EP2773789B1 - Karbonitrierungsverfahren mit einem abschliessenden nitrierungsschritt während eines temperaturabfalls - Google Patents

Karbonitrierungsverfahren mit einem abschliessenden nitrierungsschritt während eines temperaturabfalls Download PDF

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Publication number
EP2773789B1
EP2773789B1 EP12772768.3A EP12772768A EP2773789B1 EP 2773789 B1 EP2773789 B1 EP 2773789B1 EP 12772768 A EP12772768 A EP 12772768A EP 2773789 B1 EP2773789 B1 EP 2773789B1
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European Patent Office
Prior art keywords
temperature
phase
nitriding
initial
nitridation
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English (en)
French (fr)
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EP2773789A1 (de
Inventor
Philippe Lapierre
Jérôme LARDINOIS
Yves Giraud
Alfred RALLO
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ECM Technologies SAS
PSA Automobiles SA
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ECM Technologies SAS
PSA Automobiles SA
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/02—Pretreatment of the material to be coated
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/34—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in more than one step
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/80—After-treatment

Definitions

  • the present invention relates to a process for carbonitriding steel parts, including, but not limited to, parts used in the manufacture of motor vehicles.
  • the invention also applies to parts used in the manufacture of agricultural machinery, machine tool, or parts in the aeronautical field.
  • the object of the invention is to improve the process of the aforementioned document, that is to say to improve the quality of the parts obtained, preferably with a reduction of the treatment time.
  • the final nitriding step comprises a temperature step.
  • the last nitriding step is thus carried out under optimal conditions.
  • the temperature rise is carried out with a reduced temperature gradient compared to the simple temperature rise phase.
  • the nitrogen enrichment which is carried out under favorable conditions for good nitriding is increased so that it is possible to shorten or eliminate one of the subsequent nitriding steps and thus reduce the total treatment time.
  • the method according to the invention comprises a first step of temperature rise comprising a first phase M of simple temperature rise, illustrated by a line in continuous line, from the ambient temperature to a point at a temperature of 700 ° C. , denoted Ni1 in the figure.
  • the phase simple rise in temperature can be carried out up to a temperature of between 700 ° C. and 750 ° C., and has a duration of between 10 min and 90 min, that is to say that the simple rise in temperature is carried out with a temperature gradient of between 8 ° C / min and 75 ° C / min.
  • the process then comprises an initial nitriding phase Ni with continuation of the temperature rise step up to a temperature of 940 ° C. in the example illustrated.
  • the temperature of 940 ° C corresponds to a compromise between a temperature of 860 ° C which allows a treatment of better quality and a temperature of 1000 ° C which allows for faster processing.
  • the rise in temperature continues on a regular basis but with a temperature gradient of between 3.5 ° C./min and 16 ° C./min less than the temperature gradient during the simple temperature rise.
  • the duration of the initial nitriding phase is between 15 minutes and 45 minutes, depending on the amount of nitrogen that it is desired to set in this initial step and the composition of the steel to be treated.
  • the initial nitriding phase comprises injection phases of a nitriding gas such as alternating ammonia with diffusion phases.
  • the rise in temperature continues with the same temperature gradient as during the simple rise in temperature to a point at a temperature between 750 ° C and 850 ° C, here 800 ° C, denoted Ni2 in the figure.
  • the temperature is then maintained according to a plateau until a moment noted Ni3 on the figure 2 from which a high temperature rise is performed to reach the carburizing temperature.
  • the temperature of the bearing is chosen in a manner known per se to perform the initial nitriding phase under optimal conditions given the composition of the parts to be treated. Note in this connection that because of the bearing, the final temperature rise can be performed very rapidly, for example 80 ° C / min at 100 ° C / min without subjecting the parts to unacceptable constraints.
  • the rise in temperature continues from point Ni1 with a lower temperature gradient than in the first embodiment, preferably in a range of 2 ° C / min to 8 ° C / min, up to Ni4 moment, corresponding here to a temperature of 850 ° C, from which a high temperature rise is performed to reach the carburizing temperature, according to a gradient similar to that of the second embodiment.
  • the process then comprises n alternating cementation phases with nitriding phases.
  • the carburizing and nitriding steps comprise alternating treatment gas injection phases with diffusion phases not shown in the figures.
  • the diagram has been interrupted between the nitriding step N1 and the last cementation step Cn.
  • the process comprises a final nitriding step Nn accompanied by a descent of temperature immediately before T quenching.
  • the temperature is lowered continuously to a temperature within the optimum temperature range for all nitriding. remaining high enough to allow efficient quenching.
  • the final temperature before quenching is 840 ° C.
  • this limited descent of temperature decreases the stress on the parts during quenching.
  • the final nitriding step has a duration of preferably between 15 min and 60 min, which corresponds to a temperature gradient of between 10 ° C / min and 1 ° C / min.
  • the final nitriding step preferably comprises alternating nitriding gas injection phases with diffusion phases.
  • the descent of temperature is first of all carried out in a strong way, with a gradient as strong as possible without generating undue stresses in the steel, up to the optimum nitriding temperature for the steel being treated, noted Nn1 in the figure, here 840 ° C, then the temperature is maintained at a plateau until the beginning of quenching.
  • the method according to the invention can be implemented by combining any one of the embodiments of the initial nitriding phase with any of the embodiments of the final nitriding phase.
  • the initial rise in temperature can be carried out according to a constant gradient as illustrated by a dashed line in the figure.
  • the initial rise in temperature can be carried out according to a constant gradient as illustrated by a dashed line in the figure.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (6)

  1. Karbonitrierungsverfahren von Stahlteilen, insbesondere von Teilen, die für die Herstellung von Kraftfahrzeugen verwendet werden, aufweisend abwechselnde Schritte einer Aufkohlung (C1-Cn) und einer Nitrierung (N1-Nn-1) bei konstanter Temperatur, denen ein Schritt eines Temperaturanstiegs vorausgeht, und gefolgt von einem Schritt eines Härtens (T), dadurch gekennzeichnet, dass es einen abschließenden Nitrierungsschritt (Nn) aufweist, der von einem Temperaturabfall unmittelbar vor dem Härten (T) begleitet wird, dadurch, dass der Temperaturabfall bis zu einer Temperatur von zwischen 900 °C und 800 °C ausgeführt wird, dadurch, dass der Temperaturabfall mit einem Temperaturgradienten von zwischen 10 °C/min und 1 °C/min ausgeführt wird und dadurch, dass der Schritt des Temperaturanstiegs eine Phase eines einfachen Temperaturanstiegs (M) umfasst, gefolgt von einer anfänglichen Nitrierungsphase (Ni) unter Fortsetzung des Temperaturanstiegs, und die anfängliche Nitrierungsphase (Ni) ab einer Temperatur von zwischen 700 °C und 750 °C und bis zu einer Temperatur von zwischen 860 °C und 1000 °C durchgeführt wird.
  2. Karbonitrierungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass der abschließende Nitrierungsschritt eine Temperaturstufe (Nn2) aufweist.
  3. Karbonitrierungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass während der anfänglichen Nitrierungsphase (N1) der Temperaturanstieg mit einem in Bezug auf die Phase des einfachen Temperaturanstiegs (M) verringerten Temperaturgradienten ausgeführt wird.
  4. Karbonitrierungsverfahren nach Anspruch 3, dadurch gekennzeichnet, dass die anfängliche Nitrierungsphase (Ni) eine Temperaturstufe (Ni2-Ni3) aufweist.
  5. Karbonitrierungsverfahren nach Anspruch 3, dadurch gekennzeichnet, dass die anfängliche Nitrierungsphase (N1) unmittelbar von einem ersten Schritt einer Aufkohlung (C1) gefolgt wird.
  6. Karbonitrierungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass die anfängliche Nitrierungsphase (N1) mit einem Temperaturgradienten von zwischen 3,5 °C/min und 10 °C/min ausgeführt wird.
EP12772768.3A 2011-10-31 2012-10-08 Karbonitrierungsverfahren mit einem abschliessenden nitrierungsschritt während eines temperaturabfalls Active EP2773789B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1159878A FR2981949B1 (fr) 2011-10-31 2011-10-31 Procede de carbonitruration a etape de nitruration finale pendant une descente de temperature
PCT/EP2012/069890 WO2013064337A1 (fr) 2011-10-31 2012-10-08 Procede de carbonitruration a etape de nitruration finale pendant une descente de temperature

Publications (2)

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EP2773789A1 EP2773789A1 (de) 2014-09-10
EP2773789B1 true EP2773789B1 (de) 2019-02-20

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US (1) US9938615B2 (de)
EP (1) EP2773789B1 (de)
JP (1) JP6138810B2 (de)
KR (1) KR101945005B1 (de)
CN (1) CN103958720B (de)
BR (1) BR112014010316A2 (de)
FR (1) FR2981949B1 (de)
IN (1) IN2014CN03955A (de)
MX (1) MX357137B (de)
WO (1) WO2013064337A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3028530B1 (fr) * 2014-11-14 2020-10-23 Peugeot Citroen Automobiles Sa Procede et installation de carbonitruration de piece(s) en acier sous basse pression et haute temperature
KR20220074308A (ko) 2020-11-27 2022-06-03 시흥시 연자육 차 제조방법

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1454998A1 (de) * 2001-12-13 2004-09-08 Koyo Thermo Systems Co., Ltd. Vakuum-carbonitrierverfahren

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1159878A (fr) 1956-10-17 1958-07-03 Treuil destiné particulièrement à être monté sur un véhicule automobile
US5273585A (en) * 1990-03-27 1993-12-28 Mazda Motor Corporation Heat-treating apparatus
JP2006002194A (ja) * 2004-06-16 2006-01-05 Nsk Ltd 軸の製造方法
JP4655528B2 (ja) * 2004-07-12 2011-03-23 日産自動車株式会社 高強度機械構造用部品の製造方法、および高強度機械構造用部品
FR2884523B1 (fr) * 2005-04-19 2008-01-11 Const Mecaniques Sa Et Procede et four de carbonitruration a basse pression
DE102010028165A1 (de) * 2010-04-23 2011-10-27 Robert Bosch Gmbh Verfahren zur Carbonitrierung von metallischen Bauteilen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1454998A1 (de) * 2001-12-13 2004-09-08 Koyo Thermo Systems Co., Ltd. Vakuum-carbonitrierverfahren

Also Published As

Publication number Publication date
IN2014CN03955A (de) 2015-10-23
EP2773789A1 (de) 2014-09-10
JP2014532810A (ja) 2014-12-08
JP6138810B2 (ja) 2017-05-31
MX357137B (es) 2018-06-27
KR20140101750A (ko) 2014-08-20
US20140290800A1 (en) 2014-10-02
MX2014005221A (es) 2015-03-09
US9938615B2 (en) 2018-04-10
KR101945005B1 (ko) 2019-02-01
BR112014010316A2 (pt) 2017-05-02
FR2981949A1 (fr) 2013-05-03
WO2013064337A1 (fr) 2013-05-10
FR2981949B1 (fr) 2013-11-08
CN103958720A (zh) 2014-07-30
CN103958720B (zh) 2016-05-18

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