First-principles study of the stability, electronic and mechanical properties of Cr2N and CrN with the variation of Ni doping concentration

Zhang, Zhaolu; He, Guangyu; Chen, Jiao

doi:10.1016/j.ceramint.2021.05.158

Cited by 2 publications

(1 citation statement)

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“…There were four phases to be calculated: S-phase, γ'-Fe 4 N, ε-Fe 3 N and CrN. The crystalline structures of these phases were built according to descriptions in references [21][22][23][24]. It should be pointed out that the S-phase was treated as a solid solution with randomly distributed nitrogen atoms and closely distributed chromium atoms around nitrogen atoms.…”

Section: First Principles Calculationsmentioning

confidence: 99%

High-Efficient Gas Nitridation of AISI 316L Austenitic Stainless Steel by a Novel Critical Temperature Nitriding Process

Tang,

Zhang,

Zhan

et al. 2023

Coatings

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To improve the surface properties of austenitic stainless steels, a thick S-phase layer was prepared by using a novel critical temperature nitriding (CTN) process. The properties of the thick S-phase layer were optimized by controlling the process parameters. The microstructures and phase compositions of CTN-treated layers were characterized by the optical microscope, scanning electron microscope and X-ray diffraction, respectively. The surface properties, including corrosion and wear resistance, were systematically investigated by the electrochemical workstation, micro-hardness tester and ball-on-disk tribometer, respectively. The results showed that a thick S-phase layer with a thickness of 18 to 25 μm can be fabricated in a short time by critical temperature nitriding, which represented higher efficiency than conventional low-temperature nitriding. Although the most top surfaces of CTN-treated layers contain massive iron nitrides, there are no precipitates in the inner nitrided layer. The electronic work function calculated by first-principles method has confirmed that those iron nitrides had a slight influence on the corrosion resistance of nitrided layers. The optimized CTN-treated layer exhibited a comparable corrosion resistance and wear resistance as the low-temperature nitrided layer. The CTN process is considered a potentially highly efficient surface modification method for austenitic stainless steels.

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Section: First Principles Calculationsmentioning

confidence: 99%