AN IN-DEPTH INVESTIGATION ON KERF ANGLE IN PIERCED HOLE ON INCONEL-625 SUPERALLOY USING ABRASIVE WATERJET CUTTING PROCESS

M. Santhanakumar, R. Vijayakumar, R. Adalarasan and M. Rajesh
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M. Santhanakumar: Department of Industrial Engineering, College of Engineering Guindy, Anna University, Chennai, Tamil Nadu, India
R. Vijayakumar: ��Department of Mechanical Engineering, GRT Institute of Engineering and Technology, Tiruttani, Tamil Nadu, India
R. Adalarasan: ��Department of Mechanical Engineering, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Chennai 602105, Tamilnadu, India
M. Rajesh: �Department of Mechanical Engineering, Hindustan Institute of Technology and Science, Chennai, Tamil Nadu, India

Surface Review and Letters (SRL), 2024, vol. 31, issue 12, 1-23

Abstract: This work investigates the piercing of microholes in turbine shroud rings (Inconel-625) using the Abrasive Waterjet Cutting process. The concern with the hole piercing is the kerf angle caused by the attenuation of the jet energy and stand-off distance, which seriously impacts the processing precision of abrasive water jet piercing. The effects of piercing parameters like machining time (40, 60 and 80s), abrasive mesh size (80 mesh and 120 mesh), stand-off distance (1, 2, 3 and 4mm), abrasive jet pressure (100, 125, 150 and 175MPa) are studied to reduce the kerf angle. The kerf angle increased linearly with a stand-off distance increase at different machining times. By piercing for 60s and 80s, the lowest values of kerf angle are obtained (0.03∘ and 0.02∘). The optimum conditions for making a pierced hole with a minimum kerf angle of 0.02∘ were achieved with a machining time- of 60s, abrasive mesh size- of 20 mesh, and abrasive jet pressure- of Scanning electron microscope (SEM) images and visual measuring system (VMS) images are used to identify the surface characteristics in kerf zone. The features, including ploughing, particle embedment, lip impression and wear path due to the ductile mode of erosion caused by high energy impact, is also discussed.

Keywords: Kerf angle; piercing; abrasive waterjet; Inconel-625; erosion; stand-off distance (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1142/S0218625X24500999

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