Improvement of erosion and erosion–corrosion resistance of AISI420 stainless steel by low temperature plasma nitriding

Xi, Yuntao; Liu, Daoxin; Han, Dong

doi:10.1016/j.apsusc.2008.03.189

Cited by 69 publications

(28 citation statements)

References 13 publications

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“…The as-quenched sample presents a typical peak related to the martensite phase (α′), which is in agreement with Xi et al [18][19][20] . XRD data revealed peak reflections related to Fe 3 C phase for all studied carburizing treatment conditions.…”

Section: Resultssupporting

confidence: 79%

Low-temperature Plasma Assisted Thermochemical Treatments of AISI 420 Steel: Comparative Study of Obtained Layers

2015

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Formation of metastable C-, N-, or even Formation of metastable C-, N-, or even C/N-expanded phases can be observed for typical non-equilibrium conditions attained at the plasma assisted thermochemical treatments when temperatures relatively low are used. In present work, kinetics data are considered in a comparative study comprising low-temperature plasma assisted carburizing, nitriding and nitrocarburizing of AISI 420 martensitic stainless steel samples treated at 350, 400, and 450 °C, aiming to put in evidence the main metallurgical differences of the obtained layers. Microstructural characterization and hardness measurement results for untreated and treated sample surfaces show significant difference for the carburized layer growth in relation to that verified for the nitrided and nitrocarburized layers. While the carburized layer is constituted of a thin outer layer and a deep diffusion layer, just the opposite was observed for the other two treatments, id est., formation of thicker outer layers and thinner diffusion layers. Finally, carbide-/nitride-precipitation-free layers were supposedly obtained for samples carburized, nitrided, and nitrocarburized at 350 °C temperature.

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Section: Resultssupporting

confidence: 79%

Low-temperature Plasma Assisted Thermochemical Treatments of AISI 420 Steel: Comparative Study of Obtained Layers

2015

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“…Plasma nitriding processes are also characterized by their low treatment temperatures [17]. In particular this advantage is of prime importance for stainless steels, for which the passive-ability inherent to high chromium contents may be lost by diffusion processes [18][19][20]. Gontijo et al [21], for instance, indicated that treating 304 L stainless steels within the 450-500°C temperature range preserved its original passive nature.…”

Section: Introductionmentioning

confidence: 99%

Plasma nitriding of 90CrMoV8 tool steel for the enhancement of hardness and corrosion resistance

Nouveau

Steyer

Rao

et al. 2011

Surface and Coatings Technology

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The aim of the study is to apply a plasma nitriding process to the 90CrMoV8 steel commonly employed in wood machining, and to determine its efficiency to improve both mechanical and electrochemical properties of the surface. Treatments were performed at a constant N 2 :H 2 gas mixture and by varying the temperature and process duration. The structural and morphological properties of nitrided layers were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) coupled with EDS microanalyses. Surface hardening and hardness profiles were evaluated by micro hardness measurements. To simulate the wood machining conditions, electrochemical tests were carried out with an oak wood electrolyte with the purpose of understanding the effects of the nitriding treatment on the corrosion resistance of the tool in operation. X-ray diffraction analyses revealed the presence of both γ′ (Fe 4 N) and ε (Fe 2-3 N) nitrides with a predominance of the ε phase. Moreover, α-Fe (110), γ′ and ε diffraction peaks were shifted to lower angles suggesting the development of compressive stresses in the post nitrided steel. As a result, it was shown that nitriding allowed a significant hardening of steel with hardness values higher than 1200 HV. The diffusion layers were always composed of an outer compound layer and a hardened bulk layer which thickness was half of the total diffusion layer one. No white layer was observed. Similarly, no traces of chromium nitrides were detected. The temperature seemed to be a parameter more influent than the process duration on the morphological properties of the nitrided layer, while it had no real influence on their crystallinity. Finally, the optimal nitriding conditions to obtain a thick and hard diffusion layer are 500°C for 10 h. On the other hand, to verify the effect of these parameters on the corrosion resistance, potentiodynamic polarization tests were carried out in an original "wood juice" electrolyte. After corrosion, surface was then observed at the SEM scale. Electrochemical study indicated that the untreated steel behaved as a passive material. Although the very noble character of steel was somewhat mitigated and the corrosion propensity increased for nitrided steels, the passive-like nature of the modified surface was preserved. For the same optimized parameters as those deduced from the mechanical characterization (500°C, 10 h), surface presented, in addition to a huge surface hardening, a high corrosion resistance.

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“…Boriding and plasma nitriding are used in numerous applications in industries such as the manufacture of machine parts for plastics and food processing, packaging and tooling, as well as pumps and hydraulic machine parts, crankshafts, rolls and heavy gears, motor and car construction, cold and hot working dies and cutting tools. The corrosion behavior of plasma nitrided and borided steels has been evaluated by a number of investigators [15][16][17][18][19][20][21] . However, there is no information about the corrosion behaviors of plasma nitrided and borided AISI M2 steel.…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior and characterization of plasma nitrided and borided AISI M2 steel

2014

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This study investigates the corrosion behaviors of plasma nitrided (PN) and borided AISI M2 steels. The PN process was carried out in a dc-plasma system at a temperature of 923K for 6 h in a gas mixture of 80%N 2 -20%H 2 under a constant pressure of 5 mbar. The boriding process was carried out in Ekabor-II powder at a temperature of 1223K for 6 h. X-ray diffraction analysis on the surface of the PN and borided steels revealed the presence of FeB, Fe 2 B, CrB, MoB, WB, FeN, Fe 2 N, Fe 3 N and Fe 4 N compounds. Corrosion surfaces of the samples were analyzed using a SEM microscopy and X-ray energy dispersive spectroscopy EDS. The corrosion resistance of PN and borided AISI M2 steel is higher compared with that of untreated AISI M2 steel. Corrosion resistances of the PN and borided AISI M2 steel increased the 4-6-fold.

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Improvement of erosion and erosion–corrosion resistance of AISI420 stainless steel by low temperature plasma nitriding

Cited by 69 publications

References 13 publications

Low-temperature Plasma Assisted Thermochemical Treatments of AISI 420 Steel: Comparative Study of Obtained Layers

Low-temperature Plasma Assisted Thermochemical Treatments of AISI 420 Steel: Comparative Study of Obtained Layers

Plasma nitriding of 90CrMoV8 tool steel for the enhancement of hardness and corrosion resistance

Corrosion behavior and characterization of plasma nitrided and borided AISI M2 steel

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