采用大功率CO2快轴流激光器进行了Ti-7Al-2Zr-2Mo-2V的激光弯曲成形,研究了累积线能量密度对钛合金显微组织和维氏硬度的影响.提出了累积能量密度门槛值的概念,累积线能量密度高于门槛值时,累积线能量密度对钛合金显微组织和显微硬度有影响,低于门槛值时没有影响.随着累积线能量密度的增加,HAZ尺寸呈二次曲线增加.

This paper investigates laser forming of Ti-7Al-2Zr-2Mo-2V with a 2000 W fast-axial flow CO2 laser unit. The study has been on the influence of accumulated energy density (AED) on the microstructure and Hvs hardness of laser bent Ti-7Al-2Zr-2Mo-2V. The paper presents a concept of critical value on AED. Microscopy observations have revealed that there are no effect on the microstructure of Ti-7Al-2Zr-2Mo-2V with the AED values less than 40 J/mm2, but the effects occur with the AED values higher than the critical value. With the increasing of AED the HAZ size grows in quadratic function.