On plasma nitriding of steels

Berg, M.A. van den; Budtz-Jørgensen, C.; Reitz, H.; Schweitz, K. O.; Chevallier, J.; Kringhøj, P.; Bøttiger, J.

doi:10.1016/s0257-8972(99)00472-7

Cited by 101 publications

(47 citation statements)

References 10 publications

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“…3a,b,c): the compound zone, of about 4 μm, close to the surface, and the diffusion zone. The total nitriding layer thickness of about 300 μm was measured for sample cooled on the substrate holder, which is in good agreement with results obtained by Berg et al [11]. For rapidly cooled samples (b) and (c), no interface was observed between the diffusion zone and the untreated bulk.…”

Section: Resultssupporting

confidence: 90%

“…For each condition nitriding run there was one sample placed on the substrate holder. Samples were plasma nitrided in an 20%N 2 plus 80%H 2 atmosphere (total gases flow of 10 sccm) at pressure of 500 Pa (partial pressure of 100 Pa and 400 Pa for N 2 and H 2 , respectively), temperatures of 500 and 580°C, during 2 h. This concentration was choose because is a typical mixing for plasma nitriding [11].…”

Section: Methodsmentioning

confidence: 99%

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Effect of cooling rate on properties of plasma nitrided AISI 1010 steel

Alves

Lima

Hajek

et al. 2007

Surface and Coatings Technology

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Section: Resultssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Effect of cooling rate on properties of plasma nitrided AISI 1010 steel

Alves

Lima

Hajek

et al. 2007

Surface and Coatings Technology

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“…It is known that kinds of parameters, the time duration 2 , treatment temperature 3 , the specific gas composition 4 , the alloying elements and the initial microstructure of the materials all have a great effect on the surface microhardness and the depth of diffusion zone. The process of quenching and tempering (QT) is a widely used treatment to improve the properties of material and get a fine grain size to improve the strength of materials.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Fatigue Properties of Pre-Quenched-Tempered S45c Steel With Plasma Nitriding Treatment

Zhang

Murakami

2012

Int. J. Mod. Phys. Conf. Ser.

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Quenched and tempered (QT) S45C steel was processed by plasma nitriding (a mixture of 40%N 2 -60%H 2 , 400 Pa, 773 K) with two different durations: 8 h and 48 h. The microhardness, surface residual stress and nitriding layer compound were separately detected and the effect was discussed with the fatigue test result. The rotating bending fatigue properties was test with QT, QT nitiding 8 h, QT nitriding 48 h specimens. Fish-eye type crack formation occurred and the two crack initiation modes, fish-eye crack initiation and surface crack initiation, were observed by the scanning electron microscope and discussed. The result showed that the fatigue strength of QT specimens were improved by 54% at least compared with the untreated specimens. But the QT and un-QT have the mainly same fatigue strength in the same plasma nitriding condition, especially no-improvement with the 48 h plasma nitriding specimens.

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“…Plasma ion nitriding, a well-established commercial surface hardening process, can be used to improve wear and corrosion behaviour of moulds for plastic injection. In this process, by means of a glow discharge in a gas of N 2 and H 2 , with the steel (the cathode) at a temperature of the order of magnitude 500 8C, nitrogen can penetrate the surface and diffuse into the steel [3]. Under such conditions, the structure of the nitrided layers is such that the top nitrided layer, known as the compound layer, is composed mainly of gV -Fe 4 N and q-Fe 2-3 N as well as nitrides with alloying elements.…”

Section: Introductionmentioning

confidence: 99%

Microstructural, mechanical, and corrosion characterization of plasma-nitrided plastic injection mould steel

Öztürk

Onmuş

Williamson

2005

Surface and Coatings Technology

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Plasma nitriding can be used to improve wear and corrosion behaviour of moulds for plastic injection by modifying the near-surface layers of these materials. In this study, a ferritic stainless steel (X36CrMo17) was plasma nitrided at 520-540 8C for 15-18 h under various gas mixtures of N 2 +H 2 in an industrial nitriding facility. The nitrided layer microstructures, thicknesses, and strengths were studied by X-ray diffraction (XRD), conversion electron and X-ray Mfssbauer spectroscopies (CEMS and CXMS), cross-sectional scanning electron microscopy (SEM), and cross-sectional nanohardness measurements. The corrosion behaviour was investigated by a salt spray method. Combined Mfssbauer, XRD, and SEM analyses demonstrate that (Fe,Cr,Mn)-nitrides, the q-and gV -nitrides, the Fe 3 C-like carbide, and CrN are distributed in the top nitrided layers of several micron thickness. The CEMS and CXMS analyses clearly show the nearly complete decomposition of the surface and deeper layers into phase separated mixtures of pure bcc-Fe, (Fe,Cr,Mn)-nitrides, and CrN. The nitriding conditions with the gas composition N 2 /H 2 =1 produces the thickest nitrided layer (~135 Am) with enhanced corrosion protection. The nanohardness of the surface layers is found to be plateau-shaped and increased by about a factor of three in comparison to that of the substrate material. D

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On plasma nitriding of steels

Cited by 101 publications

References 10 publications

Effect of cooling rate on properties of plasma nitrided AISI 1010 steel

Effect of cooling rate on properties of plasma nitrided AISI 1010 steel

An Investigation of Fatigue Properties of Pre-Quenched-Tempered S45c Steel With Plasma Nitriding Treatment

Microstructural, mechanical, and corrosion characterization of plasma-nitrided plastic injection mould steel

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