EP0354389A1 - Procédé pour la fabrication de pièces d'acier fritté et pièces ainsi obtenues - Google Patents

Procédé pour la fabrication de pièces d'acier fritté et pièces ainsi obtenues Download PDF

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Publication number
EP0354389A1
EP0354389A1 EP89113211A EP89113211A EP0354389A1 EP 0354389 A1 EP0354389 A1 EP 0354389A1 EP 89113211 A EP89113211 A EP 89113211A EP 89113211 A EP89113211 A EP 89113211A EP 0354389 A1 EP0354389 A1 EP 0354389A1
Authority
EP
European Patent Office
Prior art keywords
sintered
degrees
minutes
temperature
molded part
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.)
Granted
Application number
EP89113211A
Other languages
German (de)
English (en)
Other versions
EP0354389B1 (fr
Inventor
Dieter Dr.Rer.Nat. Pohl
Hans A. Dipl.-Ing. Härle
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.)
Schwaebische Huettenwerke Automotive GmbH
Original Assignee
Schwaebische Huettenwerke Automotive GmbH
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 Schwaebische Huettenwerke Automotive GmbH filed Critical Schwaebische Huettenwerke Automotive GmbH
Publication of EP0354389A1 publication Critical patent/EP0354389A1/fr
Application granted granted Critical
Publication of EP0354389B1 publication Critical patent/EP0354389B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F3/26—Impregnating
    • 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
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening

Definitions

  • the invention relates to a method for producing a molded part from sintered steel, sintered steel powder being compression-molded and sintered, after which the sintered part is austenitized by heating to temperatures of over 800 degrees and then rapidly cooled.
  • the invention also relates to a molded part produced by the method.
  • One of the essential features of the known molded parts made of sintered steel is the accuracy with which they can be produced. They are diameter tolerant high quality achievable. After the usual work sequence with a compression molding and a subsequent sintering, the sintered molding is calibrated for this. The high accuracy is achieved through the calibration process. Shaped parts that are not post-treated by calibration or another work process do not have such a high tolerance with sufficient repeatability.
  • sintered molded parts Another characteristic of sintered molded parts is their more or less large porosity of their microstructure. These pores represent internal notches and thus have a significant influence on the material properties. With sintered steels, considerable yield strengths and tensile strength values can be achieved, but their plastic deformability, which e.g. is measured as elongation at break, and their toughness, e.g. measured as impact work are small.
  • the strength limits the achievable accuracy of sintered molded parts. This is because post-sintering can only be carried out economically, for example by calibration, if the strength of the material does not exceed 500 to at most 600 N / mm2.
  • Sintered steels with clear Higher tensile strengths can be easily produced, for example up to about 1200 N / mm2 tensile strength, because molded parts made of such materials can also be pressed and sintered, but they can no longer be economically calibrated to increase accuracy.
  • a high strength of sintered steels can be achieved by alloying measures or by heat treatment, if necessary by a combination of both measures. Alloying measures have the disadvantage mentioned that a high strength is achieved, but no economical calibration was possible to achieve the required accuracy.
  • the present invention is therefore based on the object of providing a method for producing a sintered part and a sintered part produced thereafter, which has a high strength but at the same time also has good ductility, with the aim of achieving the highest possible dimensional accuracy.
  • this object is achieved in that, after the austenitic heat treatment, the sintered part is cooled to a temperature of 280 to 450 degrees C and held in this temperature range between 5 and 60 minutes, with a bainitic micro structure of the structure is reached.
  • the first possibility is that the compression of the part to be sintered is chosen so high that a pore volume of less than 8% is achieved. With such a percentage, the pores are essentially no longer interconnected. This means that salt can then only settle in the heat treatment in pores that are open to the surface of the sintered part. From there it can be easily washed out later.
  • the second possibility is that the pores of the sintered part are at least partially filled with a filler which is resistant to the agents and chemicals used in a rapid cooling in a bath.
  • metallic substances whose melting point is above the temperature of austenitizing but below the sintering temperature. This is e.g. generally the case for copper and corresponding copper alloys.
  • non-metallic substances such as e.g. ceramic materials are used.
  • ceramic materials e.g. Silicates or a mixture or a thin paste of talc and water glass possible.
  • Numerous sintered steel powders commonly used in sintering molded part production are suitable for intermediate stage tempering. Both fully alloyed, i.e. atomize, as well as mixed alloy or alloyed powder. Pre-alloyed powders are obtained by melting iron with the desired alloy components, after which the melt is atomized into powder, which is then compression-molded in the usual way.
  • Mixed alloy powder means that iron powder is mixed with alloy powder, after which the dry powder mixture is also compression molded.
  • a middle way is the combination of both processes, which creates an alloyed powder for the subsequent compression molding.
  • alloyed powders with, for example, 1.5 to 2% by weight of Ni, 0.3 to 0.6% by weight of Mo are mixed with a corresponding residual amount of iron, it being additionally possible to add 0.3 to 1% by weight of graphite . Possibly. copper can be tolerated as a shrinking alloy element in the usual framework.
  • a molded part 1 is formed whose pores 2 are filled with copper.
  • R p limit of proportionality
  • R m strength
  • A% elongation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Powder Metallurgy (AREA)
EP89113211A 1988-07-27 1989-07-19 Procédé pour la fabrication de pièces d'acier fritté et pièces ainsi obtenues Expired - Lifetime EP0354389B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3825463 1988-07-27
DE3825463A DE3825463A1 (de) 1988-07-27 1988-07-27 Verfahren zum herstellen eines formteiles aus sintermetall und daraus hergestelltes formteil

Publications (2)

Publication Number Publication Date
EP0354389A1 true EP0354389A1 (fr) 1990-02-14
EP0354389B1 EP0354389B1 (fr) 1994-05-04

Family

ID=6359640

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89113211A Expired - Lifetime EP0354389B1 (fr) 1988-07-27 1989-07-19 Procédé pour la fabrication de pièces d'acier fritté et pièces ainsi obtenues

Country Status (4)

Country Link
EP (1) EP0354389B1 (fr)
DE (2) DE3825463A1 (fr)
ES (1) ES2054943T3 (fr)
PT (1) PT91283B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0747154A1 (fr) * 1995-06-07 1996-12-11 MANNESMANN Aktiengesellschaft Procédé et appareil pour la fabrication des pièces frittées
DE19524251C1 (de) * 1995-07-04 1997-02-13 Supervis Ets Verfahren zur Herstellung eines gesinterten Formteiles
GB2364326A (en) * 2000-05-02 2002-01-23 Hitachi Powdered Metals Valve seat material and production method
WO2003106079A1 (fr) * 2002-06-14 2003-12-24 Höganäs Ab Poudre a base de fer alliee, procede d'elaboration de produits frittes, et produit resultant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2566752A (en) * 1948-10-14 1951-09-04 American Electro Metal Corp Method of producing a ferrous metal article infiltrated with a cuprous infiltrant
DE2507375A1 (de) * 1974-02-21 1975-08-28 Nippon Piston Ring Co Ltd Eisenhaltige sinterlegierung mit verbesserter verschleissfestigkeit und verfahren zu deren herstellung
US4002471A (en) * 1973-09-24 1977-01-11 Federal-Mogul Corporation Method of making a through-hardened scale-free forged powdered metal article without heat treatment after forging
US4343661A (en) * 1978-11-15 1982-08-10 Caterpillar Tractor Co. Method of making a low temperature bainite steel alloy gear
DE3142359A1 (de) * 1981-10-26 1983-05-05 Horst Dipl.-Phys. Dr. 6000 Frankfurt Mühlberger Verfahren und vorrichtung zur waermebehandlung von werkstuecken

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2566752A (en) * 1948-10-14 1951-09-04 American Electro Metal Corp Method of producing a ferrous metal article infiltrated with a cuprous infiltrant
US4002471A (en) * 1973-09-24 1977-01-11 Federal-Mogul Corporation Method of making a through-hardened scale-free forged powdered metal article without heat treatment after forging
DE2507375A1 (de) * 1974-02-21 1975-08-28 Nippon Piston Ring Co Ltd Eisenhaltige sinterlegierung mit verbesserter verschleissfestigkeit und verfahren zu deren herstellung
US4343661A (en) * 1978-11-15 1982-08-10 Caterpillar Tractor Co. Method of making a low temperature bainite steel alloy gear
DE3142359A1 (de) * 1981-10-26 1983-05-05 Horst Dipl.-Phys. Dr. 6000 Frankfurt Mühlberger Verfahren und vorrichtung zur waermebehandlung von werkstuecken

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
METAL PROGRESS, Band 108, Nr. 2, Juli 1975, Seiten 66-69; H. FERGUSON: "Heat treatment of P/M parts" *
PATENT ABSTRACTS OF JAPAN, Band 5, Nr. 29 (M-56)[701], 21. Februar 1981; & JP-A-55 154 505 (KIYOUWA GOUKIN K.K.) 02-12-1980 *
STAHL UND EISEN, Band 98, Nr. 1, 12. Januar 1978, Seiten 23-37; A. KINDLER: "Möglichkeiten der Oberflächenbehandlung von Sinterteilen" *
WPIL, Derwent, Woche 17, 1984, Zusammenfassung Nr. 84-104379; & JP-A-59 047 345 (SUMITOMO ELEC. IND. K.K.) 17-03-1984 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0747154A1 (fr) * 1995-06-07 1996-12-11 MANNESMANN Aktiengesellschaft Procédé et appareil pour la fabrication des pièces frittées
DE19524251C1 (de) * 1995-07-04 1997-02-13 Supervis Ets Verfahren zur Herstellung eines gesinterten Formteiles
GB2364326A (en) * 2000-05-02 2002-01-23 Hitachi Powdered Metals Valve seat material and production method
US6660056B2 (en) 2000-05-02 2003-12-09 Hitachi Powdered Metals Co., Ltd. Valve seat for internal combustion engines
KR100412204B1 (ko) * 2000-05-02 2003-12-24 히다치 훈마츠 야킨 가부시키가이샤 내연기관용 소결 밸브 시트 및 그 제조방법
GB2364326B (en) * 2000-05-02 2004-02-18 Hitachi Powdered Metals Valve seat for internal combustion engines and process of production therefor
WO2003106079A1 (fr) * 2002-06-14 2003-12-24 Höganäs Ab Poudre a base de fer alliee, procede d'elaboration de produits frittes, et produit resultant
CN1662327B (zh) * 2002-06-14 2013-07-17 霍加纳斯股份有限公司 预合金化铁基粉末、生产烧结部件的方法和一种部件

Also Published As

Publication number Publication date
ES2054943T3 (es) 1994-08-16
DE58907598D1 (de) 1994-06-09
EP0354389B1 (fr) 1994-05-04
DE3825463A1 (de) 1990-02-01
PT91283A (pt) 1990-02-08
PT91283B (pt) 1995-03-01

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