Orientation dependence of nitrogen supersaturation in austenitic stainless steel during low-temperature gas-phase nitriding

Wu, Dee H.; Kahn, H.; Dalton, J. C.; Michal, G. M.; Ernst, F.; Heuer, A. H.

doi:10.1016/j.actamat.2014.07.007

Cited by 64 publications

(62 citation statements)

References 35 publications

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“…This disproportional lattice expansion could be due to the plasma surface heating that resulted in a temperature gradient especially during the first hour of nitriding,the formation of the nitrided layer was initiated from room temperature before rising up to about 420℃. Activation and diffusion mechanisms for the different crystal sites may well have been stimulated in sequence as the temperature increased.These results are in good agreement with the measurements of other researchers as shown in literature [49][50][51] . Thirdly, it is noticed that the  values measured at the fixed glancing angle are systematically smaller than those measured at the -2 mode.…”

Section: Scanning Electron Microscopy Of Nitrided Samplessupporting

confidence: 83%

Effect of Nitriding Time on the Structural Evolution and Properties of Austenitic Stainless Steel Nitrided Using High Power Pulsed DC Glow Discharge Ar/N2 Plasma

Yang

Kitchen

Luo

et al. 2016

J. Coat. Sci. Technol.

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A high power pulsed DC glow discharge plasma (HPPGDP) system was employed to perform fast nitriding of AISI 316 austenitic stainless steel in Ar and N2 atmosphere. In-situ optical emission spectroscopy and Infrared pyrometer measurements were used during the plasma nitriding to investigate the effect of dynamic plasma on the nitriding behaviour. SEM and EDX, XRD, Knoop indentation, and tribo-tests were used to characterize microstructures and properties of the nitrided austenitic stainless steel samples.HPPGDP produced high ionization of both Ar and N2in the plasma that corresponded to dense ion bombardment on the biases steel samples to induce effective plasma surface heating and to form high nitrogen concentration on the biased steel surfaces, and therefore fast nitriding (> 10µm/hour) was achieved. Various phases were identified on the nitrided stainless steel samples formed from a predominantly a single phase of nitrogen supersaturated austenite toa multi-phase structure comprising chromium nitride, iron nitride and ferrite dependent on the nitriding time. All the nitrided AISI 316 austenitic stainless steel samples were evaluated with high hardness (up to 17.3 GPa) and exceptional wear resistance sliding to against hardened steel balls and tungsten carbide balls.

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Section: Scanning Electron Microscopy Of Nitrided Samplessupporting

confidence: 83%

Effect of Nitriding Time on the Structural Evolution and Properties of Austenitic Stainless Steel Nitrided Using High Power Pulsed DC Glow Discharge Ar/N2 Plasma

Yang

Kitchen

Luo

et al. 2016

J. Coat. Sci. Technol.

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show abstract

“…In contrast to other surface treatments such as gas nitriding, salt bath nitriding, carbonitriding, and nitrocarburising [12][13][14][15] , in plasma nitriding temperature is not dependent of a conventional heat source. Plasma energy is the heat source and process temperature can be adjusted with plasma voltage and pressure in addition to an external heat source.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Plasma Nitrided Layers on the Tribological Performance of DLC Coatings

et al. 2016

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When multifunctional surface engineering processes that combine purpose-oriented phases are applied to soft substrates, a combination of high wear resistance, high load support and low coefficients of friction can be achieved. In this study, the effects of different nitrided layers on the tribological behaviour of a diamond-like carbon (DLC) film deposited on a SAE 1040 steel were investigated. The nitriding was carried out under different temperatures and gas mixtures to create three distinct nitrided layers: two compound layers with predominant ε and γ' phases and a diffusion layer. All of the surfaces were then coated with DLC deposited via plasma-enhanced chemical vapour deposition (PECVD). The tribological tests indicated that the best performance was achieved for a specific combination of hardness, surface roughness and nitride type. The best load-bearing capacity between the DLC coating and the soft substrate was achieved when the nitrided layer was primarily a diffusion layer.

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“…Uma solução que envolve progressivamente aumentar a dureza superficial e criar um suporte mecânico é a nitretação a plasma, um tratamento termoquímico difusivo que aumenta a dureza superficial de aços e ligas metálicas [10][11]. Em contraste com outros tratamentos superficiais como a nitretação gasosa, nitretação por banho de sal, carbonitretação e nitrocarbonetação [12][13][14][15], a nitretação a plasma não induz transformação de fase e apenas modifica as propriedades superficiais, portanto produz mínimas distorções dimensionais nas peças tratadas, e que são normalmente causadas por alívio de tensões se temperaturas acima de 600°C são utilizadas [10]. Portanto, nitretação a plasma é uma técnica interessante utilizada para produzir revestimentos multicamadas para componentes empregados em aplicações de alta precisão.…”

Section: Introductionunclassified

Efeitos De Diferentes Camadas Nitretadas Por Plasma No Desempenho Tribológico De Revestimentos Diamond Like Carbon (Dlc)

Shioga¹,

Binder²,

Hammes³

et al. 2018

ABM Proceedings

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ResumoQuando processos de engenharia de superfícies multifuncionais que combinam fases de propósito orientadas são aplicados a substratos moles, uma combinação de alta resistência ao desgaste, suporte de alta carga e baixos coeficientes de atrito podem ser obtidos. Neste estudo, os efeitos de diferentes camadas nitretadas no comportamento tribológico de revestimento Diamond-Like-Carbon (DLC) depositado sobre aço SAE 1040 são investigados. A nitretação foi conduzida sob diferentes temperaturas e misturas de gases para criar três camadas de nitretos distintas: duas camadas de compostos com predominância de fases ε e γ' e uma camada de difusão. Todas as superfícies foram então revestidas com DLC, depositado via Plasma-Enhanced-Chemical-Vapour-Deposition (PACVD). As fases de nitreto foram analisadas utilizando difração de raios-X e a topografia da superfície foi analisada por interferometria de luz branca e microscopia eletrônica de varredura. O comportamento tribológico foi investigado utilizando esfera e plano com movimento alternado com carregamento incremental até a falha do filme DLC. Os testes tribológicos indicaram que o melhor desempenho foi alcançado por uma específica combinação de dureza, rugosidade superficial e tipo de nitreto. A melhor capacidade de mancalização entre o revestimento DLC e o substrato mole foi alcançada quando a camada de nitretos constitui-se apenas de uma camada de difusão. Palavras-chave: DLC; Nitretação; Rugosidade; Atrito; Adesão. EFFECTS OF DIFFERENT PLASMA NITRIDE LAYERS ON THE TRIBOLOGICAL PERFORMANCE OF DLC COATINGS AbstractWhen multifunctional surface engineering processes that combine purpose-oriented phases are applied to soft substrates, a combination of high wear resistance, high load support and low coefficients of friction can be achieved. In this study, the effects of different nitride layers on the tribological behaviour of a diamond-like carbon (DLC) film deposited on a SAE 1040 steel were investigated. The nitriding was carried out under different temperatures and gas mixtures to create three distinct nitride layers: two compound layers with predominant ε and ' phases and a diffusion layer. All of the surfaces were then coated with DLC deposited via plasma-enhanced chemical vapour deposition (PACVD). The nitride phases were analysed using X-ray diffraction, and the surface topography was analysed by white-light interferometry and scanning electron microscopy. The tribological behaviour was evaluated using a ball on a reciprocating plane with incremental loading until each DLC film failed. The tribological tests indicated that the best performance was achieved for a specific combination of hardness, surface roughness and nitride type. The best load-bearing capacity between the DLC coating and the soft substrate was achieved when the nitride layer was primarily a diffusion layer.

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Orientation dependence of nitrogen supersaturation in austenitic stainless steel during low-temperature gas-phase nitriding

Cited by 64 publications

References 35 publications

Effect of Nitriding Time on the Structural Evolution and Properties of Austenitic Stainless Steel Nitrided Using High Power Pulsed DC Glow Discharge Ar/N2 Plasma

Effect of Nitriding Time on the Structural Evolution and Properties of Austenitic Stainless Steel Nitrided Using High Power Pulsed DC Glow Discharge Ar/N2 Plasma

Effects of Different Plasma Nitrided Layers on the Tribological Performance of DLC Coatings

Efeitos De Diferentes Camadas Nitretadas Por Plasma No Desempenho Tribológico De Revestimentos Diamond Like Carbon (Dlc)

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