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

J. R. J. Michla, N. Rajini, Sikiru O. Ismail, T. R. Prabhu, F. Mohammad , S. Siengchin, M. P. I. Devi

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Abstract

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.
Original languageEnglish
Article number133258
Pages (from-to)1-5
Number of pages5
JournalMaterials Letters
Volume330
Early online date29 Sept 2022
DOIs
Publication statusPublished - 1 Jan 2023

Keywords

  • Additive manufacturing
  • Corrosion
  • Grain boundaries
  • Microstructure
  • Nitriding

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