Abstract
Titanium (Ti) and its alloys have received significant attention recently, particularly for medical science, automobile, and aerospace applications. Drilling is used for around 40% to 60% of the material removal processes of an aeronautical product. Non-conventional machining can obtain an optimal quality of drilled holes. The present study has employed a pulsed Nd:YAG laser having 250 W average power to perform the microdrilling on a titanium alloy of 0.45-mm-thick sheet. The study focuses on determining the impact of laser parameters (gas pressure (4 ~ 8 bar), laser input current (200 ~ 260 A), pulse width (4 ~ 8 ms), and pulse repetition rate (1 ~ 7 Hz)) on performance characteristics during microdrilling on a thin foil of titanium alloy having 0.45 mm thickness. To evaluate the quality of microdrilled holes, aspects, e.g., circularity, spatter area, and taper, have been considered. The response surface methodology (RSM) based on the design of the experiment technique was employed to estimate the influence of parameters on performance characteristics with the least number of experiments. The study indicates that assistant gas pressure, pulse width, and laser input current are the essential parameters in taper formation and spatter deposition. The study suggests that the increase in pulse repetition rate and pulse width improves the circularity of the hole. The electron micrography of the drilled holes helps to determine the development of the heat-affected zone (HAZ) and microcracks near drilled holes. The presented research provides a new understanding of how the process parameters contribute to the HAZ development, crack occurrence and intensity.
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Funding
The work is financially supported by the National Natural Science Foundation of China (Grant No. 52175425) and the Shanghai Industrial Collaborative Innovation Project (Grant No. HCXBCY-2022–040). This publication has emanated from research supported by a research grant from Science Foundation Ireland (SFI) under grant number 16/RC/3872 and is co-funded by the European Regional Development Fund and I-Form industry partners.
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Suman Chatterjee, Siba Sankar Mahapatra, Jinyang Xu, and Dermot Brabazon contributed to the conception of the study. Suman Chatterjee performed the experiment and wrote the manuscript. Siba Sankar Mahapatra, Jinyang Xu, and Dermot Brabazon helped perform the analysis with constructive comments and reviewed the manuscript.
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Chatterjee, S., Mahapatra, S.S., Xu, J. et al. Influence of parameters on performance characteristics and defects during laser microdrilling of titanium alloys using RSM. Int J Adv Manuf Technol 129, 4569–4587 (2023). https://doi.org/10.1007/s00170-023-12525-4
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DOI: https://doi.org/10.1007/s00170-023-12525-4