Improvement of mechanical properties of martensitic stainless steel by plasma nitriding at low temperature

Xi, Yuntao; Liu, D.X.; Han, Donghoon; Han, Zi-ang

doi:10.1016/s1006-7191(08)60015-0

Cited by 53 publications

(31 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hence, the use of plasma nitriding is limited to the low temperature range, where only the formation of the S-phase (also called expanded austenite -γ N ) occurs 1,12,13 . The S-phase formation on austenitic stainless steels by advanced nitriding treatments has been the subject of several studies [1][2][3][4][5][6][7][8][9][10][11][12][13] . Theo focus of this work is not the study of the S-phase itself, rather the SHTPN process as an alternative to low temperature plasma nitriding.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Surface Enrichment of Austenitic Stainless Steel ISO 5832-1: SHTPN vs Low-temperature Plasma Nitriding

et al. 2015

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Nitrogen Surface Enrichment of Austenitic Stainless Steel ISO 5832-1: SHTPN vs Low-temperature Plasma Nitriding

et al. 2015

View full text Add to dashboard Cite

“…The increased corrosion and wear resistance observed for lowtemperature plasma treatments of stainless steels is attributed to metastable phases formation on the treated surface [5]. In the case of low temperature plasma nitriding application on martensitic stainless steels, the nitrogen incorporation leads to the formation of nitrogen expanded martensite phase ('N), which presents high wear [6,7], corrosion [7][8][9], and fatigue resistance [10]. For low-temperature plasma carburizing of martensitic stainless steel, the carbon introduction on the steel surface promotes the formation of carbon expanded martensite phase ('C) [11][12][13], whose tribological properties and corrosion resistance remain undetermined.…”

Section: Introductionmentioning

confidence: 99%

Micro-Abrasive Wear Behaviour of Low-Temperature Plasma Carburized Aisi 420 Martensitic Stainless Steel

Scheuer¹,

Cardoso²,

Neves³

et al. 2017

Anais Do Congresso Anual Da ABM

View full text Add to dashboard Cite

Experiments were carried out aiming to study the influence of micro-abrasive wear test variables and plasma treatment parameters, on the tribological characteristics of low-temperature plasma carburized AISI 420 steel. The first part of this study was conducted in order to evaluate the influence of abrasive particle size, normal load and counter body rotation speed on carburized sample wear behavior; and the second part was conducted in order to evaluate the treatment temperature and time effect on carburized samples wear behavior. Plasma carburizing treatments were performed at 8 and 12 h, for temperatures ranging from 350 to 500°C; and at constant temperatures of 400°C for times between 12 to 48h, and for 450°C for times of 4 to 16h. Micro-abrasive wear test were performed by mean of a calowear ballcratering equipment using a polished ball of AISI 52100 steel rotating at 80, 120 and 160 rpm, for sliding distances from 2.6 to 104.2 m. Alumina abrasive particles with sizes of 0.05, 0.3 and 1.0 m were employed. The normal loads applied on this study were 0.1, 0.3 and 0.5 N. Carburized sample was characterized by mean of OM, XRD and hardness measurements. Worn crater characteristics were evaluated by confocal laser microscopy. Results showed that the transient wear regime prevails along the outer layer length (composed by Fe3C and 'C), and the steady-state wear stabilizes in the diffusion layer region (composed by 'C). It was verified that the wear rate and wear coefficient decreases with treatment temperature in the range of 350-450°C and increase for 500°C. It was also verified that the wear rate and wear coefficient decreases with treatment time in the range of 12-36 h (for 400°C cycle) and 4-12 h (for 450°C cycle), and increase for larger treatment times due the chromium carbide precipitation. It was also found that the wear coefficient increases with the increase of abrasive particle size, and decrease with the increase in counter body rotation speed and normal load. Lastly, the analysis of the worn craters indicates the occurrence of grooving and micro-rolling abrasion wear mechanisms.

show abstract

Section: Introductionunclassified

“…Este fato, aliado a baixa dureza e propriedades tribológicas, limita sua aplicabilidade. Várias técnicas vêm sendo empregadas com o objetivo de melhorar as características superficiais destes aços por meio da adição de nitrogênio em solução sólida [1][2][3][4][5][6][7].A adição de nitrogênio aos aços inoxidáveis austeniticos traz melhoras expressivas em propriedades tais como a resistência a corrosão por pite, corrosão sob tensão e fadiga [8].Nos aços inoxidáveis austeniticos o nitrogênio melhora a resistência à corrosão intergranular, pois retarda a precipitação de fases intermetálicas, além do que, a precipitação de nitretos traz uma perda menor no teor de cromo da matriz que na precipitação de carbonetos [8]. A resistência à corrosão localizada e ainda Autor Responsável: Ricardo Fernando dos Reis Data de envio:…”

unclassified

Obtenção de austenita expandida (fase S): Nitretação por plasma em baixa temperatura x SHTPN - Parte 2

Reis

Durante

2015

Matéria (Rio J.)

View full text Add to dashboard Cite

RESUMOCorpos de prova de aço inoxidável austenítico ISO 5832-1 apresentando camada superficial rica em nitrogê-nio (fase S), obtidas pelos processos de nitretação por plasma em baixa temperatura e SHTPN (Solution Heat Treatment after Plasma Nitriding), caracterizadas em trabalho anterior, além de amostras na condição de fornecimento, ou seja, solubilizadas, e amostras nitretadas por plasma em 750 ºC por 3 horas foram testadas quanto à resistência a corrosão. A resistência a corrosão foi avaliada com base no método de polarização potenciodinâmica e obtenção de potencial de circuito aberto (E corr vs tempo) em uma solução de 0,5 M NaCl. Os resultados comprovaram o ganho na resistência a corrosão localizada proveniente do nitrogênio em solução sólida, tanto para nitretação em baixa temperatura quanto no processo SHTPN, bem como o efeito deleté-rio proveniente da precipitação do nitreto de cromo. Palavras-chave:Nitretação por plasma, SHTPN, fase "S", ISO 5832-1, corrosão. ABSTRACTSamples of austenitic stainless steel ISO 5832-1 showing nitrogen-rich surface layer (S-phase), obtained by plasma nitriding at low temperature and SHTPN (Solution Heat Treatment after Plasma Nitriding) processes, characterized in previous work, and samples in starting microstructure, in other words, solubilized and plasma samples nitrided at 750° C for 3 hours, were tested for corrosion resistance. The corrosion resistance was evaluated based on the potentiodynamic anodic polarization test and open circuit measurements of corrosion potential (OCP) using 0.5 M NaCl. The results confirmed the gain in localized corrosion resistance from the nitrogen in solid solution in both low-temperature nitriding and SHTPN process, as well as from the deleterious effect of precipitation of chromium nitride.Keywords: Plasma nitriding, SHTPN, S-phase, ISO 5832-1, corrosion. INTRODUÇÃOOs aços inoxidáveis austeníticos são vastamente empregados na indústria por possuírem excelente resistência à corrosão; entretanto, dependendo do meio ao qual estão expostos, podem sofrer corrosão por pite e / ou frestas. Este fato, aliado a baixa dureza e propriedades tribológicas, limita sua aplicabilidade. Várias técnicas vêm sendo empregadas com o objetivo de melhorar as características superficiais destes aços por meio da adição de nitrogênio em solução sólida [1][2][3][4][5][6][7].A adição de nitrogênio aos aços inoxidáveis austeniticos traz melhoras expressivas em propriedades tais como a resistência a corrosão por pite, corrosão sob tensão e fadiga [8].Nos aços inoxidáveis austeniticos o nitrogênio melhora a resistência à corrosão intergranular, pois retarda a precipitação de fases intermetálicas, além do que, a precipitação de nitretos traz uma perda menor no teor de cromo da matriz que na precipitação de carbonetos [8]. A resistência à corrosão localizada e ainda Autor Responsável: Ricardo Fernando dos Reis Data de envio:

show abstract

Improvement of mechanical properties of martensitic stainless steel by plasma nitriding at low temperature

Cited by 53 publications

References 12 publications

Nitrogen Surface Enrichment of Austenitic Stainless Steel ISO 5832-1: SHTPN vs Low-temperature Plasma Nitriding

Nitrogen Surface Enrichment of Austenitic Stainless Steel ISO 5832-1: SHTPN vs Low-temperature Plasma Nitriding

Micro-Abrasive Wear Behaviour of Low-Temperature Plasma Carburized Aisi 420 Martensitic Stainless Steel

Obtenção de austenita expandida (fase S): Nitretação por plasma em baixa temperatura x SHTPN - Parte 2

Contact Info

Product

Resources

About