摘要
针对飞秒激光加工镍基合金材料,研究了4种数值孔径的聚焦透镜和3种加工环境(空气、真空和氩气)对飞秒激光加工效率和重铸层的影响。实验结果表明:聚焦透镜数值孔径越大,聚焦后激光能量密度越大,加工效率越高,而焦深越小,可加工材料厚度越小。在空气、真空和氩气3种加工环境下,镍基合金飞秒激光加工的重铸层厚度随着脉冲个数的变化规律相似,在相同脉冲个数下,3种加工环境中加工深度差距不大。
The effect of lens and gas on femtosecond laser machining in a nickel-based surperalloy was investigated. The experimental results indicated that laser lfuence increased with increasing the numerical aperture of the lens, and the lager ablation rate was associated with higher laser lfuence. However, the decrease of focus depth of the lens resulted in decreasing the maximal depth of laser ablation. In vacuum or in the presence of the gas of air and argon, the dependence of recast layer thickness on pulse number was similar, and there was no distinct difference of ablation depth in the same pulse number.
出处
《航空科学技术》
2015年第11期109-113,共5页
Aeronautical Science & Technology
