Tribological properties of plasma-nitrided AISI 4340 steel in vacuum

Zhong, Hua; Dai, Lei; Yue, Yunlong; Wang, B.; Zhang, X.; Tan, Chen; Ma, Mengdong; Liu, R.

doi:10.1080/02670836.2015.1121341

Cited by 11 publications

(8 citation statements)

References 35 publications

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“…As was reported that there exists a critical nitrogen potential, i.e. the lowest nitrogen potential for controlling the formation of a compound layer, in other words, the compound layer can not be formed when the nitrogen potential is lower than the critical value [13][14][15] . Since in real applications there is no efficient way to evaluate the nitrogen potential of plasma nitriding, nitrogen hydrogen ratio is used to represent nitrogen potential in this study, and it is found that the critical nitrogen hydrogen ratio to control the formation of compound layer is 1:5 for 38CrMoAl steel at 540℃.Therefore, the results can provide valuable guide for designing plasma nitriding process in real applications.…”

Section: Results and Discussion 31 Microstructure Characterizationmentioning

confidence: 99%

“…Hence, it is of significant value to control the formation of compound layer during plasma nitriding for highpressure valve. It has been reported that compound layer can be avoided through low temperature plasma nitriding [13][14][15]. However, the combined properties of the nitriding layer obtained by low temperature plasma nitriding can't meet the advanced technical specifications in some real applications, such as surface hardness and wear resistance.…”

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confidence: 99%

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EFFECT OF NITROGEN HYDROGEN RATIO ON PLASMA NITRIDING FOR 38CrMoAl

Song

Peng

Zhao

et al. 2018

Acta Metall Slovaca

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Critical nitrogen hydrogen ratio in plasma nitriding was primarily investigated to get enhanced performance for 38CrMoAl steel. The modified surface layer was characterized by optical microscopy (OM), X-ray diffraction (XRD) and micro-hardness tester. The results showed that the critical nitrogen hydrogen ratio was 1: 5 while plasma nitriding at 540℃ for 6 h. Under this condition, no compound layer was formed, and accompanied with high surface hardness, while the compound layer was formed accompanied with lower surface hardness with nitrogen hydrogen ratio higher than the critical value.

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Section: Results and Discussion 31 Microstructure Characterizationmentioning

confidence: 99%

mentioning

confidence: 99%

EFFECT OF NITROGEN HYDROGEN RATIO ON PLASMA NITRIDING FOR 38CrMoAl

Song

Peng

Zhao

et al. 2018

Acta Metall Slovaca

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“…14,15 Addition of TiC particles to the wear surface dramatically reduced the wear rate against an alumina ball, 12 and as with 7 oxide generation at the surface played a key role. Ma et al 13 conduct ball-on-disc tests in vacuum on a nitrided low alloy steel, finding different wear modes at different speeds. Tian et al…”

Section: A a Howementioning

confidence: 99%

“…Amongst the papers addressing surface modification of the steel, we have the embedding of TiC particles, 12 plasma nitriding, 13 and improving the overall wear resistance through irregularities in shape and composition of the steel surface. 14,15 Addition of TiC particles to the wear surface dramatically reduced the wear rate against an alumina ball, 12 and as with 7 oxide generation at the surface played a key role.…”

Section: A a Howementioning

confidence: 99%

Wear resistant steels

Howe¹

2016

Materials Science and Technology

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Everyone knows, approximately, what wear is; however, wear is not an exact science. 1 Its minimisation in innumerable industrial operations and products would present substantial economic benefits. A useful, general definition is the progressive loss of material from the surface of a solid body due to mechanical action, i.e. the contact and relative motion against a solid, liquid or gaseous counterbody. 2 Various modes of wear have been defined 2,3 : adhesive, abrasive, surface fatigue and tribochemical reaction, each with its own sub-divisions, whilst noting that they often occur in combination. Other authors have added extra sub-divisions, or even extra categories which it could be argued are cases (albeit conveniently) combining elements of the existing definitions. A whole paper could be spent, or maybe wasted, trying to define and argue these, but that is not the purpose here. Suffice it to say that wear is a property: 'characteristic of the engineering system', 3 rather than purely a material property, which itself raises significant issues as to how to measure it most relevantly for the application in question. 2,4 Hardness has long been known as a key material property for wear resistance, but by no means a sufficient one, 5 but which is often achieved with a reduction in other desirable properties, notably ductility. Although wear is a mature subject and steel a mature material, both continue to benefit from further understanding and development, with major economic implications.The declared target for the contributions to this thematic issue was new steel developments from the laboratory stage up to and including trial applications, and the state of current research on the material aspects of obtaining good wear resistance in combination with improvement of other mechanical properties. Surface treatment of the steel was within scope but not coatings as such.Clearly, this target could not be met exhaustively for such a wide, active and important field. However, interesting contributions were received on a range of different aspects.

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“…Therefore, the understanding of the friction and wear mechanisms is of great significance on the improvement of reliability and stability of bearings. [13][14][15][16][17][18][19][20][21] In harsh conditions, a conventional lubrication of moving parts is difficult. These moving parts typically operate under dry conditions such as in dust and sand.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Friction and Wear Properties of High-Temperature Bearing Steel 9Cr18Mo

Qu³

et al. 2018

Mat. Res.

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This paper presented a study of friction and wear on 9Cr18Mo when rubbed against other materials (steel-304, steel-440C, steel-GCr15 or silicon nitride ceramic ball) at high temperature conditions. Friction and wear tests were carried out with universal a friction and wear testing machine. The wear morphology was analyzed by a Nanovea three-dimensional profilometer and trinocular positive Gang metallurgical microscope. The Vickers hardness of 9Cr18Mo at different temperatures was tested by means of a high temperature vacuum hardometer. Results showed that the friction and wear on the contact surface of the 9Cr18Mo sample are higher when the hardness of counter materials is higher than or similar to that of the sample. Under dry sliding conditions, the 9Cr18Mo sample surface presented various degrees of adhesion, plowing and pit, particularly if tested in the presence of a high temperature environment. During the worn stages, the counter materials on the worn surface successively produced cracks, crack growth, and wear debris under the action of load. Moreover, the frictional pair 9Cr18Mo-ceramic showed good anti-wear behavior at 400 °C that proved the anti high temperature performance of 9Cr18Mo.

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Tribological properties of plasma-nitrided AISI 4340 steel in vacuum

Cited by 11 publications

References 35 publications

EFFECT OF NITROGEN HYDROGEN RATIO ON PLASMA NITRIDING FOR 38CrMoAl

EFFECT OF NITROGEN HYDROGEN RATIO ON PLASMA NITRIDING FOR 38CrMoAl

Wear resistant steels

Investigation on Friction and Wear Properties of High-Temperature Bearing Steel 9Cr18Mo

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