EP0627019B1 - Procede de traitement thermochimique-thermique d'aciers de cementation - Google Patents

Procede de traitement thermochimique-thermique d'aciers de cementation Download PDF

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Publication number
EP0627019B1
EP0627019B1 EP93901704A EP93901704A EP0627019B1 EP 0627019 B1 EP0627019 B1 EP 0627019B1 EP 93901704 A EP93901704 A EP 93901704A EP 93901704 A EP93901704 A EP 93901704A EP 0627019 B1 EP0627019 B1 EP 0627019B1
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EP
European Patent Office
Prior art keywords
temperature
nitrogen
carbon
nitrocarburising
holding time
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
EP93901704A
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German (de)
English (en)
Other versions
EP0627019A1 (fr
Inventor
Wenzel Bina
Dieter Ekkert
Werner Kreiss
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.)
INA Waelzlager Schaeffler OHG
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INA Waelzlager Schaeffler OHG
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/78—Combined heat-treatments not provided for above
    • 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
    • C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
    • C23C8/52—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 liquids, e.g. salt baths, liquid suspensions more than one element being applied in one step
    • C23C8/54—Carbo-nitriding
    • C23C8/56—Carbo-nitriding of ferrous surfaces

Definitions

  • the invention relates to a method for thermochemical-thermal Treatment of case-hardened steels in which an edge zone of a workpiece, in particular bucket tappets, roller bearing parts, gear and coupling elements, enriched with carbon and nitrogen and then undergoes a martensitic hardening.
  • One such method is carbonitriding to treat a Workpiece in the austenitic state with the purpose of enrichment the surface layer with carbon and with nitrogen, whereby both elements are then in the austenite in solid solution. In connection this treatment generally takes place immediately Quenching to achieve hardening.
  • carbonitriding the surface hardness and wear resistance of the construction parts improved (technology of heat treatment of steel, p. 169 ff, VEB German publishing house for basic materials industry, Leipzig 1986).
  • the workpieces treated by this method have improved Properties with regard to wear resistance, the however for components that are subject to high tribological stresses such as the contact surfaces of tappets in the valve train of an internal combustion engine are not sufficient in every application. Beyond that due to the required shape accuracy in carbonitrided parts Grinding of these components necessary, so that in the course of this cutting Shaping the highly enriched, wear-resistant outermost surface layer is at least partially ground away.
  • Nitro carburizing This is a thermochemical process for enriching the Surface layer of a workpiece with nitrogen and carbon with formation a connection layer, a below the connection layer especially forms nitrogen-enriched diffusion layer. requirement for The functionality of nitro-carburized parts is next to the existence this sufficiently thick connection layer enriched with nitrogen and carbon a corresponding supporting effect of the diffusion layer the naturally more or less brittle connection layer.
  • thermochemical-thermal treatment of ferrous materials its marginal zones enriched with carbon and nitrogen and subsequently subjected to a martensitic hardening is from FR-A-22 83 244 known. This is done in such a way that the parts to be treated carbonitrided, quenched in oil, nitro carburized, quenched and tempered be cooled down again.
  • the object of the present invention is a thermochemical-thermal To create treatment methods that are highly stressed tribologically Components ensure sufficient wear resistance.
  • a first process step consists of carbonitriding at a temperature from 780 to 1,050 ° C, with carburization and Embroidery of 0.4 to 0.9 weight percent carbon and 0.1 to 0.8 preferably 0.3 to 0.7 weight percent nitrogen is set.
  • the high Temperatures ensure that the austenite in the peripheral zone is a corresponding has high solvency for both carbon and nitrogen.
  • the enrichment of the diffusion elements nitrogen and carbon has to be carried out so that their solubility in austenite is not exceeded, d.
  • the coal potential in the atmosphere is according to the S-E line in the Coordinate iron carbon diagram. The same applies to the nitrogen supply according to the iron-nitrogen state diagram.
  • the hold time during carbonitriding which lasts one to four hours can be based on the desired hardening depth, the The upper limit can be one millimeter.
  • the chemical is reached Composition of the edge zone by diffusion of carbon and Nitrogen at the temperatures mentioned in a known manner Use a working gas that has both carbon-emitting components and also contains nitrogen-donating components.
  • Nitro carburizing is carried out at a temperature of 530 to 570 ° C.
  • these temperatures are below the eutectoid temperature and on the other hand high enough to grow at a sufficiently high rate build the connection layer. Beyond that comes there is no additional structural transformation in this temperature range in the embroidered edge area, so that a quenching and with it associated dimensional and shape changes can be dispensed with.
  • nitro carburizing can also be carried out in plasma or in a salt bath.
  • thermochemical-thermal Treatment will give the material high wear resistance and Load-bearing capacity awarded because the one below the connection layer and this supporting diffusion layer significantly improved Supportive effect, so that even with the highest tribological loads the connection layer is not caused by plastic deformation of the underlying diffusion layer can be damaged.
  • the carbonitriding takes place at one Temperature from 780 to 1050 ° C. Depending on the desired hardening depth carburizing and nitriding take place within 1 to 4 hours the edge zone.
  • This phase is followed by a phase 2, in which the Microstructure at a temperature significantly below the martensite starting point of the Edge zone is quenched.
  • the material Annealed at 20 to 40 ° C above the nitro carburizing temperature for 1 to 2 hours.
  • the material is Protective gas atmosphere cooled before in as shown in dashed lines in a fifth phase the parts of an exciting molding process be subjected to bring them to their final dimension.
  • a sixth phase takes place within 60 to 150 minutes Build a 2 to 20 ⁇ m, preferably 6 to 12 ⁇ m thick, closed Link layer.
  • the ground parts are used for this Temperatures of 500 to 620 ° C in a gas mixture of ammonia, Treated carbon dioxide, nitrogen and endogas or exogas.
  • the last phase 7 closes the cooling of the nitro carburized material under protective gas in the oven or by quenching in oil or aqueous Media. Places that are not subject to wear can be chipping be reworked.
  • Figure 2 shows schematically the layer structure of the edge zone one behind part treating the method according to the invention.
  • the diffusion layer 9 follows, which consists of nitrides, carbides, carbonitrides and ferrite.
  • the Size relationships between connection layer and diffusion layer are such that the thickness of the connection layer is up to 20 ⁇ m while the diffusion layer has a thickness of several tenths Can have millimeters. Connects to the diffusion layer 9 the starting material 10.
  • the supporting effect is that under the connecting layer diffusion layer by carbonitriding and tempering significantly improved compared to an only nitro-carburized part.

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

Claims (4)

  1. Procédé de traitement thermochimique et thermique d'aciers de cémentation, dans lesquels une zone superficielle d'une pièce à oeuvrer, en particulier d'un poussoir à cloche, de parties de paliers à rouleaux, d'éléments de transmission et d'embrayage, sont enrichis avec du carbone et de l'azote et sont ensuite exposé à un durcissement martensitique,
    caractérisé en ce que
    dans une première séquence du procédé a lieu une carbonitruration (1) à une température comprise entre 780 et 1050°C avec une carbonisation et une nitruration de la zone superficielle d'un pourcentage en poids de carbone de 0,4 à 0,9 et d'un pourcentage en poids d'azote de 0,1 à 0,8 lors d'un temps de maintien de 1 à 4 heures,
    dans une seconde séquence du procédé à la carbonitruration (1) fait suite une trempe (2) à une température nettement en dessous du point martensitique de la zone superficielle,
    une troisième séquence du procédé est un processus de revenu (3) que l'on effectue à une température de 20 à 40°C supérieure à la température de la nitrocarburation suivante, avec une vitesse de chauffage comprise entre 10 et 30°C par minute et un temps de maintien de 1 à 2 heures,
    vient à la suite comme quatrième séquence du procédé un refroidissement (4)à la température ambiante, et
    à la suite on a comme cinquième séquence du procédé une mise en forme (5) des pièces à oeuvrer par enlèvement de copeaux, et
    suit comme sixième séquence du procédé une nitrocarburation (6) dans un mélange gazeux, se composant d'ammoniac de dioxyde de carbone, d'azote et de gaz endo- ou exothermiques à une température de 500 à 620°C avec un temps de maintien de 60 à 150 minutes, séquence à laquelle se raccorde comme dernière séquence du procédé un refroidissement à la température ambiante.
  2. Procédé de traitement thermochimique et thermique d'aciers de cémentation selon la revendication 1,
    caractérisé en ce que
    la nitrocarburation (6) a lieu à une température de 530 à 570°C.
  3. Procédé de traitement thermochimique et thermique d'aciers de cémentation selon la revendication 1,
    caractérisé en ce que
    la nitrocarburation (6) a lieu dans le plasma ou un bain de sel.
  4. Procédé de traitement thermochimique et thermique d'aciers de cémentation, dans lesquels une zone superficielle d'une pièce à oeuvrer, en particulier d'un poussoir à cloche, de parties de paliers à rouleaux, d'éléments de transmission et d'embrayage, sont enrichis avec du carbone et sont ensuite exposé à un durcissement martensitique,
    caractérisé en ce que
    dans une première séquence du procédé a lieu une cémentation (1) à une température comprise entre 780 et 1050°C avec une carbonisation de la zone superficielle d'un pourcentage en poids de carbone de 0,4 à 0,9 lors d'un temps de maintien de 1 à 4 heures,
    dans une seconde séquence du procédé à la cémentation (1) fait suite une trempe (2) à une température nettement en dessous du point martensitique de la zone superficielle,
    une troisième séquence du procédé est un processus de revenu (3) que l'on effectue à une température de 20 à 40°C supérieure à la température de la nitrocarburation suivante, avec une vitesse de chauffage comprise entre 10 et 30°C par minute et un temps de maintien de 1 à 2 heures,
    vient à la suite comme quatrième séquence du procédé un refroidissement (4)à la température ambiante, et
    à la suite on a comme cinquième séquence du procédé une mise en forme (5) des pièces à oeuvrer par enlèvement de copeaux, et
    suit comme sixième séquence du procédé une nitrocarburation (6) dans un mélange gazeux, se composant d'ammoniac de dioxyde de carbone, d'azote et de gaz endo- ou exothermiques à une température de 500 à 620°C avec un temps de maintien de 60 à 150 minutes, séquence à laquelle se raccorde comme dernière séquence du procédé un refroidissement à la température ambiante.
EP93901704A 1992-02-25 1992-12-18 Procede de traitement thermochimique-thermique d'aciers de cementation Expired - Lifetime EP0627019B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4205647A DE4205647C2 (de) 1992-02-25 1992-02-25 Verfahren zur thermochemisch-thermischen Behandlung von Einsatzstählen
DE4205647 1992-02-25
PCT/EP1992/002951 WO1993017146A1 (fr) 1992-02-25 1992-12-18 Procede de traitement thermochimique-thermique d'aciers de cementation

Publications (2)

Publication Number Publication Date
EP0627019A1 EP0627019A1 (fr) 1994-12-07
EP0627019B1 true EP0627019B1 (fr) 1998-04-01

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EP93901704A Expired - Lifetime EP0627019B1 (fr) 1992-02-25 1992-12-18 Procede de traitement thermochimique-thermique d'aciers de cementation

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EP (1) EP0627019B1 (fr)
DE (2) DE4205647C2 (fr)
WO (1) WO1993017146A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3326874B2 (ja) 1993-05-31 2002-09-24 日本精工株式会社 転がり軸受
DE4327440C2 (de) * 1993-08-14 1997-07-03 Schaeffler Waelzlager Kg Verfahren zur thermochemisch-thermischen Behandlung von Einsatzstählen, Vergütungsstählen und Wälzlagerstählen
DE4418245C2 (de) * 1993-08-14 2003-06-18 Ina Schaeffler Kg Verfahren zur thermochemisch-thermischen Behandlung einer Gleitfläche eines Nockens und/oder einer Gleitfläche eines Nockengegenläufers
JP3411637B2 (ja) * 1993-10-05 2003-06-03 本田技研工業株式会社 内燃機関用ロッカアームの製造方法
US5575064A (en) * 1994-12-06 1996-11-19 Honda Giken Kogyo Kabushiki Kaisha Process for producing rocker arm for internal combustion engine
JPH1060619A (ja) * 1996-08-13 1998-03-03 Tochigi Fuji Ind Co Ltd 構造用鋼製部材
US6224266B1 (en) * 1998-09-18 2001-05-01 Ntn Corporation Wheel bearing device
DE102004028221A1 (de) 2004-06-09 2005-12-29 Ina-Schaeffler Kg Hochbeanspruchtes Motorenbauteil
DE102004043550B4 (de) * 2004-09-09 2012-02-16 Schaeffler Technologies Gmbh & Co. Kg Verschleißfeste Beschichtung, ihre Verwendung und Verfahren zur Herstellung derselben
JP5898092B2 (ja) * 2010-12-13 2016-04-06 川崎重工業株式会社 駆動カム、その製造方法、及びエンジンの動弁装置
CN104540970A (zh) * 2012-08-21 2015-04-22 Skf公司 热处理钢构件的方法及钢构件
DE102015204656A1 (de) * 2015-03-16 2016-09-22 Aktiebolaget Skf Schichtbildung für Wälzlagerkomponenten
SE1550958A1 (en) * 2015-07-03 2017-01-04 Scania Cv Ab A rocker arm and a rocker arm assembly
DE102018208283A1 (de) * 2018-05-25 2019-11-28 Robert Bosch Gmbh Verfahren zum Herstellen eines metallischen Bauteils
CN111945104A (zh) * 2020-08-17 2020-11-17 沈阳飞机工业（集团）有限公司 薄层氮碳共渗方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1461083A (en) * 1973-12-08 1977-01-13 Bell T Methods of treating metal
SU609771A1 (ru) * 1976-12-22 1978-05-10 Предприятие П/Я В-2302 Способ обработки стальных изделий
EP0033403A1 (fr) * 1980-01-31 1981-08-12 Ford Motor Company Procédé de traitement de la surface d'articles en acier à haute teneur en carbone et articles en acier à haute teneur en carbone
DE3235807A1 (de) * 1981-10-01 1983-04-21 Kabushiki Kaisha Komatsu Seisakusho, Tokyo Oberflaechenhaertung von stahl durch waermebehandlung
SE441933B (sv) * 1984-02-14 1985-11-18 Ibm Svenska Ab Uppkolnings- och vermebehandlingsprocess for en maskindel, exempelvis en tryckhammare
JP2779170B2 (ja) * 1988-07-25 1998-07-23 マツダ株式会社 浸炭焼入方法

Also Published As

Publication number Publication date
EP0627019A1 (fr) 1994-12-07
DE4205647C2 (de) 1996-08-01
DE59209268D1 (de) 1998-05-07
WO1993017146A1 (fr) 1993-09-02
DE4205647A1 (de) 1993-08-26

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