Microstructure and structural behavior of ion-nitrided AISI 8620 steel

Çelik, A.; Efeoğlu, İhsan; Şakar, Gürkan

doi:10.1016/s1044-5803(00)00091-7

Cited by 19 publications

(13 citation statements)

References 7 publications

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“…The interest of this treatment in the industrial applications justifies the number of studies which were devoted to this subject [1][2][3][4][5][6][7][8][9]. This reveals that the in-depth penetration crack resistance of hardening elements (N 2 ), of the hardness of these layers [4,5,6,8] as well as the distribution of the residual stresses [7,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…This reveals that the in-depth penetration crack resistance of hardening elements (N 2 ), of the hardness of these layers [4,5,6,8] as well as the distribution of the residual stresses [7,9,10]. This beneficial effect of the treatment can be reduced or even reversed under the overload conditions, representative of the transient mode of transmission systems (gears, shafts, etc...) [10,11,13,16,19].…”

Section: Introductionmentioning

confidence: 99%

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Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Steel

Terres¹

2017

IJMSA

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Abstract:Steel 42CrMo4, used in the manufacturing of transmission systems (gears), poses problems in service under specific cyclic stress conditions of the operating mode of its bodies. The treatment of ion nitriding during 20 hours with 520°C applied to 42CrMo4 steel in an untreated state (quenched and tempered) led to the formation of a compound layer (mixture of nitrides γ' and carbonitrides ε with irregular thickness evaluated at 5µm and a diffusion layer of depth equal to 295µm). In the diffusion layer, the presence of inserted nitrogen leads to the increase in hardness (3 times that of basic material) and to the creation of a compressive residual stress field (-400MPa). This superficial hardening does not modify the tensile mechanical characteristics of 42CrMo4 steel but renders it more sensitive to overload in fatigue. As a result, a 0.7% total deformation imposed corresponding to a loading level of 850MPa, constitutes the limit of gain in fatigue obtained by the ion nitriding considered.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Steel

Terres¹

2017

IJMSA

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“…As it can be followed in Figure 1 of Fe-N phase diagram, the braunite is the eutectoid of Fe 4 N and -phase, which forms during low-rate cooling after nitriding above the eutectoid temperature (592°C) of Fe-N system at 2.35 mass percent nitrogen content; according to Celik et al (2001), it can have a thickness of 50-60 µm. A braunite intermediate layer can be seen in Figure 2 (Liedtke et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…A braunite intermediate layer can be seen in Figure 2 (Liedtke et al, 2010). In the course of their research work, Celik et al (2001) stated that the thickness of the developed braunite layer decreased at identical heat treatment temperature but by increasing the duration of heat treatment (600°C at 1 h: 50-60 µm, 600°C at 8 h: 20-30 µm). During their microstructural-and X-ray diffraction (XRD) investigations, Fattah and Mahboubi (2010) detected that an intermediate layer called braunite was formed above 592°C in case of low-rate cooling.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the intermediate layers formed by austenitic nitrocarburising

Godzsák

Pekker

Cora

et al. 2016

IJMMP

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By nitriding the Fe-N system above the eutectoid temperature (592°C), an intermediate layer called (nitro)austenite is formed under the compound layer that can transform into braunite during low-rate cooling at eutectoid temperature. The two-phase complement of structure forming such a way -namely the braunite -is an eutectoid consisting of body-centred cubic -iron and Fe 4 N iron-nitride compound ( + ′). This poorly investigated texture and its formation was investigated. During our experiments, 100Cr6 and C105U steels were nitrocarburised above the eutectoid temperature (592°C). The conditions and properties of the formation of the developed intermediate layers, the microstructure and the distribution of the nitrogen and carbon in the specimens were investigated by using light optical microscopy (LOM), microhardness measurements, X-ray diffraction (XRD) method, scanning (SEM)-and transmission (TEM) electronmicroscopy and glow discharge optical emission spectrometry (GD-OES).

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“…It is a thermochemical process involving the diffusion of atomic nitrogen into the surface of materials to form a hard layer. Plasma nitriding process is one of the nitriding processes widely used in an industrial surface hardening process due to its beneficial features such as energy and labor savings, good reproducibility of the property of nitrided layer, and no requirement of antipollution equipment [5]. Therefore, the plasma nitriding process is applied to not only iron and steels but also nonferrous metal alloys such as nickel [6], titanium [7], etc.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Wear Behavior of Plasma Nitrided Nickel Based Dental Alloy

Kahraman

Karadeniz

2011

Plasma Chem Plasma Process

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In the present work, the plasma nitriding behavior of a nickel based dental alloy was investigated. Plasma nitriding experiments carried out under constant gas mixture (15% H 2 -85% N 2 ) for different process parameters including time (4, 6, 10, and 20 h) and temperature (400, 450, 500, and 550°C). Depending on nitriding parameters, it was found that triple or double layers formed on the surface of the samples. Increasing of treatment time and temperature has resulted in a double layer. c N1 layer was in formed all nitrided samples. However, c N2 layer is formed only at low temperatures and in short times. Layer growth of nickel based alloys increases until a critical time or a critical temperature reached. Above these critical values, it is observed that the layer thickness decreases. It was also found that plasma nitriding not only increases the surface hardness but also improves the wear resistance of nickel based dental alloy. The maximum wear resistance was observed at 400°C for 10 h due to the high hardness and thickness of the nitride layers.

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Microstructure and structural behavior of ion-nitrided AISI 8620 steel

Cited by 19 publications

References 7 publications

Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Steel

Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Steel

Investigation of the intermediate layers formed by austenitic nitrocarburising

Characterization and Wear Behavior of Plasma Nitrided Nickel Based Dental Alloy

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