TA15钛合金大锻件热处理强化及机制

研究了TA15钛合金大型锻件退火温度和保温时间对室温和500℃高温拉伸性能的影响,结果表明:随着退火温度的升高,拉伸强度增大,在800～890℃温度范围内,室温强度升幅达90MPa,500℃高温强度升幅达66MPa;随保温时间延长,室温和500℃高温拉伸强度呈峰值变化,保温3h时最高。研究表明,退火温度提高,基体β转变组织分解析出第二相起到强化作用,提高了大锻件的强度。

Heat Treatment Strengthening and Its Mechanism of Large Forging for TA15 Titanium Alloy

The effect of annealing temperature and holding time on the tensile properties of large forging TA15 titanium alloy at room and high temperatures 500℃were studied.The results showed that with the annealing temperature increasing from 800℃to 890℃.the tensile strength increased 90 and 66 MPa at room temperature and 500℃respectively;and with the holding time extending.the tensile strength at room-temperature and 500℃increased in the beginning and then decreased,a peak value occurred when the holding time was 3 h.The mechanism Was outlined that the strengthening effect of alloy was caused by the secondary phase which precipitated from the transformed β with the increase of annealing temperature.