(北京航空材料研究院，北京100095)
摘 要: 研究了TA15钛合金变形量大的d20 mm小棒材及变形量小的大锻件的热处理行为。结果表明：在750~920 ℃范围内，随着退火温度的升高，大锻件拉伸强度升高约100 MPa，小棒材拉伸强度先降后升，且升幅远小于大锻件的；920 ℃以上退火，二者强度都出现降低。随着退火温度的升高，小棒材中再结晶软化率先发挥作用，使拉伸强度降低；而830 ℃以上退火，β转变组织中次生α二次析出起到强化作用，二者抗拉强度均出现升高，但小棒材由于再结晶温度低，再结晶软化削弱了析出强化的作用。
关键字: TA15钛合金；热处理；变形程度；再结晶；析出强化
different deformation degrees
（Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:The heat treatment behavior of TA15 titanium alloys with different deformation degrees was studied with d20 mm bar and large forging as the representatives for large deformation and small deformation, respectively. The results show that tensile strength increment can be obtained to be 100 MPa for large forging. The tensile strength decreases and then increases for the bar, and the increment is far less than that of large forging when annealed at 750−920 ℃. Both tensile strengths decrease when annealed at temperature higher than 920 ℃. The decrease of the tensile strength for the bar is caused by the recrystallization softening effect with increasing the annealing temperature. The strengthening effect for the little bar and large forging is caused by the secondary phase precipitation from the transformed β above 830 ℃. The precipitation strengthening effect on the little bar is smaller than that of the large forging because of the recrystallization softening effect.
Key words: TA15 titanium alloy; heat treatment; deformation degree; recrystallization; precipitation hardening
