Contemporary Industrial Application of Nitriding and Its Modifications

Michalski, Jerzy; Wach, P.; Tacikowski, J.; Betiuk, M.; Burdyński, K.; Kowalski, Stefan Jan; Nakonieczny, A.

doi:10.1080/10426910902844203

Cited by 19 publications

(11 citation statements)

References 2 publications

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“…Nitriding process is well-known as a technique of surface treatment that improves the mechanical properties of metallic materials [1]. The most common methods of nitriding are as follows: controlled gas nitriding [2][3][4][5][6], plasma nitriding [7][8][9][10][11][12], and low-pressure gas nitriding [13,14]. Controlled gas nitriding and low-pressure gas nitriding is commonly used for constructional and tool steels.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of thick and porous ε (Fe 2-3 N) iron nitrides was particularly inadvisable. Therefore, in recent years, controlled gas nitriding has been intensively developed [2][3][4][5][6]. The process parameters, characteristic of the nitriding atmosphere, were as follows: the nitriding potential (K N ), the ammonia dissociation rate (α), the percentage composition of gaseous components of the atmosphere, and the flow rate (F In ).…”

Section: Introductionmentioning

confidence: 99%

“…The process parameters, characteristic of the nitriding atmosphere, were as follows: the nitriding potential (K N ), the ammonia dissociation rate (α), the percentage composition of gaseous components of the atmosphere, and the flow rate (F In ). Such a process enabled the control and regulation of the growth of the nitrided layer using the changeable value of the nitriding potential [2,3,6]. It also guaranteed the repeatability of the phase composition at specified nitriding parameters.…”

Section: Introductionmentioning

confidence: 99%

“…The nitriding potential was used to control the kinetics of the nitriding process. Its suitable selection was very important to control not only the growth kinetics of the diffusion zone, but also the thickness and phase composition of the iron nitride zone (compound zone) [2,3,6,15]. Phase composition of the compound zone (with iron nitrides) strongly influenced the hardness of the layer close to the surface.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Temperature Distribution during Laser Heat Treatment of Gas-Nitrided 42CrMo4 Steel on the Microstructure and Mechanical Properties

et al. 2020

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A gas-nitrided layer was produced on the toughened 42CrMo4 low-alloy steel using the changeable nitriding potential in order to limit the thickness of a brittle ε zone. The microstructure consisted of the compound ε + (ε + γ’) zone and diffusion zone (nitric sorbite with γ’ precipitates). Such a layer was subjected to laser heat treatment with or without remelting. The single laser tracks were formed using various laser beam powers (in the range of 0.234–0.624 kW) and scanning rates (in the range of 2.24–3.84 m·min−1) and the same laser beam diameter (2 mm). The microstructure of laser-modified nitrided layer usually consisted of re-melted zone (MZ) with coarse-grained nitric martensite Feα’ and possible ε precipitates, heat-affected zone (HAZ) with fine-grained nitric martensite Feα’ and γ’ precipitates and diffusion zone with nitric sorbite and γ’ precipitates. Sometimes, the compound zone was partially re-melted and an amount of iron nitrides remained in the MZ. Only one laser track was characterized by the different microstructure, consisting of the compound ε + (ε + γ’) zone, HAZ with fine-grained nitric martensite Feα’ and γ’ precipitates and diffusion zone with nitric sorbite and γ’ precipitates. This laser track was formed without visible effects of remelting. The effect of temperature distribution during laser heat treatment of gas-nitrided 42CrMo4 steel on the microstructure and mechanical properties was studied. The equations developed by Ashby and Esterling were used in order to determine the temperature distribution along the axis of each laser track. Taking into account the temperature profiles, it was possible to calculate the depths of MZ and HAZ. These predicted values were compared to those-measured based on the microstructure observations, obtaining good compatibility. The microstructure of the produced surface layers influenced the mechanical properties such as hardness and Young’s modulus. The hardness of MZ was higher than that of ε zone and lower than that of ε + γ’ zone when compared to nitrided layer. Whereas Young’s modulus of MZ was significantly higher than those characteristic of the compound zone in gas-nitrided layer (both ε and ε + γ’ zone) and similar to that of HAZ. The laser heat treatment (LHT) without remelting resulted in the similar hardness and slightly higher Young’s modulus of ε zone in comparison with the nitrided layer. Simultaneously, such a treatment of the nitrided layer did not influence the hardness and the Young’s modulus of ε + γ’ zone considerably. The hardness of HAZ was higher than that of MZ and that of the same area of diffusion zone in the nitrided layer because of the presence of fine-grained nitric martensite with γ’ precipitates after laser quenching.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Temperature Distribution during Laser Heat Treatment of Gas-Nitrided 42CrMo4 Steel on the Microstructure and Mechanical Properties

et al. 2020

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“…During the nitriding process control can be effected only on the flux of nitrogen from the atmosphere to the surface of the steel being nitrided [1-3]. Gas nitriding can accomplished utilizing four types of ingoing atmospheres: single component atmosphere composed of only ammonia (NH 3 ), a two-component atmosphere composed of ammonia and pre-dissociated ammonia (NH 3 -NH 3diss ), a two-component atmosphere composed of ammonia and nitrogen (NH 3 − N 2 ) and a tri-component atmosphere composed of ammonia with nitrogen and pre-dissociated ammonia (NH 3 − N 2 -NH 3diss ) [4].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Availability Of Nitriding Atmosphere In Controlled Gas Nitriding Processes

Michalski¹,

Burdyński²,

Wach³

et al. 2015

Archives of Metallurgy and Materials

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Parameters which characterize the nitriding atmosphere in the gas nitriding process of steel are: the nitriding potential K N , ammonia dissociation rate α and nitrogen availabilitym N2 . The article discusses the possibilities of utilization of the nitriding atmosphere's nitrogen availability in the design of gas nitriding processes of alloyed steels in atmospheres derived from raw ammonia, raw ammonia diluted with pre-dissociated ammonia, with nitrogen, as well as with both nitrogen and pre-dissociated ammonia. The nitriding processes were accomplished in four series. The parameters selected in the particular processes were: process temperature (T ), time (t), value of nitriding potential (K N ), corresponding to known dissociation rate of the ammonia which dissociates during the nitriding process (α). Variable parameters were: nitrogen availability (m N2 ), composition of the ingoing atmosphere and flow rate of the ingoing atmosphere (F In ).Keywords: Controlled gas nitriding, Nitrogen availability, Nitriding potential, Ammonia dissociation rate, Alloyed steels Parametrami charakteryzującymi atmosferę azotującą w procesie azotowania gazowego stali są: potencjał azotowy K N , stopień dysocjacji amoniaku α oraz rozporządzalność azotu m N2 . W artykule omówiono możliwości wykorzystania rozporzą-dzalności azotu atmosfery azotującej w projektowaniu procesów azotowania gazowego stali stopowych w atmosferach azotują-cych uzyskanych z amoniaku, z amoniaku rozcieńczonego zdysocjowanym amoniakiem, azotem oraz azotem i zdysocjowanym amoniakiem. Procesy azotowania wykonano w czterech seriach. Parametrami ustalonymi w poszczególnych seriach była temperatura procesu (T ), czas (t), wartość potencjału azotowego (K N ), któremu odpowiada określona wartość stopnia dysocjacji amoniaku zdysocjowanego podczas procesu azotowania (α). Parametrami zmiennymi była rozporządzalność azotu (m N2 ), skład atmosfery wlotowej i natężenie przepływu atmosfery azotującej wlotowej (F w ).

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Wear Resistance, Hardness, and Residual Stress of Shot-Peened and Heat-Treated 8620 Nickel-Chromium-Molybdenum Steel

Varol Özkavak

2024

J. of Materi Eng and Perform

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Contemporary Industrial Application of Nitriding and Its Modifications

Cited by 19 publications

References 2 publications

The Effect of Temperature Distribution during Laser Heat Treatment of Gas-Nitrided 42CrMo4 Steel on the Microstructure and Mechanical Properties

The Effect of Temperature Distribution during Laser Heat Treatment of Gas-Nitrided 42CrMo4 Steel on the Microstructure and Mechanical Properties

Nitrogen Availability Of Nitriding Atmosphere In Controlled Gas Nitriding Processes

Wear Resistance, Hardness, and Residual Stress of Shot-Peened and Heat-Treated 8620 Nickel-Chromium-Molybdenum Steel

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