Vacuum carburizing of chromium-nickel steel

Ryzhov, N. M.; Смирнов, А. Е.; Fakhurtdinov, R. S.; Mordovin, A. I.

doi:10.1007/s11041-008-9012-9

Cited by 11 publications

(2 citation statements)

References 2 publications

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“…For each carburization time, there exists a minimum point of carburization weight gain (carburization rate), which can be analyzed in terms of the carburization process. Vacuum high-temperature carburization contains three independent kinetic processes [10]: (1) C transfer from acetylene gas to the inner surface of the furnace tube; (2) C diffuses from the inner surface of the tube to the interior of the alloy; (3) C combines with carbide forming elements Cr and Fe to form carbides inside the alloy. Since the pulsed carburizing method is used in this experiment, carburizing will form a cycle of alternating carburizing and diffusion periods.…”

Section: Discussionmentioning

confidence: 99%

Carburizing Rate of Pyrolysis Furnace Tube in Long-term Service

Du,

Liu,

et al. 2023

J. Phys.: Conf. Ser.

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The high-temperature working environment of ethylene pyrolysis furnace tubes makes carburization one of the main damage mechanisms, and carburization also leads to the degradation of tube material properties and failure. It is important to study the carburization rate of long-term service furnace tubes for the evaluation of long-cycle use and carburization detection. In this paper, the relationship between carburization rate and carburization time is studied by low-pressure vacuum carburization of Cr35Ni45Nb alloy tubes with different service life (new tubes, two years, three years, and six years) in the field, aiming to provide a scientific basis for the remaining life prediction and carburization inspection for the tube material.

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Section: Discussionmentioning

confidence: 99%

Carburizing Rate of Pyrolysis Furnace Tube in Long-term Service

Du,

Liu,

et al. 2023

J. Phys.: Conf. Ser.

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“…Low‐temperature vacuum carburizing performed in an atmosphere of a mixture of acetylene and hydrogen, [ 19,33 ] a mixture of acetylene and nitrogen, [ 20 ] a mixture of acetylene, ethylene and hydrogen, [ 17 ] as well as vacuum oxy‐nitrocarburizing [ 34 ] are widely described in the literature. However, these are different processes than low‐pressure FNC.…”

Section: Introductionmentioning

confidence: 99%

Low‐Pressure Nitrocarburizing in Standard Vacuum Furnaces—Preliminary Studies

Pawęta,

Galeziewska,

Rewers

et al. 2023

Adv Eng Mater

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For the first time, low‐pressure nitrocarburizing process is performed in a minorly modified standard vacuum furnace on 16MnCr5 alloy steel samples. Ammonia and acetylene are used as a source of nitrogen and carbon, respectively. Lowering the pressure of the process ensures longer and more efficient ammonia dissociation. To prove the safety of the process, exhaust gases are investigated online using residual gas analyzer mass spectrometer, whereas reaction products deposited on the sample's surface are studied by means of time‐of‐flight secondary ion mass spectrometer. Possible reactions taking place in the atmosphere of the chamber are written down. In the results of conducted examinations, it is confirmed that no toxic gases are generated, and no cyanides and polycyclic aromatic hydrocarbons are formed during the process. Additionally, microstructure analysis of the cross sections of nitrocarburized sample is performed using scanning electron microscopy (SEM) and optical microscopy. It confirms the diffusion of nitrogen and carbon into the near surface layer. SEM/energy‐dispersive X‐ray spectroscopy analysis demonstrates precipitation of carbide and carbonitride, what is proved by X‐ray diffractometer and microhardness profile analysis. The presented low‐pressure nitrocarburizing results in an increase in hardness from about 200 to over 500 HV and the formation of an effective case depth of about 20 μm, after only 20 min of the process.

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Development of Carburising Towards Agile Production

Wołowiec-Korecka

2024

Physical Chemistry in Action

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Vacuum carburizing of chromium-nickel steel

Cited by 11 publications

References 2 publications

Carburizing Rate of Pyrolysis Furnace Tube in Long-term Service

Carburizing Rate of Pyrolysis Furnace Tube in Long-term Service

Low‐Pressure Nitrocarburizing in Standard Vacuum Furnaces—Preliminary Studies

Development of Carburising Towards Agile Production

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