A method for determination of the effective diffusion coefficient and sputtering rate during plasma diffusion treatment

Dimitrov, V. I.; D’Haen, Jan; Knuyt, G.; Quaeyhaegens, C.; Stals, L.M.

doi:10.1016/s0257-8972(97)00530-6

Cited by 28 publications

(7 citation statements)

References 14 publications

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“…Fig. 1 shows that nitriding at lower temperature of 450 o C increases the maximum hardness 1270 H v which is the same as obtained after nitriding at elevated temperatures as shown by others workers [16,17] and also as shown in in the present study at 550 o C.…”

Section: Microhardnss Measurementssupporting

confidence: 90%

Low Temperature Plasma Nitriding of Low Alloy Steel for the Enhancement of Hardness

Rao

Nouveau

Trinadh

2019

Materials Today: Proceedings

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The present concerns surface modification of low alloy CrMoV steel by following the route of plasma nitriding for the improvement of hardness. Plasma nitriding was performed at a low temperature of 450 o C. The maximum hardness at this lower temperature was found to be ~1270 Hv after nitriding. At 550 o C though the hardness improvement near the surface region was similar but the core hardness was reduced. XRD studies revealed various nitrides of iron (γ′ (Fe 4 N) and ε (Fe 2-3 N)) with the ε nitride as the dominant phase. SEM analyses revealed the surface microstructure with almost no white layer. EDS point analyses shown the signature of N on the surface layer. It has been concluded in this study that the hardness of 90CrMoV8 steel can be improved significantly even at a low temperature of 450 o C without any of risk of the loss of core hardness.

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Section: Microhardnss Measurementssupporting

confidence: 90%

Low Temperature Plasma Nitriding of Low Alloy Steel for the Enhancement of Hardness

Rao

Nouveau

Trinadh

2019

Materials Today: Proceedings

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“…However, it is this passive oxide film that could retard or even stop the absorption and diffusion of C or N during thermochemical treatments of these passive alloys. 113 Owing to their beneficial sputtering and depassivation effect together with their environmental friendliness, 114 plasma processes become the first choice for the generation of S N in austenitic stainless steels by PN in the mid-1980s. 8,10,115 Since then, many investigations have been conducted to study various aspects of LTPN of austenitic stainless steels.…”

Section: Plasma Processesmentioning

confidence: 99%

S-phase surface engineering of Fe-Cr, Co-Cr and Ni-Cr alloys

Dong¹

2010

International Materials Reviews

411

239

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Stainless steel, Co-Cr and Ni-Cr alloys have played an important role in many industrial sectors to combat environmental degradation. However, low hardness and poor wear properties have impeded their tribological and tribochemical applications. Conventional thermochemical treatments can be used to significantly harden these passive alloys but at the expense of their corrosion resistance due to precipitation induced depletion of Cr in the matrix. Research in 1980s led to the discovery of a new expanded austenite phase, i.e. so called S-phase with combined improvement in wear and corrosion resistance. Recent research has revealed that S-phase can be formed not only in stainless steels but also in Co-Cr alloys and Ni-Cr alloys. It is the purpose of this paper to critically review the S-phase surface engineering of stainless steels, Co-Cr alloys and Ni-Cr alloys. Particular attention will be paid to the structure, formation conditions, supersaturation, hardening mechanisms and metastability of S-phase. Based on the discussion of the chemical, mechanical, tribological and tribochemical properties of S-phase, the importance of the S-phase surface engineering technology is demonstrated by examples. Finally, future directions towards more stable and thicker S-phase layers will be discussed.

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“…Thus nitriding for 5 h results in a layer of 8.10 mm thinner than that obtained using the cathodic cage technique. For temperatures of 723 K and 873 K the sputtering rate from the sample is 3.0 mm/h [11], so that on nitriding for 5 h the thickness difference is 15.0 mm.…”

Section: Resultsmentioning

confidence: 99%

Nitriding in cathodic cage of stainless steel AISI 316: Influence of sample position

Sousa

Araújo

Costa

et al. 2009

Vacuum

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a b s t r a c tCathodic cage plasma nitriding is a new growth technique based on multiple hollow cathode effects. The samples are kept at a floating potential inside a cage that acts as a cathode and shields the samples from the cathodic potential. The aim of this work is to perform a systematic study of the properties of nitrided layers as a function of the distance from the nitriding sample surface to the cage wall using this technique. Cylindrical austenitic stainless steel AISI 316 samples were placed in different positions on an alumina plate inside the cathodic cage. The nitrided samples were characterized by optical microscopy, X-ray diffraction and microhardness measurements. The results show that the temperature inside the cage is nearly uniform and that the nitrided layers possess good physical properties and uniformity. Therefore, the differences in the nitrided layer thicknesses obtained at different positions must be due to particle flow reaching the sample surface, depending on how far the sample is from the cage walls.

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A method for determination of the effective diffusion coefficient and sputtering rate during plasma diffusion treatment

Cited by 28 publications

References 14 publications

Low Temperature Plasma Nitriding of Low Alloy Steel for the Enhancement of Hardness

Low Temperature Plasma Nitriding of Low Alloy Steel for the Enhancement of Hardness

S-phase surface engineering of Fe-Cr, Co-Cr and Ni-Cr alloys

Nitriding in cathodic cage of stainless steel AISI 316: Influence of sample position

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