挤压TC4钛合金U型材矫直工艺研究

Analysis of straightening process for extruded TC4 titanium alloy U profile

研究了矫直加热温度和降温速率对U型材矫直变形、组织和性能的影响。结果表明:在相同降温速率条件下,随矫直温度升高,U型材矫直变形效果好;在相同加热温度时,随着降温速率减小,高温矫直变形后的回弹性越小,U型材矫直变形效果好;矫直加热温度720℃和降温速率30℃/min时,矫直后U型材满足AMS2245《钛及钛合金挤压条、棒材及型材尺寸公差》的相关要求;矫直加热温度不高于720℃,矫直工艺并不改变其组织和性能。

In this paper,the effects of heating temperature and cooling rate on the straightening deformation,microstructure and properties of U profile has been studied.The results show that:Under the same cooling rate,the straightening effect of U profile is better with the increase of straightening temperature.At the same heating temperature,as the cooling rate decreases,the resilience of the high temperature straightening deformation is smaller.The straightening effect of U profile is better.When the heating temperature is 720℃and the cooling rate is 30℃/min,the U profile after straightening can meet the requirements of AMS2245《tolerance of titanium and titanium alloy extrusion strip,bar and profile》.When the heating temperature of straightening is not higher than 720 C,the straightening process does not change its microstructure and properties.