Electro Discharge Machining – A Suitable Fabrication Process for High‐Pressure/High‐Temperature Equipment

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 ammonoth...

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Veröffentlicht in:Chemical engineering & technology 2018-05, Vol.41 (5), p.994-1002
Hauptverfasser: Hertweck, Benjamin, Kimmel, Anna-Carina L., Steigerwald, Thomas G., Alt, Nicolas S. A., Schlücker, Eberhard
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Sprache:eng
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Zusammenfassung: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. Ammonothermal reactors are mainly made of nickel‐based alloys which are classified as hard‐to‐cut materials. Therefore, advanced manufacturing processes like electro discharge machining became more important for efficient fabrication processes. Regarding its suitability, this powerful manufacturing tool was evaluated successfully for high‐pressure, high‐temperature, and high‐purity processes.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.201700680