The corrosion response of the heterogeneous nitriding structure originated from the laser additive manufactured steel

Y Hong,D.D Dong,G.P Zou,Y Li,S.S Lin,T.C Kuang,Y.Z Wu,M.J Dai

doi:10.1016/j.corsci.2023.111188

The corrosion response of the heterogeneous nitriding structure originated from the laser additive manufactured steel

Y Hong, D.D Dong + Show 6 more

https://doi.org/10.1016/j.corsci.2023.111188

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Journal: Corrosion Science	Publication Date: Apr 15, 2023
Citations: 6

Affiliation: Guangdong Academy of Sciences, Guangdong Institute of New Materials, South China University of Technology, Hunan Institute of Technology, University of Technology

#Laser Additive Manufactured #Plasma Nitriding + Show 8 more

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Abstract

Corrosion of the laser additive manufactured (LAM) steel attracts increasing attentions. In this work, plasma nitriding was carried out to improve the strength and corrosion resistance of LAM 18Ni300 maraging steel at the same time. Nitriding of the as-fabricated sample obtains a heterogeneous nitriding structure with typical LAM dendrite boundaries. Nanosized N-rich grains and associated N-depleted grains were found along the LAM dendrite boundaries, which are beneficial for pitting resistance. Moreover, the corrosion reaction of the nitrided surface is confirmed as γ′/γ + O → MeO(N) + Me+, (Me = Fe, Co, Ni, Mo).

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