Electro Discharge Machining – A Suitable Fabrication Process for High‐Pressure/High‐Temperature Equipment |
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| Authors: | Benjamin Hertweck Anna-Carina L. Kimmel Thomas G. Steigerwald Nicolas S. A. Alt Eberhard Schlücker |
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| Affiliation: | 1. Friedrich-Alexander-University Erlangen-Nuremberg, Institute of Process Machinery and Systems Engineering, Erlangen, Germany;2. Hugo Kern und Liebers GmbH & Co. KG, Schramberg, Germany;3. Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen Graduate School in Advanced Optical Technologies (SAOT), Erlangen, Germany;4. Weihenstephan-Triesdorf University of Applied Sciences, Weidenbach, Germany |
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| Abstract: | Electro discharge machining (EDM) is an important manufacturing process for hard‐to‐cut materials like nickel‐based alloys, e.g., alloy 718. Its high yield strength at high temperature make it a suitable material for vessels for high‐pressure/high‐temperature applications, in particular for ammonothermal pressure vessels. This report first summarizes the relationship between microstructure and properties of alloy 718 for practitioners. Second, it focuses on the metallographic description of alloy 718 surfaces proceeded by EDM and its behavior during use as equipment for ammonoacidic systems. Furthermore, the finding of suitable post‐processing, namely honing, to achieve high stability of the surface at high‐pressure atmosphere is included. |
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| Keywords: | Ammonothermal crystal growth Electro discharge machining High‐pressure equipment High‐temperature corrosion Nickel‐based alloys |
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