EFFECT OF STAND-OFF DISTANCE ON ABRASIVE WATER JET PIERCING OF CERAMIC-COATED SUPERALLOY

V. Balaji, N. Yuvaraj, N. Lenin and A. Manjunath
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V. Balaji: Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala, R&D Institute of Science and Technology, Avadi, Chennai 600062, Tamil Nadu, India
N. Yuvaraj: ��Advanced Ceramics and Composites Division CSIR-Central Glass & Ceramic Research Institute, Kolkata 700032, West Bengal, India
N. Lenin: Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala, R&D Institute of Science and Technology, Avadi, Chennai 600062, Tamil Nadu, India
A. Manjunath: ��Gas Turbine Research Establishment (GTRE), Defence Research & Development Organisation, Bengaluru 560093, Karnataka, India

Surface Review and Letters (SRL), 2023, vol. 30, issue 02, 1-10

Abstract: The drilling of film cooling holes on gas turbine blades made out of ceramic-coated superalloy improves the efficiency of the gas turbine and prolongs the life of the turbine blade. The purpose of this study was to investigate the effects of different stand-off distances (SODs) on abrasive water jet (AWJ)-pierced holes, in which the machining time, entry and exit hole diameters, overcut, hole taper, and surface morphology were studied. In this study, the water jet pressure (WJP) of 275MPa, piercing angle of 90∘, dwell time of 0.2s, and abrasive flow rates (AFRs) of 350g/min and 400g/min were considered for the AWJ piercing operations. The entry and exit hole diameters and overcut linearly increased with an increase of SOD with different abrasive flow rates. And hole taper was observed at the coating and substrate sections in which it decreased with an increase of SOD up to 2mm, and a further increase of SOD increased the hole taper. Besides, the drilled holes were found to have an absence of delamination, cracks, and thermal defects. It was also noted that there is a transformation from a brittle to a ductile mode of erosion that may occur in the high-erosion kinetic energy impact region in the YSZ material section. Based on the experimental results, it is confirmed that SOD of 2mm became an influencing factor in AWJ for piercing quality holes in the YSZ-coated superalloy.

Keywords: Abrasive water jet; piercing; ceramic; coating; superalloy; hole geometry (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1142/S0218625X23500038

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