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Mechanical and Microstructural Characterization of Arc-Welded Inconel 625 Alloy

Department of Materials Test Engineering (WPT), TU Dortmund University, Baroper Str. 303, D-44227 Dortmund, Germany
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Materials 2019, 12(22), 3690; https://doi.org/10.3390/ma12223690 (registering DOI)
Received: 25 October 2019 / Revised: 4 November 2019 / Accepted: 6 November 2019 / Published: 8 November 2019
The objective of this work was to verify a relatively new fusion-based additive manufacturing (AM) process to produce a high-temperature aerospace material. The nickel-based superalloy Inconel 625 (IN625) was manufactured by an arc-based AM technique. Regarding microstructure, typical columnar-oriented dendritic structure along the building direction was present, and epitaxial growth was visible. The mechanical behavior was characterized by a combination of quasi-static tensile and compression tests, whereas IN625 showed high yield and ultimate tensile strength with a maximum fracture strain of almost 68%. Even quasi-static compression tests at room and elevated temperatures (650 °C) showed that compression strength only slightly decreased with increasing temperature, demonstrating the good high-temperature properties of IN625 and opening new possibilities for the implementation of arc-based IN625 in future industrial applications. View Full-Text
Keywords: additive manufacturing; arc welding; mechanical behavior; high-temperature alloy additive manufacturing; arc welding; mechanical behavior; high-temperature alloy
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Kotzem, D.; Beermann, L.; Awd, M.; Walther, F. Mechanical and Microstructural Characterization of Arc-Welded Inconel 625 Alloy. Materials 2019, 12, 3690.

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