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The Effect of Microstructural Imperfections on Corrosion Fatigue of Additively Manufactured ER70S-6 Alloy Produced by Wire Arc Deposition

1
Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
2
Department of Engineering, University of Cambridge, Trumpington Street, CB2 1PZ Cambridge, UK
*
Author to whom correspondence should be addressed.
Metals 2020, 10(1), 98; https://doi.org/10.3390/met10010098
Received: 6 December 2019 / Revised: 29 December 2019 / Accepted: 30 December 2019 / Published: 8 January 2020
This study aims at evaluating the effect of microstructure imperfections on the corrosion fatigue performance of an ER70S-6 alloy produced by wire arc additive manufacturing (WAAM) process, in a 3.5% NaCl solution. For reference, a regular ST-37 alloy with relatively similar chemical composition was considered as a counterpart alloy. This was justified by the fact that the ER70S-6 alloy is usually used for conventional welding of ST-37 steel. The results obtained indicated that while the ST-37 alloy exhibited fatigue strength of 240 MPa in the corrosive solution, the additively manufactured ER70S-6 alloy showed fatigue strength of only 140 MPa. These differences were related to microstructural imperfections that are inherently produced during the WAAM process.
Keywords: additive manufacturing; ER70S-6; corrosion; fatigue; steel; wire arc deposition; direct energy deposition additive manufacturing; ER70S-6; corrosion; fatigue; steel; wire arc deposition; direct energy deposition
MDPI and ACS Style

Ron, T.; Levy, G.K.; Dolev, O.; Leon, A.; Shirizly, A.; Aghion, E. The Effect of Microstructural Imperfections on Corrosion Fatigue of Additively Manufactured ER70S-6 Alloy Produced by Wire Arc Deposition. Metals 2020, 10, 98.

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