Effect of the initial microstructure on the plasma nitriding behavior of AISI M2 high speed steel

Akbari, Alireza; Mohammadzadeh, Roghayeh; Templier, C.; Rivière, J.P.

doi:10.1016/j.surfcoat.2010.05.042

Cited by 49 publications

(31 citation statements)

References 40 publications

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“…As another important affecting parameter, diffusion coefficient of nitrogen into the quenched and tempered mould steel AISI P20 at 450˚C is D N = 1.57 × 10 -13 m 2 /s. It was reported that, the diffusion coefficient of nitrogen into bcc-ferrite at 450˚C is 1.18 × 10 -12 m 2 /s which is 7.5 times greater than D N calculated in this study [29].…”

Section: Resultscontrasting

confidence: 67%

“…Since that, the compressive residual stresses imposed by quenching and tempering thermal regime in normal direction to the surface and it consequently decrease the space between parallel atomic planes. The dominant and major diffusion path is mainly through these planes in the structure and since that, atomic diffusion is decreased noticeably [29].…”

Section: Resultsmentioning

confidence: 99%

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A Study on Formation and Growth Mechanism of Nitride Layers During Plasma Nitriding Process of Plastic Injection Mold Steel

Nayebpashaee

Soltanieh

Kheirandish

2015

Materials and Manufacturing Processes

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Ion nitriding modifies composition of surface layer in steel used in plastic mold application and this consequently improves their lifecycle. In this study, pulsed plasma nitriding technique was used to produce a protecting hard layer on AISI P20 steel at three process temperatures of 450°C, 500°C and 550°C for durations of 2.5, 5, 7.5 and 10 hours at a constant gas mixture of 75% N 2 -25% H 2 . Surface morphology was studied by optical and scanning electron microscope (SEM) and the phases formed on the surface layer were determined by X-Ray diffraction (XRD). Elemental depth profile was measured by techniques including EDS, WDS and GDS and for identifying hardness profile, micro-hardness variations from surface to core of samples were recorded. Results showed that, thickness of compound layer of plastic mould steel AISI P20 was negligible.Moreover in ion nitriding of AISI P20, nitride were formed and grown in some preferred directions and upward diffusion of carbon and downward diffusion of nitrogen occurred during ion nitriding of AISI P20. XRD results showed that, ε-nitride is the dominant phase after plasma nitriding in all strategies. Furthermore, ion nitriding improved Downloaded by [New York University] at 02:06 14 July 2015 2hardness of AISI P20 up to 3 times and as time and temperature increased, hardness and hardness depth of diffusion zone increased considerably.

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Section: Resultscontrasting

confidence: 67%

Section: Resultsmentioning

confidence: 99%

A Study on Formation and Growth Mechanism of Nitride Layers During Plasma Nitriding Process of Plastic Injection Mold Steel

Nayebpashaee

Soltanieh

Kheirandish

2015

Materials and Manufacturing Processes

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“…Ion beam nitriding leads to an increase in surface roughness, which can be explained by a number of different mechanisms which involve: volumetric expansion of the substrate lattice due to incorporation of N in solid solution and formation of nitrides, sputtering of the surface due to the impact of N ions during deposition, as well as redeposition of the sputtered material 25,26 . As the tribological system investigated (cemented carbide against TiN) involves materials of elevated hardness, the main wear mechanism appears to be abrasive, thus leading to appreciable breakup of the sharper coating asperities.…”

Section: Topography and Wearmentioning

confidence: 99%

Effect of Low Temperature Nitriding of 100Cr6 Substrates on TiN Coatings Deposited by IBAD

et al. 2015

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In this paper we studied the influence of pre-treating the surface of 100Cr6 steel by ion beam nitriding at low temperature (380°C) on the surface topography and wear resistance of thin TiN coatings deposited by reactive ion beam assisted deposition. The specimens were characterized by grazing incidence X-ray diffraction, scanning electron microscopy and atomic force microscopy. The wear resistance of the TiN-coated specimens was evaluated by means of ball on disc tests. The results showed that application of a preliminary ion beam nitriding treatment slightly increased the surface roughness but improved the wear resistance of the 100Cr6 steel due to the formation of a diffusion zone containing the γ'-Fe 4 N nitride combined with the TiN coating.

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“…The compound layer (white layer) is found at the surface with a thickness of some micrometers. In the diffusion zone the nitrogen atoms can be interstitially dissolved or precipitated as iron-(carbo-)nitrides, and most probably as (carbo-)nitrides of the main alloying elements 3,4 . The composition and thickness of the nitrided layers strongly depends on the steel type.…”

Section: Introductionmentioning

confidence: 99%

“…The composition and thickness of the nitrided layers strongly depends on the steel type. High alloyed steels, for example, exhibit high hardness due to dispersed alloy nitrides in the matrix and high surface residual stresses are generated in the compound and diffusion zones for these steels, which are the result of chemical composition gradients, stress fields around precipitates, volume changes and thermal effects 4 . In the case of low alloyed steels, the diffusion layer does not reach hardness values as high as the obtained when nitriding tool steels, for example 5 .…”

Section: Introductionmentioning

confidence: 99%

Metallurgical response of an AISI 4140 steel to different plasma nitriding gas mixtures

Skonieski

Santos

Hirsch³

et al. 2013

Mat. Res.

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Plasma nitriding is a surface modification process that uses glow discharge to diffuse nitrogen atoms into the metallic matrix of different materials. Among the many possible parameters of the process, the gas mixture composition plays an important role, as it impacts directly the formed layer's microstructure. In this work an AISI 4140 steel was plasma nitrided under five different gas compositions. The plasma nitriding samples were characterized using optical and scanning electron microscopy, microhardness test, X-ray diffraction and GDOES. The results showed that there are significant microstructural and morphological differences on the formed layers depending on the quantity of nitrogen and methane added to the plasma nitriding atmosphere. Thicknesses of 10, 5 and 2.5 µm were obtained when the nitrogen content of the gas mixtures were varied. The possibility to obtain a compound layer formed mainly by γ ' -Fe 4 N nitrides was also shown. For all studied plasma nitriding conditions, the presence of a compound layer was recognized as being the responsible to hinder the decarburization on the steel surface. The highest value of surface hardness -1277HV -were measured in the sample which were nitrided with 3vol.% of CH 4 .

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Effect of the initial microstructure on the plasma nitriding behavior of AISI M2 high speed steel

Cited by 49 publications

References 40 publications

A Study on Formation and Growth Mechanism of Nitride Layers During Plasma Nitriding Process of Plastic Injection Mold Steel

A Study on Formation and Growth Mechanism of Nitride Layers During Plasma Nitriding Process of Plastic Injection Mold Steel

Effect of Low Temperature Nitriding of 100Cr6 Substrates on TiN Coatings Deposited by IBAD

Metallurgical response of an AISI 4140 steel to different plasma nitriding gas mixtures

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