Effects of nitriding on salt spray corrosion resistance of additively manufactured 17-4 PH steels

Michla, J. R. J., Rajini, N., Ismail, Sikiru O., Prabhu, T. R., Mohammad, F., Siengchin, S. and Devi, M. P. I. (2023) Effects of nitriding on salt spray corrosion resistance of additively manufactured 17-4 PH steels. Materials Letters, 330: 133258. pp. 1-5. ISSN 0167-577X

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This work addresses the effects of varying nitriding temperatures of 530, 560 and 580 ◦C for 2 h on corrosion resistance of additively manufactured (AM) 17-4 PH steels, using neutral salt spray (NSS) method for 104 h. The morphological analysis indicated the presence of columnar grains along the built direction of additive manufacturing process. The refined grain size and the amount of the precipitates increased with an increasing nitriding temperature. The results of the analysis showed that a minimum weight loss was observed at 580 ◦C, due to the formation of passive oxide layer and nitrogen rich precipitates on the surface. The X-ray diffraction (XRD) showed the presence of these compounds: Cr2N, (Fe, Cr)4N, (Fe, Cr)2-3N, Fe2O3, FeOOH, and Cr2O3 on the nitrided sample after the salt spray test.

Item Type	Article
Additional information	© 2022 Published by Elsevier B.V. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1016/j.matlet.2022.133258
Keywords	additive manufacturing, corrosion, grain boundaries, microstructure, nitriding, general materials science, condensed matter physics, mechanics of materials, mechanical engineering
Date Deposited	15 May 2025 15:02
Last Modified	04 Jun 2025 17:17