EP0545069B1 - Procédé de traitement d'aciers et de métaux réfractaires - Google Patents

Procédé de traitement d'aciers et de métaux réfractaires Download PDF

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Publication number
EP0545069B1
EP0545069B1 EP92118403A EP92118403A EP0545069B1 EP 0545069 B1 EP0545069 B1 EP 0545069B1 EP 92118403 A EP92118403 A EP 92118403A EP 92118403 A EP92118403 A EP 92118403A EP 0545069 B1 EP0545069 B1 EP 0545069B1
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EP
European Patent Office
Prior art keywords
temperature
oxidation
pressure
thermochemical
steels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92118403A
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German (de)
English (en)
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EP0545069A1 (fr
Inventor
Albrecht Dr. Melber
Peter Dr. Minarski
Friedrich Dr. Preisser
Klaus Dr. Zimmermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leybold Durferrit GmbH
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Leybold Durferrit GmbH
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Publication date
Priority claimed from DE4139975A external-priority patent/DE4139975C2/de
Application filed by Leybold Durferrit GmbH filed Critical Leybold Durferrit GmbH
Publication of EP0545069A1 publication Critical patent/EP0545069A1/fr
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Publication of EP0545069B1 publication Critical patent/EP0545069B1/fr
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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
    • C23C8/02—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
    • C23C8/80—After-treatment

Definitions

  • the invention relates to a method for treating components made of steels and metals in a process chamber under the action of pressure and temperature with a first process step in which a thermochemical surface treatment, for example case hardening, is carried out, for which purpose a gas or gas mixture is let into this process chamber .
  • a thermochemical surface treatment for example case hardening
  • thermochemical surface treatment e.g. nitriding, nitro-carburizing or boriding
  • refractory metals e.g. Ti, Zr, Mo, W. Nb, Ta, V
  • Passive layers on the materials lead to the following difficulties:
  • the passive layers mostly consist of oxides and form a thin protective skin, which disadvantageously prevents the undisturbed diffusion of non-metals such as N, C, and B during surface treatment. This completely prevents diffusion, for example in the case of refractory metals, and in some cases in the case of high-alloy steels, which leads to uneven treatment results.
  • pre-oxidation is carried out in order to achieve a uniform treatment result. This means that contaminations on the surfaces are oxidized and the already existing oxide layer is influenced. In some cases, this can influence the uniformity of the layer formation.
  • the layers produced are very thin and contain ever larger amounts of oxygen.
  • thermochemical surface treatment of metals e.g. carburizing, tempering, annealing, carbonitriding, nitrocarburizing
  • edge oxidation This edge oxidation reduces the fatigue strength, so that the life of edge-oxidized components is reduced.
  • the object of the present invention is now to develop a method which removes the edge oxidation of heat-treated parts and replaces the mechanical processing.
  • thermochemical removal of the edge oxidation generated as a result of the first process step on the components in a second process step N2 H2 or NH3 or a mixture of these gases in the process chamber and a pressure greater than 1 bar and a temperature between 100 ° C and 1,000 ° C are set independently.
  • the oxides are reduced by reacting with the gas phase and releasing their oxygen atoms or forming nitrides.
  • parts heat-treated in this way can be almost completely deoxidized.
  • Such a heat treatment can be carried out for higher-alloy steels as a replacement for the tempering treatment which is to be carried out anyway, tempering and deoxidizing are then carried out in one step.
  • thermochemical treatments with oxidizing gas components and to achieve higher fatigue strength properties on the components through the subsequent deoxidation.
  • the use of expensive and complicated mechanical post-treatments can be dispensed with.
  • the invention allows for a wide variety of designs; one of them is shown as an example in the two attached sketches.
  • the steel After the steel has been introduced into a treatment chamber 1, it is heated to 580 ° C and at a pressure of e.g. 10 bar H2 and / or NH3 is let in. In this process step, the steel used is de-passivated and at the same time provided with a thin nitride layer as protection against further oxidation.
  • the steel which is protected against oxidation, is then brought into a second treatment chamber 2.
  • a material-specific nitriding temperature of 550 ° C is set and a gas mixture of NH3, H2 is let in at a pressure of 1 bar.
  • a nitrided X 20 CrMo V 12 1 steel is obtained as the end product.
  • carbon-containing gases such as CO2 or CO can be used for coal at temperatures between 800 ° C and 1,000 ° C.
  • thermochemical treatment process for example nitriding can be carried out in a conventional nitriding plant under atmospheric pressure. This eliminates the need to use a pressure chamber, which must be designed for 30 bar, for example.

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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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (6)

  1. Procédé pour le traitement d'éléments de construction constitués d'aciers et de métaux dans une chambre de procédé sous l'action de la pression et de la température présentant une première étape de procédé, dans laquelle on réalise un traitement de surface thermochimique, par exemple la cémentation, un gaz ou un mélange gazeux étant introduit dans une chambre de procédé, caractérisé en ce qu'on laisse entrer dans la chambre de procédé dans une deuxième étape de procédé N₂, H₂ ou NH₃ ou un mélange de ces gaz pour une élimination thermochimique de l'oxydation marginale des éléments de construction et qu'on ajuste une pression supérieure à 1 bar et une température comprise entre 100°C et 1 000°C indépendamment l'une de l'autre.
  2. Procédé selon la revendication 1, caractérisé en ce qu'on traite des éléments de construction constitués d'aciers non alliés ou faiblement alliés.
  3. Procédé selon la revendication 1, caractérisé en ce qu'on traite des éléments de construction constitués d'aciers hautement alliés.
  4. Procédé selon la revendication 3, caractérisé en ce qu'on réalise simultanément avec l'élimination thermochimique de l'oxydation marginale un procédé de traitement thermique, par exemple la recuisson des aciers.
  5. Procédé selon l'une quelconque ou plusieurs des revendications 1 à 4, caractérisé en ce que la pression du procédé pendant le procédé pour l'élimination thermochimique de l'oxydation marginale est de 20 bars.
  6. Procédé selon la revendication 5, caractérisé en ce que la température du procédé est plus petite ou égale à la température de recuisson de l'acier à traiter.
EP92118403A 1991-12-04 1992-10-27 Procédé de traitement d'aciers et de métaux réfractaires Expired - Lifetime EP0545069B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4139975A DE4139975C2 (de) 1991-12-04 1991-12-04 Verfahren zur Behandlung von legierten Stählen und Refraktärmetallen und Anwendung des Verfahrens
DE4139975 1991-12-04
DE4208848 1992-03-19
DE4208848A DE4208848C2 (de) 1991-12-04 1992-03-19 Verfahren zur thermochemischen Nachbehandlung von Stählen und Metallen

Publications (2)

Publication Number Publication Date
EP0545069A1 EP0545069A1 (fr) 1993-06-09
EP0545069B1 true EP0545069B1 (fr) 1995-12-06

Family

ID=25909771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92118403A Expired - Lifetime EP0545069B1 (fr) 1991-12-04 1992-10-27 Procédé de traitement d'aciers et de métaux réfractaires

Country Status (5)

Country Link
EP (1) EP0545069B1 (fr)
JP (1) JPH0665631A (fr)
AT (1) ATE131216T1 (fr)
DE (2) DE4208848C2 (fr)
ES (1) ES2080416T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7550049B2 (en) 2002-10-31 2009-06-23 Seco/Warwick S.A. Method for under-pressure carburizing of steel workpieces

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0707661B1 (fr) * 1994-04-22 2000-03-15 Innovatique S.A. Procede pour la nitruration a basse pression d'une piece metallique et four pour la mise en uvre dudit procede
FR2719057B1 (fr) * 1994-04-22 1996-08-23 Innovatique Sa Procédé pour la nitruration à bsase pression d'une pièce métallique et four pour la mise en Óoeuvre dudit procédé.
DE10147205C1 (de) * 2001-09-25 2003-05-08 Bosch Gmbh Robert Verfahren zur Wärmebehandlung von Werkstücken aus temperaturbeständigen Stählen
DE102009002985A1 (de) * 2009-05-11 2010-11-18 Robert Bosch Gmbh Verfahren zur Carbonitrierung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544987A1 (fr) * 1991-12-04 1993-06-09 Leybold Durferrit GmbH Procédé de traitement d'acier alliés et de métaux réfractaires

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE738244C (de) * 1939-02-02 1943-08-07 Messerschmitt Boelkow Blohm Verfahren und Einrichtung zum Nitrieren von Staehlen
US2851387A (en) * 1957-05-08 1958-09-09 Chapman Valve Mfg Co Method of depassifying high chromium steels prior to nitriding
DE1933439A1 (de) * 1968-07-01 1970-01-15 Gen Electric Nitrierverfahren
GB1495703A (en) * 1973-12-12 1977-12-21 Gkn Group Services Ltd Nitriding of ferrous metals
DE2510460A1 (de) * 1975-03-11 1976-09-23 Ipsen Ind Int Gmbh Verfahren zur waermebehandlung von werkstuecken aus stahl ohne die bildung von randoxyden der legierungselemente
PL192437A1 (pl) * 1976-09-16 1978-03-28 Inst Mech Precyz Sposob obrobki cieplno-chemicznej metali
CH650532A5 (de) * 1982-09-07 1985-07-31 Ver Drahtwerke Ag Verfahren zur bildung einer haerteschicht im bauteil aus elementen der vierten, fuenften oder sechsten nebengruppen des periodischen systems oder deren legierungen.
GB8608717D0 (en) * 1986-04-10 1986-05-14 Lucas Ind Plc Metal components
JP2732403B2 (ja) * 1988-10-27 1998-03-30 財団法人応用科学研究所 難窒化金属材料のアンモニアガス窒化処理方法
DE69009603T2 (de) * 1989-07-10 1995-01-12 Daido Oxygen Verfahren zur Vorbehandlung von metallischen Werkstücken und zur Nitrierhärtung von Stahl.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544987A1 (fr) * 1991-12-04 1993-06-09 Leybold Durferrit GmbH Procédé de traitement d'acier alliés et de métaux réfractaires

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7550049B2 (en) 2002-10-31 2009-06-23 Seco/Warwick S.A. Method for under-pressure carburizing of steel workpieces

Also Published As

Publication number Publication date
DE4208848A1 (de) 1993-09-23
EP0545069A1 (fr) 1993-06-09
ES2080416T3 (es) 1996-02-01
JPH0665631A (ja) 1994-03-08
DE4208848C2 (de) 2001-08-30
DE59204598D1 (de) 1996-01-18
ATE131216T1 (de) 1995-12-15

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