Analysis of Hole Taper, Recast Layer and Heat Affected zone in pulsed O<sub>2</sub>and N<sub>2</sub>laser drilling of Difficult-to-cut alloy Nimonic C-263

Ezhilarasan, Chakaravarthy; Velayudham, A.; Nagaraj, M.; Anburaj, R.

doi:10.1088/1757-899x/390/1/012036

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…Ghoreishi et al developed a statistical model for analyzing and comparing hole entrance and taper circularity of steel alloys [21]. Not many researchers have addressed the defocusing impact on drilling hole quality in depth [22][23][24][25][26][27]. Saad and Chao have also investigated the taper angle during millisecond laser drilling of 18CrNi8 steel under multiple parameters and defocused plane but investigation of recast layers at entrance and exits as well as molten pool splashes was not studied yet [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

Nawaz

Kashif

Abbas

et al. 2020

Mater. Res. Express

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Modern manufacturing industries prefer laser drilling processes owing to the adequate controlled drilling in comparison with existing alternatives. The presented experimental study mainly accounts defocusing impact along with other technical parameters and optimization of Nd:YAG millisecond pulsed laser drilling; and finally their influence on the entrance and exit holes profile. The key technical parameters such as pulse frequency, pulse width and assisting gas pressure with respect to different defocused focal plane are explored experimentally for the percussion laser drilling of high grade steel 18CrNi8. Experiment results revealed that increase in defocusing distance has caused an increment in hole entrance diameter; however, with different defocusing distance, the entrance diameter increasing rate keep changing. Different trends of increasing and decreasing diameter at entrance and exit are recorded and investigated with respect to work-piece defocusing positions. The defocusing variation of laser beam has been investigated with the hole profile, changing from straight hole to tapered blind hole. Which leads to conclusive and optimized results for obtaining optimal hole profile (at entrance and exit). The optimum parametric combinations for attaining lower heat treatment effects are also discussed for superior hole quality.

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Section: Introductionmentioning

confidence: 99%

Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

Nawaz

Kashif

Abbas

et al. 2020

Mater. Res. Express

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“…voltage, DF, frequency, FR, Even laser drilling is the widely used non-conventional machining process to manufacture effusion cooling holes at acute angles on aerospace components made of superalloys. Ezhilarasan et al [147] quantitatively analyzed the heat-affected zone, recast layer, and hole taper during the laser drilling of holes on Nimonic C263. The recast layer, heat-affected zone, and hole taper were found to be affected by pressure, power, and type of gas used for laser generation.…”

Section: Other Types Of Non-conventional Machiningmentioning

confidence: 99%

A review on conventional and nonconventional machining of Nickel-based Nimonic superalloy

Prasad

G.S

2023

Manufacturing Rev.

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Superalloys have gained prominence in recent years in various sectors, namely, spacecraft, marine, power, defense, vehicular and others, due to their ability to withstand high temperatures of up to 980 °C without deformation. Nimonics are Nickel-based superalloys usually known to be hard-to-machine materials due to their high strength at high temperatures, higher hardness, low thermal conductivity, and tendency to react with tool material. All these factors increase the level of difficulties in the machining of Nimonic superalloys. Numerous studies have examined various facets of machining of Nimonic alloys. This article summarizes the observation from 152 research articles to offer a reasonable engineering overview of the study of Nimonic alloys. An overview of Nimonic superalloys and their applications is given first. Then, various conventional and non-conventional machining processes, problems associated with multiple machining processes and methods to rectify the issues concerning the machining process have been reported. Thus, this summary will certainly help industrialists and academic researchers for further research work in machining Nimonic alloys.

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“…where R i, j is the range of mean value of GRC (Q i, j ) for the response i, process parameter j with level u. The value of weight v for each response is calculated using equation (18).…”

Section: Optimisationmentioning

confidence: 99%

“…The laser processing parameters which affect hole taper include laser pulse duration/ width, pulse energy, assist gas pressure, beam focal position and gas flow rate. [12][13][14][15][16][17][18][19][20] In previous research studies, several authors have explored the effects of these process parameters for single-pulse drilling. Yilbas and Yilbas 21 used the full factorial method to evaluate the impacts of focal position and material thickness on the quality of laser-drilled holes in Nimonic 75.…”

Section: Introductionmentioning

confidence: 99%

An integrated analysis of productivity, hole quality and cost estimation of single-pulse laser drilling process

Sarfraz

Shehab

Salonitis

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Laser drilling is a well-established manufacturing process utilised to produce holes in various aeroengine components. This research presents an experimental investigation on the effects of laser drilling process parameters on productivity (material removal rate), hole quality (hole taper) and drilling cost. Single-pulse drilling was employed to drill a thin-walled Inconel 718 superalloy plate of 1 mm thickness using pulsed Nd:YAG laser. The experiments were designed using Box-Behnken statistical approach to investigate the impacts of pulse energy, pulse duration, gas pressure and gas flow rate on the selected responses. Multi-objective optimisation was performed using response surface methodology (RSM) based grey rational analysis (GRA) to identify optimal drilling conditions aiming to maximise the MRR and minimise hole taper and drilling cost. The optimal combination of drilling parameters was found as pulse energy of 20 J, pulse duration of 6 ms, gas pressure of 100 psi and gas flow rate of 40 mm3/s. A detailed cost analysis identified labour cost, gas consumption and machine costs as the major cost elements of the laser drilling process.

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Analysis of Hole Taper, Recast Layer and Heat Affected zone in pulsed O₂and N₂laser drilling of Difficult-to-cut alloy Nimonic C-263

Cited by 4 publications

References 13 publications

Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

A review on conventional and nonconventional machining of Nickel-based Nimonic superalloy

An integrated analysis of productivity, hole quality and cost estimation of single-pulse laser drilling process

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Analysis of Hole Taper, Recast Layer and Heat Affected zone in pulsed O2and N2laser drilling of Difficult-to-cut alloy Nimonic C-263

Cited by 4 publications

References 13 publications

Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

Effect of defocused plane on entrance and exit hole geometry of high grade steel 18CrNi8 during percussion drilling by Nd:YAG millisecond laser system

A review on conventional and nonconventional machining of Nickel-based Nimonic superalloy

An integrated analysis of productivity, hole quality and cost estimation of single-pulse laser drilling process

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Analysis of Hole Taper, Recast Layer and Heat Affected zone in pulsed O₂and N₂laser drilling of Difficult-to-cut alloy Nimonic C-263