Plasma nitriding of plastic mold steel to increase wear- and corrosion properties

Wen, Dong

doi:10.1016/j.surfcoat.2009.08.023

Cited by 58 publications

(20 citation statements)

References 24 publications

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“…Nas três temperaturas de nitretação, a fase '-Fe4N foi a fase majoritária. Estudos anteriores relatam a importância de uma camada de compostos formada principalmente pela fase -Fe2-3N, no desempenho do material nitretado quanto ao desgaste e à corrosão [8]. Apesar da fase -Fe2-3N não ter sido a fase majoritária, sua concentração foi de 42% na amostra nitretada a 500°C, valor consideravelmente maior do que os valores em torno de 17% encontrados por outros autores em nitretação a plasma de aços baixo carbono [6,13].…”

Section: Análise Microestrutural Por Mevunclassified

“…Neste caso, tempo suficiente foi dado para a formação de nitretos, o que é facilitado pela cinética em altas temperaturas. Como discutido previamente, a fase '-Fe4N é apontada por alguns autores [2,8] como uma fase frágil e, portanto não é adequada para processos de conformação, além de possuir menor resistência ao desgaste e à corrosão quando comparada à fase -Fe2-3N. A caracterização estrutural realizada neste trabalho, em aços IF nitretados a plasma pré-deformados, permitiu indicar as fases presentes, suas quantidades e sua distribuição ao longo da profundidade da nitretação.…”

Section: Análise Microestrutural Por Mevunclassified

“…As características de resistência ao desgaste e à corrosão da camada nitretada dependem do tipo de nitreto formado na camada de compostos. A presença de nitretos -Fe2-3N é tribologicamente desejável, pois essa fase apresenta alta resistência à corrosão, ao deslizamento, além de elevada dureza [8], enquanto a fase '-Fe4N é conhecida por ser mais frágil do que a fase -Fe2-3N e, portanto, não adequada para processos de conformação [2,8]. Os aços interstitial free (IF) são amplamente utilizados na indústria automobilística, devido à sua excelente conformabilidade.…”

Section: Introductionunclassified

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Caracterização Estrutural De Aços Interstitial Free Nitretados a Plasma

Manfridini¹,

Godoy²,

Santos³

2018

ABM Proceedings

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ResumoA formação de nitretos na superfície de aços Interstitial Free (IF) nitretados a plasma em função da temperatura de tratamento foi investigada. Amostras de aço IF estabilizados ao Ti, laminado a frio e com shot peening foram nitretadas a plasma nas temperaturas de 450°C, 475°C e 500°C durante 4 horas. A camada nitretada resultante foi caracterizada por microscopia eletrônica de varredura (MEV), difração de raios-X (DRX) e método Rietveld. As imagens de MEV revelaram duas principais regiões na camada nitretada formada nas três temperaturas de tratamento: uma camada de compostos constituída de -Fe2-3N e '-Fe4N e uma camada de difusão apresentando uma matriz ferrítica com finos precipitados de ''-Fe16N2. Através da DRX, foi observada uma variação na proporção das fases -Fe2-3N e '-Fe4N. A partir de análises Rietveld, foi sugerido que a maior temperatura de nitretação facilitou a formação de nitretos -Fe2-3N, uma vez que a quantidade dessa fase aumentou de 475°C para 500°C. A presença deste precipitado com maior teor de nitrogênio sugere uma possível maior aplicabilidade dos aços IF. Palavras-chave: Aço IF; Caracterização estrutural; Nitretação a plasma; Rietveld Method. STRUCTURAL CHARACTERIZATION OF PLASMA NITRIDED INTERSTITIAL FREE STEELS AbstractThe formation of nitrides in the surface of plasma nitrided IF steels as a function of the temperature was investigated. Three cold-rolled Ti-stabilized IF steel plates were plasma nitrided after shot peening for 4h at three different temperatures: 450°C, 475°C, and 500°C. The resultant nitrided layers were then characterized by scanning electron microscopy (SEM), X-ray diffraction (DRX), and Rietveld Method. SEM images revealed two main sublayers in the nitrided layer formed at the three conditions: a compound layer constituted of -Fe2-3N and '-Fe4N, and a diffusion layer presenting a ferritic matrix with fine ''-Fe16N2 precipitates. Through XRD, it was observed a variation of proportion between -Fe2-3N and '-Fe4N. From the Rietveld analysis, it was suggested that higher nitriding temperatures facilitate the formation of -Fe2-3N, once its quantity increased from 475°C to 500°C. It can be interesting, because the applicability of nitrided IF steels can be broadened.

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Section: Análise Microestrutural Por Mevunclassified

Section: Introductionunclassified

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Caracterização Estrutural De Aços Interstitial Free Nitretados a Plasma

Manfridini¹,

Godoy²,

Santos³

2018

ABM Proceedings

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“…So-called white layer (compound layer) is created on the surface of treated component and consists of ε-Fe 2−3 N and γ-Fe 4 N phase. The layer is characterized by high hardness and fragility (aluminium alloyed steels reaching the surface hardness up to 1500 HV), with good wear resistance and anticorrosion properties [1][2][3]. Beneath the compound layer the diffusion layer is created, *Corresponding author: e-mail address: vojtech.hruby@unob.cz which consists of dispersive iron nitrides and nitrides of alloying elements with high affinity to nitrogen [4].…”

Section: Introductionmentioning

confidence: 99%

“…The properties and nitride layers composition are influenced mostly by the nitriding gas mixture composition and by the nitriding process conditions like temperature, voltage, nitriding duration and by the surface conditions [3,5]. Monitoring of surface roughness parameters like Pa, Ra and Wa (µm) has been demonstrated an increase of these parameters after plasma nitriding process [6].…”

Section: Introductionmentioning

confidence: 99%

Corrosion resistance of surface treated 42CrMo4 steel

Kusmič¹,

Hruby²,

Bachárová³

2016

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This article deals with corrosion resistance comparison of plasma nitrided 42CrMo4 steel to another surface technologies used for breech mechanism manufacturing in the armament production. Increasing of demands on materials used for armament production and in other industrial applications leads to the innovation of technologies in the field of surface treatment, especially wear resistance, surface hardness, running-in properties and corrosion resistance, optical demands and others. For the evaluation of experimental corrosion resistance were plasma nitrided samples of 42CrMo4 steel compared with alkali blackening, manganese phosphate and Arcor technologies. The conditions of plasma nitriding process were set to provide exactly defined nitride layers with defined parameters. In this case, the above-mentioned surface technologies were applied to individual samples of 42CrMo4 steel, which were subsequently metallographically evaluated and the hardness and microhardness were measured. The corrosion resistance comparison was realized by the NSS corrosion tests in the condensation chamber and visually evaluated. The results and comparison of corrosion resistance of plasma nitrided steel samples with above-mentioned surface treatment technologies showed significant differences in corrosion rate propagation. Thank to different plasma nitriding conditions, there are evident differences in corrosion resistance between the plasma nitrided steel samples as well. The corrosion resistance evaluation is supplemented by the surface layer characteristics. K e y w o r d s : plasma nitriding, breech mechanism, corrosion resistance

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Electrochemical corrosion behaviour of innovative mould steels in a chloride‐containing environment

Rosalbino

Scavino

Mortarino

2012

Materials & Corrosion

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Investigations concerning the electrochemical corrosion behaviour of mould steels are scarce and limited. In the present study the corrosion resistance of an innovative mould steel (a microalloyed steel, steel 2), devoted to the fabrication of large size moulds, and a steel having the same composition without microalloying elements (B, Zr, Nb, steel 3), proposed for small size moulds, was assessed in a chloride‐containing environment and compared with that of the traditional 1.2738 steel. Potentiodynamic polarization and electrochemical impedance spectroscopy measurements were carried out on the investigated steel samples in a 0.1 M NaCl solution at 25 °C. Scanning electron microscopy and electron probe microanalysis were used to characterize the specimens surface after the electrochemical tests. Despite having a bainitic microstructure, the electrochemical corrosion behaviour of the investigated steels is quite different. Results showed that the steel 3 and the 1.2738 steel samples exhibit the best and the worst electrochemical corrosion behaviours compared to the steel 2 sample. The presence of pearlite is considered as the main reason for the poor corrosion behaviour showed by the 1.2738 steel sample, due to galvanic coupling phenomena between this phase and the bainitic matrix which experiences preferential dissolution. The coarse bainitic microstructure characterizing the steel 2 sample is responsible for its lower corrosion resistance as compared with the steel 3 sample exhibiting a finer bainitic microstructure.

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Plasma nitriding of plastic mold steel to increase wear- and corrosion properties

Cited by 58 publications

References 24 publications

Caracterização Estrutural De Aços Interstitial Free Nitretados a Plasma

Caracterização Estrutural De Aços Interstitial Free Nitretados a Plasma

Corrosion resistance of surface treated 42CrMo4 steel

Electrochemical corrosion behaviour of innovative mould steels in a chloride‐containing environment

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