EP0347409A1 - Procédé de fabrication de pièces soumises à de fortes contraintes et ayant une surface résistant à l'usure - Google Patents

Procédé de fabrication de pièces soumises à de fortes contraintes et ayant une surface résistant à l'usure Download PDF

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Publication number
EP0347409A1
EP0347409A1 EP89890161A EP89890161A EP0347409A1 EP 0347409 A1 EP0347409 A1 EP 0347409A1 EP 89890161 A EP89890161 A EP 89890161A EP 89890161 A EP89890161 A EP 89890161A EP 0347409 A1 EP0347409 A1 EP 0347409A1
Authority
EP
European Patent Office
Prior art keywords
tempering
hardness
wear
alloy
strength
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.)
Withdrawn
Application number
EP89890161A
Other languages
German (de)
English (en)
Inventor
Franz Maldet
Erich Dipl.-Ing. Hertner
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.)
Schoeller Bleckmann GmbH
Schoeller Bleckman Stahlwerke AG
Original Assignee
Schoeller Bleckmann GmbH
Schoeller Bleckman Stahlwerke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schoeller Bleckmann GmbH, Schoeller Bleckman Stahlwerke AG filed Critical Schoeller Bleckmann GmbH
Publication of EP0347409A1 publication Critical patent/EP0347409A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation

Definitions

  • the invention relates to a process for the production of highly stressed parts with a wear-resistant surface, in particular tools made of hot-work steel, for the chipless shaping of workpieces with temperatures of above 250 ° C., in particular above 400 ° C., and parts produced by this process.
  • Highly stressed components in particular tools for non-cutting deformation of workpieces with higher temperatures, are subject to different loads in practical use, which consistently combine material stresses consisting of e.g. Cause pressure, tension, bending, abrasion or wear, etc.
  • appropriate material selection or use of a hardenable steel is carried out, the properties of which can be adjusted by means of a tempering process consisting of hardening and tempering treatments.
  • the chemical composition of the hardenable steel or the alloy determines the conversion behavior during heat treatment.
  • the remuneration process that ultimately brings about the properties of the tool should be selected with regard to the critical type of stress.
  • tools subject to bending and wear are made of tough material due to the risk of breakage, or the hardenable alloy becomes one subject to high toughness-based remuneration procedures.
  • this tempering treatment tailored to this alloy the required toughness properties of the material are achieved, but the desired high hardness and wear resistance of the tool cannot be set, so that its service life is unsatisfactory.
  • Hard coatings e.g. with titanium nitride, only improved the service life in some cases.
  • the object of the invention was to develop a method for high to create stressed parts with a hard, wear-resistant surface, in particular tools made of hot-work steel, for the non-cutting shaping of workpieces with temperatures of over 250 ° C., in particular over 400 ° C.
  • Another object of the invention concerned highly stressed parts with a hard, wear-resistant surface, in particular tools made of hot-work steel, for the non-cutting shaping of workpieces with temperatures of over 250 ° C., in particular over 400 ° C.
  • This object is achieved in a method in that the part made of a hardenable steel alloy undergoes a heat treatment consisting of at least one cooling of at least the austenitizing temperature, in particular 1050 ° C., and one or more warmings to tempering temperatures, in particular between 510 and 610 ° C, whereupon one or more overlay hardening (s), possibly in the surface areas or zones close to the surface subject to abrasion or wear, by local heating with high power density to at least the austenitizing temperature and an accelerated cooling of the austenitized area or in the austenitic area State of the alloy present near-surface zone below the martensite point of the alloy.
  • a heat treatment consisting of at least one cooling of at least the austenitizing temperature, in particular 1050 ° C., and one or more warmings to tempering temperatures, in particular between 510 and 610 ° C, whereupon one or more overlay hardening (s), possibly in the surface areas or zones close to the surface subject to abrasion or wear, by
  • the heating of the zone near the surface is carried out with a power density of at least 1 ⁇ 10 3 W / cm 2 and the structure is austenitized to a depth of at most 8 mm, preferably at most 5 mm. It is particularly advantageous if, after the zone near the surface has been heated, the area in the austenitic microstructure is rapidly cooled below the martensite point of the alloy with high intensity by essentially dissipating heat into the part or by dissipating heat through the part.
  • the solution of a further object is that the part has a tempering structure with high material toughness, which merges in the direction of the surface, in particular in the areas of the surface that are subject to wear, into a martensitic structure with high strength and high hardness. It is advantageous if the strength and hardness of the transition area from the tempering structure of the base material to the martensitic structure of the surface zone, which has a thickness of at least 0.2 mm, preferably at least 0.5 mm, but at most 8 mm, preferably at most 5 mm, are essentially increasing.
  • the tempering structure has a strength of 1450 N / mm2 to 1780 N / mm2 and a hardness of 480 HV to 520 HV, and the surface or the martensitic zone near the surface has a strength of 1800 N / mm2 to 1900 N / mm2 , and a hardness of 550 HV to 650 HV.
  • the tempering method is advantageously performed in such a way that in the transition area from the tempering structure of the base material to the martensitic structure of the zone near the surface, the values for the drop in strength are at most 150 N / mm2, preferably less than 80 N / mm2, and the values for drop in hardness are at most 50 HV, preferably less than 30 HV, these tempered parts are subsequently reheated to temperatures in the range above the tempering temperature and below the austenitizing temperature, so as is known to any person skilled in the art, the strength and hardness of the part decrease significantly to low values, this material state also h for the machining of Tools is used. This effect of the decisive reduction in strength and hardness also occurs in the case of partial heating to the austenitizing temperature with conventional methods for tempered parts,
  • the matrices were subjected to a tempering treatment consisting of hardening by cooling from a temperature of 1050 ° C., followed by a first tempering in the range of the secondary hardness maximum of the alloy at a temperature of 510 ° C., a second tempering at working temperature at a temperature of 610 ° C and a third temper to relax at a temperature of 580 ° C followed.
  • the same superimposed hardening of the surface zones subject to abrasion was carried out on two matrices by laser beam heating with an intensity of 3.25 x 103 W / cm2.
  • the hardened matrix and a matrix with overlay hardening were tested for the production of compacts with the same cross-section.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
EP89890161A 1988-06-13 1989-06-12 Procédé de fabrication de pièces soumises à de fortes contraintes et ayant une surface résistant à l'usure Withdrawn EP0347409A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1517/88 1988-06-13
AT151788A AT393696B (de) 1988-06-13 1988-06-13 Verfahren zur herstellung von hochbeanspruchten teilen mit verschleissfester oberflaeche

Publications (1)

Publication Number Publication Date
EP0347409A1 true EP0347409A1 (fr) 1989-12-20

Family

ID=3515360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89890161A Withdrawn EP0347409A1 (fr) 1988-06-13 1989-06-12 Procédé de fabrication de pièces soumises à de fortes contraintes et ayant une surface résistant à l'usure

Country Status (2)

Country Link
EP (1) EP0347409A1 (fr)
AT (1) AT393696B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6174388B1 (en) * 1999-03-15 2001-01-16 Lockheed Martin Energy Research Corp. Rapid infrared heating of a surface
WO2007014610A1 (fr) * 2005-07-29 2007-02-08 Zf Friedrichshafen Ag Procédé pour recuire des pièces sans contact par un rayonnement en faisceau

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0001889A1 (fr) * 1977-10-17 1979-05-16 Sciaky Bros., Inc. Procédé pour la trempe superficielle des métaux
DE2940127A1 (de) * 1978-10-05 1980-04-17 Coherent Inc Verfahren und vorrichtung zur waermebehandlung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD204106B1 (de) * 1982-03-31 1988-02-03 Adw Ddr Verfahren zur oberflaechenhaertung von eisen-kohlenstoff-legierungen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0001889A1 (fr) * 1977-10-17 1979-05-16 Sciaky Bros., Inc. Procédé pour la trempe superficielle des métaux
DE2940127A1 (de) * 1978-10-05 1980-04-17 Coherent Inc Verfahren und vorrichtung zur waermebehandlung

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
DESIGN ENGINEERING, Oktober 1987, Seiten 47,48,50,54, London, GB; "Industrial lasers making light work" *
HÄRTEREI-TECHNISCHE MITTEILUNGEN (HTM), Band 42, Nr. 2, März/April 1987, Seiten 83-89, Carl Hanser Verlag, München, DE; J. RUGE et al.: "Untersuchungen zum Elektronenstrahl-Randschichthärten von Warmarbeitsstahl" *
HTM - HÄRTEREI-TECHNISCHE MITTEILUNGEN, Band 43, Nr. 2, März/April 1988, Seiten 103-111, Carl Hanser Verlag, München, DE; S. PANZER et al.: "Härten von Oberflächen mit Elektronenstrahlen" *
JOURNAL OF METALS, Band 35, Nr. 5, Mai 1983, Seiten 18-26, Warrendale, Pennsylvania, US; J. MAZUMDER: "Laser heat treatment: The state of the art" *
PATENT ABSTRACTS OF JAPAN, Band 13, Nr. 156 (C-585)[3504], 14. April 1989; & JP-A-63 312 914 (BROTHER IND. LTD) 21-12-1988 *
PATENT ABSTRACTS OF JAPAN, Band 3, Nr. 75 (C-50), 27. Juni 1979, Seite 150 C 50; & JP-A-54 526 625 (TOKYO SHIBAURA DENKI K.K.) 25-04-1979 *
WELDING INTERNATIONAL, Band 2, Nr. 2, 1988, Seiten 180-183, Abington, Cambridge, GB; M. MÜLLER et al.: "Surface hardening by electron beam" *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6174388B1 (en) * 1999-03-15 2001-01-16 Lockheed Martin Energy Research Corp. Rapid infrared heating of a surface
US6432555B1 (en) 1999-03-15 2002-08-13 U.T. Battelle, Llc Rapid infrared heating of a surface
US6667111B2 (en) 1999-03-15 2003-12-23 Ut Battelle Llc Rapid infrared heating of a surface
WO2007014610A1 (fr) * 2005-07-29 2007-02-08 Zf Friedrichshafen Ag Procédé pour recuire des pièces sans contact par un rayonnement en faisceau

Also Published As

Publication number Publication date
AT393696B (de) 1991-11-25
ATA151788A (de) 1991-05-15

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