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The International Journal of Advanced Manufacturing Technology

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24-08-2022 | ORIGINAL ARTICLE

Performance and increased fatigue life for a Ti workpiece produced by the EDM process

Authors: Zhi-Wei Liu, Chung-Wei Hsu, Shang-Hua Wu, Jia-Sheng Zhou, Jin-Yih Kao, Chun-Yao Hsu

Published in: The International Journal of Advanced Manufacturing Technology | Issue 3-4/2022

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Abstract

The effect of the discharge current (ranging from 5 to 13 A) in electrical discharge machining (EDM) on the machining characteristics of pure Ti is investigated. With an increased discharge current, the electrode wear rates (ranging from 0.15 to 0.73 mg/min), material removal rates (ranging from 1.37 to 5.30 mg/min), surface roughness (ranging from Ra = 3.47 to Ra = 5.91 μm), and recast layer thickness (ranging from 19.12 to 48.52 μm) also increased. However, the EDMed surface micro-hardness decreased from 269 Hv (discharge current 5 A) to 216 Hv (discharge current 13 A), which is due to the electrical discharge coating effect. Control charts are used to ensure the EDM process is well regulated and stable. The EDMed surface is modified by plasma etching and the surface defects are gradually removed, so the fatigue life increases from 66 to 80 times, an improvement of 21.2%. The sample by plasma etching and then TiAlN hard coating has better surface quality and a significantly greater fatigue life.

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Title: Performance and increased fatigue life for a Ti workpiece produced by the EDM process
Authors: Zhi-Wei Liu
Chung-Wei Hsu
Shang-Hua Wu
Jia-Sheng Zhou
Jin-Yih Kao
Chun-Yao Hsu
Publication date: 24-08-2022
Publisher: Springer London
Published in: The International Journal of Advanced Manufacturing Technology / Issue 3-4/2022
Print ISSN: 0268-3768
Electronic ISSN: 1433-3015
DOI: https://doi.org/10.1007/s00170-022-09999-z

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