The effect of thin surface layer of nitrogen-expanded austenite on bulk γ-α’ phase transformation in low-temperature deformation of 316L stainless steel

Moskvina, Valentina; Maier, Galina; Melnikov, E.; Астафуров, С. В.; Zagibalova, E. A.; Panchenko, M. Yu.; Reunova, K. A.; Nikolaev, A. A.; Рамазанов, К. Н.; Астафурова, Е. Г.

doi:10.1016/j.matlet.2021.130676

Cited by 6 publications

(1 citation statement)

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“…The S phase is a solid solution of nitrogen (not a nitride compound), which does not affect the passive-film-forming ability of chromium in stainless steel. Thus, high corrosion resistance is maintained, and pitting corrosion in chlorinated environments is inhibited [19][20][21][22][23][24][25][26][27][28]. In a previous study, AISI 316L stainless-steel-based tungsten carbide composite layers fabricated via laser metal deposition were subjected to low-temperature plasma nitriding, and the formation of the S phase was confirmed at temperatures of 400-450 • C and a processing time of 4 h [29].…”

Section: Introductionmentioning

confidence: 97%

Effects of Solid-Solution Carbon and Eutectic Carbides in AISI 316L Steel-Based Tungsten Carbide Composites on Plasma Carburizing and Nitriding

Adachi

Yamaguchi

Tanaka

et al. 2023

Metals

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AISI 316L stainless-steel-based tungsten carbide composite layers fabricated via laser metal deposition are used for additive manufacturing. Heat treatment practices such as low-temperature plasma carburizing and nitriding improve the hardness and corrosion resistance of austenitic stainless steels via the formation of expanded austenite, known as the S phase. In the present study, practices to enhance the hardness and corrosion resistances of the stainless-steel parts in the composite layers have been investigated, including single plasma carburizing for 4 h and continuous plasma nitriding for 3.5 h following carburizing for 0.5 h at 400 and 450 °C. The as-deposited composite layers contain solid-solution carbon and eutectic carbides owing to the thermal decomposition of tungsten carbide during the laser metal deposition. The eutectic carbides inhibit carbon diffusion, whereas the original solid-solution carbon contributes to the formation of the S phase, resulting in a thick S phase layer. Both the single carburizing and continuous processes are effective in improving the Vickers surface hardness and corrosion resistance of the composite layers despite containing the solid-solution carbon and eutectic carbides.

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