The influence of nitrogen implantation on tribological properties of AISI H11 steel

Budzyński, Piotr; Kara, Levent; Küçükömeroğlu, Tevfik; Kamiński, Mariusz

doi:10.1016/j.vacuum.2015.10.002

Cited by 20 publications

(11 citation statements)

References 29 publications

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“…There are many well-known examples of improvement of material properties by application of ion implantation described e.g. in publications [4] and [5]. A great advantage is the negligible effect of ion implantation on the dimensions of the treated element; hence, the process can be applied in the final stage of manufacturing of products that already have their final dimensions [3].…”

Section: Introductionmentioning

confidence: 99%

The influence of nitrogen ion implantation on microhardness of the Stellite 6 alloy

Budzyński

Kamiński

Pałka

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Cobalt alloys known as Stellite used to produce or surfacing machine elements subjected to combustion gases and heat. They are used a currently in the manufacture of valves and valve seats in internal combustion engines. Because of the small thermal conductivity, stellite may not be subjected heat treatment. In order to improve the mechanical properties of cobalt alloys, samples were implanted with nitrogen ions with 65 keV energy and ion dose IntroductionCurrent internal combustion engines competing with electric motors must be characterised by high efficiency and performance. Manufacturers strive to reduce engine displacement in order to lower the weight of the engine, simultaneously increasing their generated power. This necessitates application of light and extremely durable materials for construction of engines. The efficiency of internal combustion engines depends on their capability to generate and maintain high pressure in the combustion chamber.Besides the piston-ring-cylinder system, valves and valve seats are largely responsible for the tightness of the combustion chamber. They are elements of the valve timing in four-stroke engines designed to facilitate supply of fresh air or the air-fuel mixture to the cylinder; next, they have to ensure tightness during compression and combustion of the load and facilitate removal of exhaust gas from the cylinder [12]. Valves and valve seats are exposed to direct contact with high temperature while sealing the combustion chamber and fuel flow around the valves and valve seats in the exhaust stroke, in particular in the case of exhaust valves [9]. This results inconsiderable thermal loads during heat exhaust through the valves and valve seats into the cylinder head. Also, the work of the valves causes high mechanical loads associated with the impact of the surface of the valve heads against the surface of valve seats.

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Section: Introductionmentioning

confidence: 99%

The influence of nitrogen ion implantation on microhardness of the Stellite 6 alloy

Budzyński

Kamiński

Pałka

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The long-rage effect in the Ti6Al4V alloy sample implanted with nitrogen ions with an energy of 120 keV and a fluence of 5 × 10 17 N + /cm 2 extends to a depth of 2.9(1) µm. This method was first employed to investigate two steel grades: AISI 316L [7] and AISI H11 [8].…”

Section: Experimental Details and Discussionmentioning

confidence: 99%

Long-Range Effect of Ion-Implanted Materials in Tribological Investigations

et al. 2019

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Microhardness results and the occurrence of radiation defects at a greater depth than the predicted implanted ion range indicate the presence of the so-called long-range effect. An attempt is made to determine the thickness of a layer with modified tribological properties by measuring friction and wear factors. Tribological tests are performed on the pin-on-disc stand. The real thickness of a layer with implantation-modified tribological properties can be determined via tribological testing by measuring the wear trace depth when the friction factor and/or wear of the implanted sample is close to that characteristic of an unimplanted sample. The predicted range of the implanted ions is estimated by the SRIM and SATVAL programs. The presence of the long-range effect is confirmed for the steel grades AISI 316L, H11, Raex 400, Hardox 450 as well as for the Stellite 6 and Ti6Al4V alloys. The modified layer thickness determined by tribological testing is considerably greater (4.7 ÷ 16.7 times) than the initial range of the implanted nitrogen ions. The observed depth of changes in the tribological properties of the surface layer (due to the long-range effect) is consistent with the nanohardness results obtained for the steel grades AISI 316 and H11. An analysis of the content of elements on the sample surface as well as in its wear trace and wear products is performed by X-ray spectroscopy (EDS and WDXS). The results demonstrate that one of the causes of the long-range effect is the diffusion of nitrogen and carbon atoms in the friction zone during the tribological test.

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“…There are investigations aimed at improvement thereof and expansion of their applications [2]. Nitrogen implantation is used for improvement of the mechanical properties of steel [3][4][5][6], aluminium [7], Ti6Al4V alloy [8] etc. Nitrogen implantation is also applied for improvement of the mechanical properties of sensitive elements in mechanical structures.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of the Stellite 6 Cobalt Alloy Implanted with Nitrogen Ions

et al. 2017

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The effect of nitrogen ion implantation on Stellite 6 cobalt alloy was investigated. In this research, cobalt alloy was implanted with 65 keV nitrogen ions at the fluence of (1 ÷ 10) × 10 16 N + /cm 2 . The distribution of implanted nitrogen ions and vacancies produced by them was calculated using the SRIM program. The surface morphology was examined and the elemental analysis was performed using scanning electron microscopy, energy dispersive X-ray spectroscopy and grazing incidence X-ray diffraction. The wear tests were conducted with the use of the pin-on-disc method. The results demonstrate that implantation with nitrogen ions significantly reduces the friction factor and wear. The friction coefficient of the implanted sample at the fluence of 1 × 10 17 N + /cm 2 increased to the values characteristic of an unimplanted sample after 5000 measurement cycles. The depth of the worn trace was about 2.0 µm. This implies that the thickness of the layer modified by the implantation process is ≈ 2.0 µm and exceeds the initial range of the implanted ions by an order of magnitude. This is referred to as a long-range implantation effect. The investigations have shown that the long-range effect is caused by movement of not only implanted nitrogen atoms but also carbon dopant atoms towards the friction zone. Diffusion of carbon atoms has been documented here for the first time. Furthermore, the increased content of oxygen atoms on the track bottom indicates a dominant oxidative wear of the Stellite samples after nitrogen implantation with the energy 65 keV and the fluences of 5 × 10 16 and 10

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The influence of nitrogen implantation on tribological properties of AISI H11 steel

Cited by 20 publications

References 29 publications

The influence of nitrogen ion implantation on microhardness of the Stellite 6 alloy

The influence of nitrogen ion implantation on microhardness of the Stellite 6 alloy

Long-Range Effect of Ion-Implanted Materials in Tribological Investigations

Mechanical Properties of the Stellite 6 Cobalt Alloy Implanted with Nitrogen Ions

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