The　microstructures　and　mechanical　properties　of　β-forged　and　as-heat　treated　high　temperature　titanium　alloys　were　carefully　investigated.　Heat　treatments　with　solution　processes　varying　from　940℃～1010℃　and　aging　at　650℃　after　water　quenching　were　adopted.　After　forging,　prior　β　grains　were　squashed　and　elongated.　The　content　of　the　primary　α　phase　decreased　with　increasing　solution　temperatures,　while　the　content　of　the　transformed　β　structures　increased.　After　water　quenching　plus　aging　processes,　super-fine　secondary　α　lamellas　with　widths　of　80～400　nm　precipitated　in　transformed　β　structure.　Secondary　nano-scale　silicides　with　a　size　of　～82　nm　re-precipitated.　More　α2　phase　particles　with　a　mean　size　of　8.00　nm　were　dispersively　and　uniformly　precipitated.　After　heat　treatment　at　1000℃,　the　room　temperature　ultimate　strength　and　yielding　strength　were　enhanced　by　241　MPa　and　228　MPa,　reaching　1256　MPa　and　1151　MPa,　respectively.　The　high　temperature　ultimate　strength　and　yielding　strength　were　enhanced　by　119　MPa　and　128　MPa,　reaching　756　MPa　and　669　MPa,　respectively.　The　high　temperature　elongation　increased　to　13.6%.　The　excellent　mechanical　properties　compared　to　the　previously　studied　were　ascribed　to　the　precipitation　of　super-fine　secondary　α　lamellas　in　βt,　dispersed　nano-scale　silicides　and　α2　particles,　and　the　superior　mixing　proportion　of　Pα　and　βt　acquired　after　optimization　of　heat　treatments.　©　2024　Elsevier　Ltd