激光驱动飞片微塑性温成形实验研究

Experimental Investigation on Warm Micro-Forming by Laser-Driven Flyer

提出了一种激光驱动飞片微塑性温成形方法,采用波长1064nm的Yd:YAG激光器进行了温成形实验,对T2紫铜成形件三维形貌进行观测,分析了温度(25℃,100℃,150℃,200℃)与激光能量(1020,1380,1690,1900mJ)对成形深度的影响;使用纳米压痕仪研究了成形件成形区域硬度变化规律,并对成形机理进行了初步分析。结果表明,激光驱动飞片微塑性温成形方法可以获得较好的综合性能:不仅可以提高紫铜温成形能力,而且可以适当增强冲击区域硬度。分析认为,激光驱动飞片微塑性温成形是激光驱动飞片冲击强化机制与温度软化机制相互竞争的结果。

In this paper,the laser-driven flyer warm micro-forming method is proposed.Warm forming experiments are carried out using Yd：YAG laser with wavelength of 1064 nm and 3D morphology of formed T2 copper parts are observed.The influence of temperature（25 ℃,100 ℃,150 ℃,200 ℃）and laser energy（1020,1380,1690,1900 mJ）on the forming depth are analyzed.Hardness variation of the formed parts in forming regions is studied using nanoindentation and the forming mechanism is preliminary analyzed.It is found that better comprehensive performance during the plastic deformation is obtained by the laser-driven flyer warm micro-forming method：not only warm formability can be improved but also the hardness can be improved properly in forming regions.It is concluded that the laser-driven flyer warm micro-forming results from the competitive effects of both the laser shock peening mechanism and temperature soften mechanism.