New developments in thermo-chemical diffusion processes

Gräfen, W.; Edenhofer, B.

doi:10.1016/j.surfcoat.2005.08.107

Cited by 55 publications

(21 citation statements)

References 9 publications

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“…They are currently implemented in specialized furnaces or universal ones, making possible, depending on the type, the cooling of components (including quenching) in oil baths or in a stream of gas under high pressure -usually nitrogen [1][2][3][4][5][6]. Both carburizing and nitriding are currently realized in a controlled manner that allows, using computer-aided design processes, accurate control of the morphology of the surface layer [2,3,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Nitriding can be applied for various types of steel and cast irons and in case of gears of small module pitch. Carburizing finds a very wide application in case of gears and toothed elements [1,3,5,9]. Vacuum carburizing process is better than conventional carburizing due to its efficiency; it also has certain other advantages, such as: no internal oxidation, higher uniformity of the carburizing layers produced in the process, energy efficiency and environmental friendliness [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of the Quenching Method on the Deformations Size of Gear Wheels after Vacuum Carburizing

Dybowski¹,

Sawicki²,

Kula³

et al. 2016

Archives of Metallurgy and Materials

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This paper presents a comparison of the deformations and residual stresses in gear wheels after vacuum carburizing process with quenching in high-pressure nitrogen and oil. The comparison was made on a medium-sized gear wheels, made of AMS6265 (AISI 9310) steel. This steel is applied in the aerospace industry for gears. The study has provided grounds for an assessment of the effect of the method of quenching on the size of deformations. Compared to oil quenching, high-pressure gas quenching following vacuum carburizing resulted in more uniform and smaller deformations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of the Quenching Method on the Deformations Size of Gear Wheels after Vacuum Carburizing

Dybowski¹,

Sawicki²,

Kula³

et al. 2016

Archives of Metallurgy and Materials

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“…W chwili obecnej dwa rozwiązania innowacyjne w tym zakresie stanowią niewątpliwie rewolucję technologiczną na wielką skalę. Są to: nawęglanie próż-niowe w kompaktowym rozwiązaniu polegającym na hartowaniu w gazach obojętnych (azocie lub helu) pod wysokim ciśnieniem [13][14][15][16][17][18] oraz wprowadzenie do szlifowania ściernic nowej generacji -z ziarnami z regularnego azotku boru wraz z zastosowaniem różnych cieczy obróbkowych [7][8][9][10][11][12]. Powszechnie znanych jest szereg aplikacji przemysłowych obu tych nowych rozwiązań oraz problemy, które wyniknęły przy ich wdrażaniu i upowszechnianiu.…”

Section: Abstract: Synergy Residual Stresses Vacuum Carburizing Grunclassified

The influence of modern thermo-chemical and abrasive treatments on the distribution of residual stresses in the surface layer of 17CrNi6-6 steel

Kruszyński¹,

Sawicki²,

Wójcik³

2015

Mechanik

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W niniejszej pracy przedstawiono wyniki badań dotyczące określenia stanu naprężeń własnych powstałych w wyniku kształtowania warstwy wierzchniej materiału poprzez obróbkę nawęglania próżniowego i szlifowania. Synergiczny wpływ obróbki cieplno-chemicznej i ściernej badano na próbkach pierścieniowych wykorzystywanych do badań naprężeń własnych metodą Dawidenkowa. Próbki poddano procesowi nawęglania próżniowego i następnie szlifowano ściernicą elektrokorundową -38A60K8V oraz ściernicą z ziarnami CBN -RNB80/63B75V. Podczas szlifowania stosowano ciecze obróbkowe: emulsja olejowa 5%, wydatek ok. 20 l/min, olej Micro5000 podawany z minimalnym wydatkiem (MQL) ok. 25 ml/h, obróbka na sucho. Na podstawie przeprowadzonych badań określono wpływ rodzaju ściernicy oraz czynnika chłodząco-smarującego na rozkład naprężeń własnych w warstwie wierzchniej. Najlepsze efekty szlifowania, w odniesieniu do rozkładu naprężeń wła-snych, uzyskano przy podawaniu cieczy obróbkowej (emulsji olejowej) w trybie obfitym podczas szlifowania ściernicą z ziarnami CBN.SŁOWA KLUCZOWE: synergizm, naprężenia własne, nawęglanie próżniowe, szlifowanieIn this paper we present research concerning the determination of the stresses resulting from forming the material surface layer by vacuum carburizing and grinding. The synergistic effect of thermo-chemical and abrasive treatments was studied on ring samples used for Dawidenkow stress calculation method. The samples were subjected to vacuum carburizing and then grinded using aloxite grinding wheel -38A60K8V and CBN-RNB80/63B75V. When grinding, apart from dry machining, selected cutting fluids were used: 5% oil emulsion with quantity lubrication approx. 20 l/min, oil Micro5000 administered with a minimum quantity lubrication (MQL) approx. 25 ml/h. Based on the study, the effect of grinding-cooling lubricant type on the stresses distribution in the surface layer was defined. Optimum results with respect to the distribution of stresses were achieved for the abrasive treatment in fluid (oil emulsion) under rich lubrication regime using CBN grinding wheel. KEYWORDS: synergy, residual stresses, vacuum carburizing, grindingWprowadzenie Dotychczas problem kształtowania stanu naprężeń wła-snych w procesach utwardzania powierzchniowego na drodze obróbki cieplnej i cieplno-chemicznej [1-6] i ich superpozycji z naprężeniami od zewnętrznych obciążeń eksploatacyjnych [2,7,8]

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“…At present, vacuum carburisation technology is replacing the older technologies and is more and more widely used, especially in the automotive industry, and most recently it has been applied in the aerospace industry. This stems from a number of advantages that the technology offers; these include the possibility to shorten the carburising time by raising the process temperature, the possibility to use significantly higher carbon potentials for the atmosphere, the elimination of internal oxidisation, clean charge surface after the process, and the reduction of environmentally noxious emissions [1][2][3][4]. An important step in the development of this technology is the FineCarb ® expert system used for designing vacuum carburised layers which enables selecting optimum process parameters depending on the required hardness distribution in the surface of the treated parts.…”

Section: Introductionmentioning

confidence: 99%

PROPERTIES OF CASES TREATED BY USING NEW HIGHTEMPERATURE VACUUM CARBURISATION TECHNOLOGY WITH THE PRE-NITRIDING – PRENiTLPC OPTION

Kula¹,

Dybowski²,

Pietrasik³

et al. 2018

ABM Proceedings

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Vacuum carburising with pre-nitriding (PreNitLPC ® technology) involves feeding ammonia during the charge heating stage before carburising. The purpose is to restrict the growth of grain in the surface layer of the carburised steel. The article presents the influence of nitrogen on restricting austenite grain growth during vacuum carburising and on mechanical properties (fatigue strength, impact resistance) of layers that underwent such treatment in comparison with traditional carburising methods.

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New developments in thermo-chemical diffusion processes

Cited by 55 publications

References 9 publications

The Effect of the Quenching Method on the Deformations Size of Gear Wheels after Vacuum Carburizing

The Effect of the Quenching Method on the Deformations Size of Gear Wheels after Vacuum Carburizing

The influence of modern thermo-chemical and abrasive treatments on the distribution of residual stresses in the surface layer of 17CrNi6-6 steel

PROPERTIES OF CASES TREATED BY USING NEW HIGHTEMPERATURE VACUUM CARBURISATION TECHNOLOGY WITH THE PRE-NITRIDING – PRENiTLPC OPTION

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