热加工工艺对叶片用TC4钛合金棒材组织与性能的影响

Effect of Hot Working Processes on Microstructure and Properties of TC4 Titanium Alloy Bar for Blade

为优化发动机叶片用TC4钛合金棒材热加工工艺,对比研究了相同条件下精锻和轧制工艺对棒材组织与性能的影响,以及精锻温度和精锻变形量对棒材组织与性能的影响。结果表明:与精锻相比,轧制变形时间短、温升明显,导致轧制棒材初生α相含量低,室温强度和高温强度明显低于精锻棒材,但组织更加均匀,超声探伤杂波水平低。此外,随着精锻温度的升高,棒材初生α相含量减少,室温强度和高温强度下降,但超声探伤杂波水平降低;随着精锻变形量的增大,棒材变形不均匀性加剧,室温强度和高温强度逐渐提高,但超声探伤杂波水平增大。精锻温度为940℃时,TC4钛合金棒材的组织与性能匹配较好。

To optimize the hot working processes of TC4 titanium alloy bar for blade,the effect of precision forging and rolling processes on microstructure and properties under the same conditions were compared,and the influences of precision forging temperatures and deformation degrees on microstructure and properties were further analyzed.The results show that compared with the precision forging process,the rolling deformation time is shorter and the rise of temperature is obvious,resulting in a low volume fraction of primaryαphase,and the strength at room and high temperature is significantly lower than that of the precision forging bar,but the microstructure is more uniform,the ultrasonic testing noise level is lower.In addition,with the increase of precision forging temperature,the volume fraction of primaryαphase decreases,and the tensile strength at room and high temperature also decrease,but the ultrasonic testing noise level decreases.With the increase of precision forging deformation,the non-uniform deformation of forging bar is sharpened,and the tensile strength at room and high temperature are improved gradually,but the ultrasonic testing noise level increases.When the precision forging temperature is 940℃,the microstructure and properties of precision forging bar matches well.