TA15　titanium　alloy　has　been　widely　used　in　the　aerospace　industry　due　to　its　moderate　high-temperature　performance.　In　this　research,　TA15　samples　with　excellent　mechanical　properties　were　successfully　fabricated　by　laser　powder　bed　fusion　(LPBF).　Results　show　that　the　microstructure　of　TA15　sample　is　composed　of　acicular　alpha　＇　martensites　within　the　columnar　prior　beta　grain.　During　manufacturing　process　of　LPBF,　the　non-equilibrium　heating　and　cooling　of　the　thermal　cycles　experiencing　different　peak　temperatures　result　in　the　hierarchical　structure　of　martensite.　After　heat　treatment　at　750　degrees　C,　840　degrees　C,　900　degrees　C,　and　940　degrees　C　for　two　hours,　the　fine　martensitic　structure　has　transformed　into　a　mixture　of　alpha　and　beta.　With　the　increase　of　temperature,　the　volume　fraction　of　beta　increases　from　10.3%　to　49.9%,　the　width　of　primary　alpha　increases　from　0.72　+/-　0.16　&　micro;m　to　2.96　+/-　0.17　&　micro;m　because　of　the　simultaneous　fragmentation　of　the　primary　alpha.　So　the　ultimate　and　yield　strengths　decrease　while　the　elongation　increases.　After　heat　treatment　at　940　degrees　C,　the　specimen　shows　the　best　comprehensive　mechanical　properties,　the　elongation　increases　to　11.5%,　the　tensile　strength　is　1061　MPa,　and　the　yield　strength　is　961　MPa.　The　fracture　surface　shows　the　typically　ductile　fracture　character.　(c)　2021　Elsevier　B.V.　All　rights　reserved.