Effect of Femtosecond Laser Fluence on Recast Layer and Machining Time in Nickel-Based Superalloy
ZHANG Wei, ZHANG Xiaobing, CAI Min, JI Liang
(1. AVIC Manufacturing Technology Institute, Beijing 100024, China;
2. National Key Laboratory of Science and Technology on Power Beam Processes, Beijing 100024, China)
Abstract：The effect of femtosecond laser fluence (0<Ф<44.2J/cm2) on recast layer and machining eff iciency were
investigated with the no-melting ablation threshold (Φth1) and melting ablation threshold (Φth2) in a single-crystal nickelbased
superalloy. For the laser fluence range (Φth1<Φ<Φth2), there are no indications of conventional laser-induced recast
layers in laser-machined area of nickel-base superalloy. For the laser fluence Φ>Φth2, recast layers appeared gradually and
increased with increasing laser fluence. The relationship between ablation depth for single pulse and laser fluence is established.
The larger ablation rate is associated with higher laser fluence.
2017, 
