Low-temperature plasma nitrocarburizing of the AISI 420 martensitic stainless steel: Microstructure and process kinetics

Anjos, Adriano David dos; Scheuer, Cristiano; Brunatto, Sílvio Francisco; Cardoso, Rodrigo Perito

doi:10.1016/j.surfcoat.2015.03.039

Cited by 52 publications

(19 citation statements)

References 29 publications

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“…Optical microscope (OM) and scanning electron microscope (SEM) are used to analyze the microstructure of the specimens and Vilella's etchant (5 ml HCL + 1 gm picric acid in 100 ml. ethanol) is used to reveal the microstructure of AISI 4140 and hardfacing materials [24]. Optical microscopy of both the samples is carried out with the magnification of x200.…”

Section: Methodsmentioning

confidence: 99%

Investigations on Wear Behaviour of AISI 4140 Hot Strip Mill Roller Hardfaced with Martensitic Stainless Steel by Submerged Arc Welding Process

Patel¹,

Wanare²,

Калыанкар³

2021

Tribol. Ind.

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Section: Methodsmentioning

confidence: 99%

Investigations on Wear Behaviour of AISI 4140 Hot Strip Mill Roller Hardfaced with Martensitic Stainless Steel by Submerged Arc Welding Process

Patel¹,

Wanare²,

Калыанкар³

2021

Tribol. Ind.

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“…Kim et al 14 showed that the activation energy for low-temperature RF-plasma nitriding of AISI 420 steel is 33.4 kJmol -1 , for treatment condition of 350 to 500 °C and 4 h. Activation energy of 60.0, 92.0 and 164.0 kJmol -1 was verified for low-temperature dc-plasma nitriding (at 300 to 500 °C, and 4 h treatment time) of as-quenched, tempered and annealed AISI 420 steel samples, respectively 36 . On the other hand, and activation energy of 84 kJmol -1 was obtained for lowtemperature dc-plasma nitrocarburizing (at 300 to 450 °C, and 4 h treatment time) of AISI 420 steel samples 37 . It is important to bear in mind that for the treatments to which no nitride/carbide precipitation occurs, the volume diffusion of nitrogen/carbon through the modified layer is the main phenomenon, affecting significantly the process kinetics.…”

Section: Treatment Temperature (°C)mentioning

confidence: 98%

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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“…Meanwhile, La enhances the surface bombardment effect, increasing the crystal defects such as vacancies and dislocations and further reducing the N content in the nitrided layer, which accelerates the diffusion of N atoms and produces solid solution strengthening. Thus, the thickness of compound and effective hardening layer is increased, and the nitriding process is accelerated [19,20].…”

Section: Semmentioning

confidence: 99%

Low-Temperature Plasma Nitriding of 3Cr13 Steel Accelerated by Rare-Earth Block

You

Yan

et al. 2021

Coatings

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The plasma nitriding of 3Cr13 steel occurred at 450 °C for 4, 8 and 12 h in NH3 with and without rare earth (RE). The nitrided layers were characterized using an OM, SEM, TEM, XRD, XPS, microhardness tester and electrochemical workstation. The modified layer, with and without La, are composed of a compound layer and diffusion layer from surface to core. After the addition of La during nitriding, the maximum increase of layer thickness, mass gain and average microhardness was 15.6%, 35.8% and 212.50HV0.05, respectively. With the increase of the proportion of ε-Fe2-3N, the passivation zone of the corrosion resistance curve increases from 2.436 to 3.969 V, the corrosion current density decreases, the corrosion potential and pitting potential both increase, and, consequently, the corrosion resistance is significantly improved. Most of the surface microstructures of the nitrided layer was refined by the addition of La. The presence of La reduces the N content in the modified layer, which accelerates the diffusion of N atoms and, thus, accelerates the nitriding process.

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Low-temperature plasma nitrocarburizing of the AISI 420 martensitic stainless steel: Microstructure and process kinetics

Cited by 52 publications

References 29 publications

Investigations on Wear Behaviour of AISI 4140 Hot Strip Mill Roller Hardfaced with Martensitic Stainless Steel by Submerged Arc Welding Process

Investigations on Wear Behaviour of AISI 4140 Hot Strip Mill Roller Hardfaced with Martensitic Stainless Steel by Submerged Arc Welding Process

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

Low-Temperature Plasma Nitriding of 3Cr13 Steel Accelerated by Rare-Earth Block

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