Austenitic nitriding and nitrocarburizing of steels

Schneider, Reinhold

doi:10.1533/9780857096524.3.373

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…One of the chemical and thermal treatment methods of metals and alloys is a high-speed process of nitrocarburizing to obtain reinforced layers with high microhardness [17] and wear resistance [18].…”

Section: Statement Of the Goal And Objectives Of The Studymentioning

confidence: 99%

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Influence of Nitrocarburizing on Increasing the Service Life of Elastic Elements of Direct Flow Valves

Krmela¹,

Говорун²,

Berladir³

et al. 2021

Manufacturing Technology

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The effect of the nitrocarburizing process in pastes with heating in a chamber furnace on the structure and strength characteristics of 09Cr15Ni8Al corrosion-resistant steel was investigated. The technology of thermochemical treatment was developed, which included nitrocarburizing in pastes with heating in a chamber furnace at different holding times. The thickness of the diffusion layer and its microhardness were determined after nitrocarburizing. To determine the efficiency and select the modes of thermochemical treatment, tests were carried out for the investigated steel's strength characteristics. The main feature of the structure of the diffusion layers of valve steels, obtained by nitrocarburizing in the nitrogencarbon paste, is the presence of an inhomogeneous layer with clearly distinguished zones.

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Section: Statement Of the Goal And Objectives Of The Studymentioning

confidence: 99%

“…Nitrocarburizing is characterized by a diverse combination of control factors [18]. In this regard, it is difficult to provide experimentally the optimal choice of technological mode.…”

Section: Statement Of the Goal And Objectives Of The Studymentioning

confidence: 99%

Influence of Nitrocarburizing on Increasing the Service Life of Elastic Elements of Direct Flow Valves

Krmela¹,

Говорун²,

Berladir³

et al. 2021

Manufacturing Technology

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“…En los aceros al carbono (AISI 10xx) y los aceros aleados Cr-Ni-Mo (AISI 4xxx) la nitrocarburación ferrítica (FNC) se suele realizar a temperaturas entre 500 y 590 °C, mientras que la nitrocarburación austenítica (ACN) se lleva a cabo entre 590 ºC y 700 °C (Fattah y Mahboubi, 2010;Schneider, 2014). En ambos casos se forma una capa externa, capa de compuestos, que da al material resistencia a la corrosión y al desgaste, y una zona interna de difusión que aumenta la resistencia a la fatiga del acero (Mittemeijer, 2013;Brühl et al, 2016).…”

Section: Introductionunclassified

Estudio comparativo de la nitrocarburación de los aceros AISI 4340 y AISI 347 mediante el proceso Tenifer-QPQ®

Bellas¹,

Castro²,

Mera³

et al. 2019

REVMETAL

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Este trabajo estudia las diferencias microestructurales y tribológicas de las capas formadas durante la nitrocarburación ferrítica del acero aleado AISI 4340 y la nitrocarburación austenítica del acero inoxidable estabilizado AISI 347. Las muestras se sometieron a distintos tiempos de inmersión en un baño de nitrocarburación (60, 75, 90, 105 y 120 min) a 580 ºC. Posteriormente se sometieron a un proceso de oxidación a 480 ºC para formar una capa de Fe3O4. Los estudios de la microestructura de la capa nitrocarburada se realizaron por microscopía electrónica de barrido (SEM), espectroscopía de dispersión de energías (EDS) y difracción de rayos X (XRD). Se estudió el desgaste y el coeficiente de fricción de las muestras nitrocarburadas y las muestras no tratadas mediante el ensayo pink-on disk. Los resultados muestran tres zonas bien diferenciadas en el acero AISI 4340: una capa de óxidos externa, una capa blanca o de combinación y zona de difusión. Sin embargo, no se detectó la presencia de la capa de combinación en el acero AISI 347. En ambos aceros, el coeficiente específico de desgaste (k) de las muestras nitrocarburadas fue aproximadamente treinta veces menor que el de las muestras de referencia.

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Understanding crack growth within the γ′ Fe4N layer in a nitrided low carbon steel during monotonic and cyclic tensile testing

Varanasi,

Koyama,

Yokoi

et al. 2024

J Mater Sci

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Nitriding is a cost-effective method to realize simultaneous improvements in tensile and fatigue properties and resistance to abrasion and corrosion. Previous studies reported that nitriding pure Fe enhances tensile strength by ~ 70% and fatigue limit by ~ 200%. It is due to the increase in surface hardness caused by the formation of γ′(Fe4N) and ε(Fe2-3N) nitrogen-containing intermetallic compound phases. However, the intermetallic compound layer is prone to brittle-like cracking. To better design nitrided steels, it is crucial to identify the crack growth mechanisms via analysis of the microstructural crack growth paths within the ~ 4–6 µm thick nitride layer. In the current work, we statistically evaluate the crack propagation behavior in the γ′ Fe4N layer during monotonic and cyclic tensile deformation in nitrided low-carbon steel (0.1 wt% C). Since nitriding typically results in the formation of columnar grains, the effect of morphology needs to be clarified. To this end, the steel was shot-peened and subsequently nitrided to promote equiaxed nitride grains morphology (~ 16% increase). Crack growth paths were comparatively evaluated for multiple cracks, and no significant effect of nitride morphology was observed. {100}γ′ is the predominant transgranular crack path in the monotonic tensile tested specimen, followed by {111}γ′. It is despite the elastic modulus of {111}γ′ < {100}γ′. This contrary behavior is explained by {100}γ′ plane having the lowest surface energy (density functional theory calculations). In the cyclic tensile loaded specimen, experiments revealed that transgranular cracking along {100}γ′ (cracking via symmetric dislocation emission) or {111}γ′ (slip plane cracking) is equally likely. Graphical abstract

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Austenitic nitriding and nitrocarburizing of steels

Cited by 3 publications

References 5 publications

Influence of Nitrocarburizing on Increasing the Service Life of Elastic Elements of Direct Flow Valves

Influence of Nitrocarburizing on Increasing the Service Life of Elastic Elements of Direct Flow Valves

Estudio comparativo de la nitrocarburación de los aceros AISI 4340 y AISI 347 mediante el proceso Tenifer-QPQ®

Understanding crack growth within the γ′ Fe4N layer in a nitrided low carbon steel during monotonic and cyclic tensile testing

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