Laws of formation of diffusion layers and solution of the diffusion problem in temperature-cycle carbonitriding of steel

Семенова, Л. М.; Bakhracheva, Yulia; Semenov, S.

doi:10.1007/s11041-013-9575-y

Cited by 37 publications

(5 citation statements)

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“…In this work, we investigate the influence on the wear resistance temperature and number of cycles on the distribution of carbon and nitrogen through the thickness of the diffusion layer. As well as the formation of structural sites, depending on the carbon content in thermocyclic nitrocementation of steel 20Kh in the range of 900 -600 ˚C [1,2].…”

Section: Methodsmentioning

confidence: 99%

Solution to the Diffusion Problem in the Thermocyclic Nitrocementation of Steel

Bakhracheva

Vasilyev

Petikova

2016

MSF

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It is shown that cyclic heating and cooling considerably accelerate kinetics of process of the steel chemical thermal processing. Laws of formation of the strengthened layers are considered at thermocyclic nitrocementation of the steel 20Kh. Production tests of machine parts after the chemical thermal and chemical-thermocyclic processing were performed. The structure, phase composition and intensity of wear process of a blanket depending on a number of cycles are studied.

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Section: Methodsmentioning

confidence: 99%

Solution to the Diffusion Problem in the Thermocyclic Nitrocementation of Steel

Bakhracheva

Vasilyev

Petikova

2016

MSF

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“…Currently, there is a need to quantify the physical condition of underground pipelines with the aim of preventing accidents and planning of the capital costs of the repair methods is outdated and requires revision [4]. For example [5], guidelines for corrosion testing include: a) a quality assessment of insulation coating of the pipeline at selected points of the network; b) prediction of the corrosion process, etc.…”

Section: Experimental Researchmentioning

confidence: 99%

Accident Prevention and Diagnostics of Underground Pipeline Systems

Trokhimchuk

Bakhracheva

2017

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

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Abstract. Up to forty thousand accidents occur annually with underground pipelines due to corrosion. The comparison of the methods for assessing the quality of anti-corrosion coating is provided. It is proposed to use the device to be tied-in to existing pipeline which has a higher functionality in comparison with other types of the devices due to the possibility of tie-in to the pipelines with different diameters. The existing technologies and applied materials allow us to organize industrial production of the proposed device. IntroductionBy the beginning of 2010, the share of oil pipelines with more than 20 years old was 73 % and more than 30 years -40,6 %. The main reason for failure of oil and gas structures in the corrosion factor. In Russia 40-50% of machines and equipment working in aggressive environments and 30% in slightly aggressive, and only about 10% do not require an active corrosion protection. On the infield pipelines of oil, water and gas 95 percent of the failures falls on in-line inspection and external corrosion [1][2][3].The analysis of statistical data showed that the intensity of accidents on trunk pipelines has a pronounced regional character, i.e. not only the overall performance of scientific and technological progress in the industry, and a number of local factors, features of construction and operation of a specific area, well-developed industrial and transport infrastructure, total economic activity in the region. The main danger emergency depressurization of gas pipelines are:1. Sections of the pipeline after the compressor station (5 km) -due to non-stationary dynamic loads;2. The gas pipeline sections on the connection nodes; 3. Areas near settlements and areas with high levels of anthropogenic activity (construction areas, intersections with roads and railways).The manifestation of accidents on gas pipelines, representing the linear structures has a pronounced territorial character. Regional manifestation of accidents is due to the difference in various regions of the geotechnical characteristics of slopes, condition of the road network, the overall level of industrial and agricultural development. The analysis showed that the corrosion rate North of the 60th parallel in natural soil conditions due to the relatively low temperatures of 15-20 times higher than, for example, in parts of Central Asia. Due to the influence of climatic factors in conjunction with regional characteristics corrosiveness of soils, the failure rate in the Northern zone in 1.4 times, and in the South is 16 times higher than the value for the middle band.

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“…In order to make the hydrophobic iron oxide particles dispersible in water, their surface was modified by a ligand exchange method [28]. As a hydrophilic ligand, mPEG was selected due to its non-toxicity, hydrophilicity and low opsonization in biological media.…”

Section: Coating With Methyl-poly(ethylene Glycol) (Mpeg)mentioning

confidence: 99%