Publication Date:
2018-03-14
Description:
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 makes it suitable as material for manufacturing of pressure 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, this article includes the finding of suitable post processing, namely honing, to achieve high stability of the surface at high pressure atmosphere.
Print ISSN:
0930-7516
Electronic ISSN:
1521-4125
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology