Femtosecond Laser Drilling Performance of GH4169 Nickel-based Superalloy
CHEN Taili1,2, NIU Fan1, XU Lianghui2, CHEN Xinyue2, HOU Xiaowei2, SUN Jiang2, SI Yan2, FANG Xiuyang1,*, CAI Zhenbing1
1 Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China 2 Cheng Du Hang Li (Group) Industrial Co., Ltd., Chengdu 611937, China
Abstract: In order to improve the drilling quality of femtosecond laser processing nickel-based superalloy materials and optimize the drilling laser processing parameters, drilling experiments were carried out. Using femtosecond laser processing test platform, under different processing parameters (single-layer feed rate, laser power) setting different parameter levels, the hole machining of nickel-based superalloy plate with thickness of 1 mm was carried out, at the same time, the cross-section morphology of the hole processed by EDM and femtosecond laser was compared. The results show that the number of penetrating layers decreases with the increase of laser processing power and single layer feed rate. The size of the entrance aperture and the exit aperture increases with the increase of the laser power, and decreases with the increase of the single-layer feed rate. The hole taper decreases first and then increases with the increase of the laser power and the single-layer feed rate, when the single-layer feed rate is 15 μm, the overall taper of the hole is small, and the minimum taper is 2.3 °. The roughness of the exit region is generally larger than that of the entrance, and the periodic columnar structure is formed in the exit region. Serious internal defects such as recast layer and irregular microcracks are produced in the inner wall of small holes machined by EDM. However, there are no defects such as remelting layer, intergranular corrosion, heat affected zone and cracks in the inner wall of femtosecond laser processing, forming the inner wall morphology of nano-stripe structure, and the processing quality is good. Under the condition of fixed spot shape and wavelength, the optimal drilling quality of nickel-based superalloy plate with 1 mm thickness can be obtained when the laser power is 14 W and the single-layer feed rate is 15 μm.
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2025, Vol. 39 
