Effect of cooling rate on properties of plasma nitrided AISI 1010 steel

Alves, Clodomiro; Lima, João Alberto Lins de; Hajek, V.; Cunha, J.B.M. da; Santos, Carlos Alberto dos

doi:10.1016/j.surfcoat.2007.02.036

Cited by 14 publications

(5 citation statements)

References 12 publications

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“…Open circuit potential measurement provides efficient information about surface electrochemistry conditions in different simulated body fluids. Using the Ivium potentiostat multi-channel device, electrochemical experiments were conducted in various simulated body fluids to compare the corrosion behaviour of the plasma nitride and untreated samples [25][26][27][28][29][30]. The procedure was carried out utilizing a three-electrode setup, with the working electrode being the samples (both as-received and plasma nitrided), the counter electrode being platinum (Pt), and the reference electrode being Ag/AgCl (stored in KCl solution).…”

Section: Electrochemical Behaviour Of Aisi 316l In Different Simulate...mentioning

confidence: 99%

“…A layer generated by austenite expansion because of the presence of nitrogen atoms is followed by a layer formed by austenite extending because of the presence of carbon atoms, according to research by Waldemar Alfredo Monteiro et al [24] on the materials AISI 304 and 316 Austenitic Stainless Steels. According to the analysis of XRD samples by V. Singh et al [27], CrN begins to precipitate at processing temperatures of 500 • C and significantly greater nitrogen contents [39,40].…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

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Mapping the Accouterment Effects of Plasma Nitriding on AISI 316L in Biomedical Applications

2023

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The present study aimed to critique the corrosion resistance of plasma-nitrided films of AISI 316L stainless steel with regards to their biomedical applications. The plasma nitriding process improves austenitic stainless steel’s micro-hardness and corrosion resistance. Austenitic stainless steel was treated at a temperature of 470 °C for 12, 24, and 36 h, to observe the outcomes of plasma nitriding. The corresponding microstructure, microhardness, depth of the nitrided layer, and electrochemical parameters were systematically characterized. The corrosion resistance of the plasma-nitrided specimens was gauged using the weight loss method in simulated body fluids (Phosphate-buffered saline (PBS), saline water, and ringer solution) by static immersion for 9, 18, and 27 days. Optimization was catalogued using the Taguchi method L27 orthogonal array to determine the optimum combination of plasma nitriding time and immersion time in simulated body fluid. The material characterization showed that the corrosion resistance of the plasma-nitrided specimens improved with longer nitriding times by Tafel polarization curves. Microhardness was observed at 12, 24, and 36 h as 1060, 1150, and 1220 HV0.1. SEM, with an energy-dispersive X-ray analysis (EDS) used to characterize the surface before and after plasma nitriding testing. It was concluded that CrN, which precipitates during processing and contributes to the loss of chromium from the surrounding matrix and the onset of a corrosive environment, is the primary cause of this behaviour.

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Section: Electrochemical Behaviour Of Aisi 316l In Different Simulate...mentioning

confidence: 99%

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Mapping the Accouterment Effects of Plasma Nitriding on AISI 316L in Biomedical Applications

2023

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“…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]. Gontijo e colaboradores [6] obtiveram tendências semelhantes para longos tempos de nitretação.…”

Section: Análise Microestrutural Por Mevunclassified

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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“…Although both nitrides are equilibrium phases, information available on the FeN phase diagram is not always appropriate to predict the possible nitrides to be form on microalloyed steels, due to the presence of alloying elements which are strong nitride-forming elements. Alves et al 22 , studying an AISI 1010 plain steel plasma nitrided at different temperatures, showed that low nitrogen concentrations were suffice for the formation of the γ'-Fe 4 N cubic nitride, whereas a high nitrogen surface concentrations promoted the formation of ε-Fe 2-3 N hexagonal nitride.…”

Section: Morphologymentioning

confidence: 99%

Improving the Abrasive Wear Resistance of a Microalloyed Steel by Plasma Nitriding

2015

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The aim of this work was to study the micro-abrasive wear resistance of an API 5L X-70 microalloyed steel plasma nitrided under different conditions of time and temperature. Pulsed DC plasma nitriding experiments were performed under a treatment atmosphere of 10%N 2 + 90%H 2 , at temperatures of 410, 440 and 470 °C and for nitriding times of 1, 3 and 5h. The results show that plasma nitriding performed at 440 °C and 1h led to the formation of a compound layer constituted mainly of ε-Fe 2-3 N nitride and a diffusion zone with large needle-like nitride, offering the highest wear resistance. The amount of γ'-Fe 4 N phase was found to increase with the plasma nitriding time, decreasing the wear resistance of the material.

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Effect of cooling rate on properties of plasma nitrided AISI 1010 steel

Cited by 14 publications

References 12 publications

Mapping the Accouterment Effects of Plasma Nitriding on AISI 316L in Biomedical Applications

Mapping the Accouterment Effects of Plasma Nitriding on AISI 316L in Biomedical Applications

Caracterização Estrutural De Aços Interstitial Free Nitretados a Plasma

Improving the Abrasive Wear Resistance of a Microalloyed Steel by Plasma Nitriding

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