With the aim of modifying the microstructure and improving the corrosion performance of a wire arc additive manufactured 420 martensitic stainless steel, heat treatment cycles consisting of austenitizing at 1,150°C followed by air cooling and subsequent tempering at different temperatures (300°C, 400°C, 500°C, and 600°C) were applied to the as-printed alloy. Microstructural analysis revealed that the austenitization and subsequent air-cooling treatment led to the removal of retained austenite and delta ferrite from the as-printed structure, while the tempering process resulted in the precipitation of a variety of carbide particles at different tempering temperatures. Electrochemical tests performed in an aerated 3.5 wt% NaCl solution showed that tempering at 400°C led to the highest corrosion resistance, while tempering at 500°C deteriorated the alloy’s resistance against localized corrosion. The most stable passive layer was found to form on the 400°C tempered sample due to the uniformity of Cr-concentration in the formed carbide precipitates and their surrounding matrix. However, Cr-rich carbide precipitates formed in the 500°C tempered sample were found to deteriorate the passive film stability throughout the immersion time in the electrolyte.
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1 September 2022
Research Article|
July 09 2022
Effect of the Tempering Process on the Corrosion Performance of Wire Arc Additively Manufactured 420 Martensitic Stainless Steel Available to Purchase
Jonas Lunde;
Jonas Lunde
‡
*Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, Newfoundland Labrador A1B 3X5, Canada.
‡Corresponding author. Email: [email protected].
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Salar Salahi;
Salar Salahi
*Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, Newfoundland Labrador A1B 3X5, Canada.
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Alireza Vahedi Nemani;
Alireza Vahedi Nemani
**Department of Mechanical Engineering, Dalhousie University, 1360 Barrington St., Halifax, Nova Scotia B3H 4R2, Canada.
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Mahya Ghaffari;
Mahya Ghaffari
**Department of Mechanical Engineering, Dalhousie University, 1360 Barrington St., Halifax, Nova Scotia B3H 4R2, Canada.
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Ali Nasiri
Ali Nasiri
*Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, Newfoundland Labrador A1B 3X5, Canada.
**Department of Mechanical Engineering, Dalhousie University, 1360 Barrington St., Halifax, Nova Scotia B3H 4R2, Canada.
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‡Corresponding author. Email: [email protected].
Online ISSN: 1938-159X
Print ISSN: 0010-9312
© 2022, AMPP
2022
CORROSION (2022) 78 (9): 850–864.
Citation
Jonas Lunde, Salar Salahi, Alireza Vahedi Nemani, Mahya Ghaffari, Ali Nasiri; Effect of the Tempering Process on the Corrosion Performance of Wire Arc Additively Manufactured 420 Martensitic Stainless Steel. CORROSION 1 September 2022; 78 (9): 850–864. https://doi.org/10.5006/4033
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