论文部分内容阅读
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。
The heat treatment of TA20 titanium alloy with large deformation of d20 mm and large deformation of small forging was studied. The results show that the tensile strength of large forging increases about 100 MPa with the increase of annealing temperature at 750-920 ℃, and the tensile strength of the small bar first decreases and then increases, ℃ above annealing, the intensity of both decreased. With the increase of annealing temperature, the recrystallization softening rate in the small bar first takes effect and the tensile strength decreases; while annealing above 830 ℃, secondary α secondary precipitation in β transformation structure plays a strengthening role, However, the small bars have the effect of precipitation hardening due to low recrystallization temperature and recrystallization softening.