanical　properties　and　corrosion　resistance,　the　heat　treatment　was　carried　out　at　different　temperatures　of　950°C,　1050°C,　1150°C,　and　1250°C.　The　influence　of　microstructure　including　phase　ratio,　grain　size,　and　grain　boundary　features　with　different　temperature　heat　treatment　on　the　mechanical　properties　and　corrosion　resistance　was　investigated.　The　results　show　that　the　as-built　samples　had　almost　all　ferrite　due　to　the　extremely　fast　cooling　rate　even　if　the　2205　DSS　powders　were　used.　Ferrite-austenite　structure　could　be　obtained　with　different　heat　treatment　temperature,　which　increase　LAGB　and　coincidence　site　lattice　(CSL)　boundaries　and　reduce　residual　stress.　When　the　2205　DSS　prepared　by　LPBF　was　heat-treated　at　1050　℃　for　1　h,　the　two-phase　ratio　was　close　to　1:1　and　a　highest　content　of　LAGB+　∑3(n)　CSL　of　25.50　%　could　be　obtained.　The　H-1050　sample　demonstrated　an　equilibrium　between　mechanical　properties　and　corrosion　resistance,　exhibiting　a　tensile　strength　of　778.79　MPa,　a　yield　strength　of　592.43　MPa,　a　corrosion　current　density　of　1.21　μA/cm²,　the　highest　self-corrosion　potential　of　−0.718　V,　and　the　largest　charge　transfer　resistance　of　12.4　×　10⁴　Ω·cm².　Some　corrosion　pits　caused　by　ferrite　corrosion　can　be　seen　and　the　lowest　corrosion　depth　of　H-1050　was　about　7.4　μm.　It＇s　concluded　that　heat　treatment　can　change　the　microstructure　of　DSS　and　improve　its　comprehensive　performance.　The　best　heat　treatment　temperature　was　found　to　be　1050°C.　The　research　conducted　will　provide　theoretical　guidance　for　the　selection　of　heat　treatment　temperature　for　DSS　prepared　by　LPBF.　©　2025　Elsevier　Ltd