Studies of the mechanism of metal dusting of 10CrMo9-10 steel after 10 years of operation in the semi-regenerative catalytic reformer

Szkodo, Marek; Gajowiec, Grzegorz

doi:10.1016/j.corsci.2015.10.016

Cited by 10 publications

(5 citation statements)

References 37 publications

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“…induction period, IP), at which the observed weight gain does not exceed 100%. Appearance of IP is related to the first stage of the metal dusting process, when the carbon transfer to the alloy's surface, its diffusion into the bulk and subsequent nucleation of the graphite phase commonly take place [16, 31, 32]. It can be also seen that the content of Mo in the Ni-Mo alloy exerts significant influence upon the duration of observed IP (Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of Mo on the catalytic activity of Ni-based self-organizing catalysts for processing of dichloroethane into segmented carbon nanomaterials

Bauman

Rudneva

Mishakov

et al. 2019

Heliyon

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A series of micro-disperse Ni-Mo alloys with the sponge-like structure was prepared by a simultaneous precipitation method followed by sintering of the sediment in H2 atmosphere at 800 °C. According to XRD data, the formation of single-phase solid solution Ni1-xMox took place for the samples with Mo content of 0.6–8.3 wt.%. Synthesized samples were studied in a process of the catalytic CVD of C2H4Cl2 at 550–700 °C. In situ kinetic studies of carbon deposition process were carried out in a flow gravimetric setup equipped with McBain balances. An interaction of Ni-Mo alloys with C2H4Cl2 is accompanied by their rapid disintegration with formation of disperse active particles catalyzing the growth of carbon nanomaterials (CNM). The strong boosting effect of Mo on the catalytic performance of Ni was revealed. The maximum yield of CNM product (8.3 wt.% Mo, 600 °C, 120 min) was as high as 45 g/gM. The study on effect of the reaction temperature on the CNM yield allowed one to define an optimal temperature regime. The impact of Mo concentration upon the morphology, structural features and textural properties of the produced carbon fibers was investigated by means of SEM, TEM, Raman spectroscopy and low-temperature nitrogen adsorption. The role of chemisorbed chlorine species in a pulse-to-pulse regime of the segmented carbon filaments formation was discussed.

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Section: Resultsmentioning

confidence: 99%

Effect of Mo on the catalytic activity of Ni-based self-organizing catalysts for processing of dichloroethane into segmented carbon nanomaterials

Bauman

Rudneva

Mishakov

et al. 2019

Heliyon

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“…This shows segregation of Mo in the WC, which leads to the development of M 6 C 35 and M 3 C (Fe 2 MoC) precipitates. 36 In the case of PCGTA welding, the segregation is also observed but very less compared to GTA. But, in the case of the WI region, such segregation was not noticed.…”

Section: Resultsmentioning

confidence: 98%

“…Figures 8 and 9(i) to (iv) display the EDS images of GTA and PCGTA technique. It is seen from the GTA welding that the interdendritic zone of the WC is 36 In the case of PCGTA welding, the segregation is also observed but very less compared to GTA. But, in the case of the WI region, such segregation was not noticed.…”

Section: Sem/eds Observationmentioning

confidence: 87%

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Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade Alloy X

Munusamy

Manikandan

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Alloy X is prone to liquation and solidification cracks in the weldments, because of the development of topologically close-packed precipitates such as σ, P, M6C, and M23C6 carbides during arc welding methods. The present work examines the possibility of alleviating the segregation of Cr and Mo content to eliminate the development of topologically close-packed phases using a conventional arc welding technique. The welding of Alloy X has been achieved with ERNiCrMo-2 filler material by gas tungsten arc welding and pulsed current gas tungsten arc welding technique. The optical microscope shows the refined microstructure in pulsed current gas tungsten arc with respect to gas tungsten arc welding. The Mo-rich segregation was identified in gas tungsten arc weldment, and the same was absent in pulsed current gas tungsten arc. These segregations of Mo-rich content encourage the development of M3C and M6C secondary precipitates in gas tungsten arc welding. Pulsed current gas tungsten arc welding shows the existence of NiCrCoMo precipitate. The present work confirmed the absence of P, σ, and M23C6 in both the weldments of Alloy X. The ultimate tensile strength, microhardness, and impact strength of pulsed current gas tungsten arc welding are increased by 3.39, 9.17, and 21.62%, respectively, with gas tungsten arc welding. The observed Mo-rich M3C and M6C secondary phases in the gas tungsten arc welding affect the tensile strength of the weldments.

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“…The alumina film in oxidation reactions is used as support because it provides high surface areas and favours the catalyst dispersion [28][29][30], being also extremely effective as a barrier against the oxidative atmosphere. The alumina film should be sufficiently dense and thin to avoid carbon diffusion and, at the same time, the inconvenient of its rupture by the difference of the coefficients of expansion.…”

Section: Deposition Of Alumina In Microchannelsmentioning

confidence: 99%

Thermal treatment and deposition of alumina in metallic microchannels

Duran

Belzunce

Cadús

2019

Surface Engineering

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The objective of this work is the generation of a suitable surface, in microchannels of AISI 304 stainless steel for the manufacture of a microreactor, which ensures the anchoring of the active phase. The novelty of the work lies in achieving stabilization layer to work in different environments. The roughness generation was carried out by thermal treatment and passivation via alumina deposition by the impregnation method. The characterization was made with SEM-EDX and confocal microscope images. In a humid atmosphere, the generated surface showed high roughness with the presence of multiple filaments of iron oxide. Dilution of the suspension favoured the stability of the formed film.

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Studies of the mechanism of metal dusting of 10CrMo9-10 steel after 10 years of operation in the semi-regenerative catalytic reformer

Cited by 10 publications

References 37 publications

Effect of Mo on the catalytic activity of Ni-based self-organizing catalysts for processing of dichloroethane into segmented carbon nanomaterials

Effect of Mo on the catalytic activity of Ni-based self-organizing catalysts for processing of dichloroethane into segmented carbon nanomaterials

Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade Alloy X

Thermal treatment and deposition of alumina in metallic microchannels

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