Investigation of EDM characteristics of nickel-based heat resistant alloy |
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Authors: | Email author" target="_blank">Sin?Ho?KangEmail author Dae?Eun?Kim |
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Affiliation: | (1) Department of Mechanical Engineering, Yonsei University, 134, Shinchon-dong, 120-749 Seodaemoon-ku Seoul, Korea;(2) Korea Plant Service and Engineering Co. Ltd. 247, Graduate School of Yonsei University, Gyeongseo-dong, Seo-gu, Incheon, Korea |
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Abstract: | The EDM processing characteristics of one of the nickel-based heat resistant alloys, Hast-elloy-X, were investigated under
the various EDM conditions and analyzed in terms of surface integrity. This alloy is commonly used as a material for the hot
gas path component of gas turbines and it is difficult to machine by conventional machining methods. The primary EDM parameter
which was varied in this study were the pulse-on time. Since the pulse-on time is one of the main factors that determines
the intensity of the electrical discharge energy, it was expected that the machining ratio and the surface integrity of the
specimens would be proportionally dependent on the pulse-on duration. However, experimental results showed that MRR (material
removal rate) and EWR (electrode wear rate) behaved nonlinearly with respect to the pulse duration, whereas the morphological
and metallurgical features showed rather a constant trend of change by the pulse duration. In addition the heat treating process
affected the recast layer and HAZ to be recrystallized but softening occurred in recast layer only. A metallurgical evaluation
of the microstructure for the altered material zone was also conducted. |
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Keywords: | Electrical Discharge Machining Hastelloy-X Pulse-on Time Recast Layer Surface Integrity |
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