EP0226625A1 - Alliages frittables a base d'aciers rapides - Google Patents

Alliages frittables a base d'aciers rapides

Info

Publication number
EP0226625A1
EP0226625A1 EP86904075A EP86904075A EP0226625A1 EP 0226625 A1 EP0226625 A1 EP 0226625A1 EP 86904075 A EP86904075 A EP 86904075A EP 86904075 A EP86904075 A EP 86904075A EP 0226625 A1 EP0226625 A1 EP 0226625A1
Authority
EP
European Patent Office
Prior art keywords
iron powder
alloys
powder
mixture
sintered alloys
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.)
Pending
Application number
EP86904075A
Other languages
German (de)
English (en)
Inventor
Barbara Heinze
Hans-Peter Koch
Gundmar Leuze
Hans Obenaus
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0226625A1 publication Critical patent/EP0226625A1/fr
Pending legal-status Critical Current

Links

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%
    • 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
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • 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
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C22C33/0214—Using a mixture of prealloyed powders or a master alloy comprising P or a phosphorus compound

Definitions

  • the invention is based on sintered alloys according to the type of the main claim.
  • Sintered high-speed steels are characterized by high hardness, very good wear behavior and satisfactory toughness.
  • Powder metallurgical processes for the production of objects from such steels ensure very high material utilization and low energy consumption. Nevertheless, they have so far only been used essentially in the area of highly stressed cutting tools, but they have not yet been able to establish themselves as wear parts in machine and vehicle construction because the powder prices are high, the sintering of the material is time-consuming and requires special vacuum ovens and the dimensional accuracy of the sintered parts is unsatisfactory, so that expensive mechanical post-processing is usually necessary.
  • the sintered alloys according to the invention with the characterizing features of the main claim have the advantage that they can be sintered in normal furnaces under protective gases without the shrinkage occurring in pure high-speed steels. Temperature deviations from the target value during sintering in a protective gas furnace, which are known to lead to strong dimensional variations of the molded parts in pure high-speed steel powders, are practically insignificant. In contrast to pure high-speed steels, these mixed materials are deliberately not optimized for full density, but rather for processability that is as accurate as possible. The properties of these combination steels can be improved in a similar way to pure high-speed steels by heat treatment corresponding to high-speed steels without their dimensional stability being impaired.
  • Another advantage is that by replacing part of the high-speed steel powder with cheaper iron powder, up to 40% of the powder costs can be saved. It has already been indicated above that the hardness, wear and bending strength values of the pure high-speed steels are not achieved by these combination materials - if only because of the pores present - but the values of the case-hardened normal sintered steels are exceeded. Due to the presence of the pores, the use of the sintered steels according to the invention is particularly advantageous where hard and wear-resistant surfaces with pores are required to absorb lubricants.
  • Sintered alloys made from 65% by weight of a powder of high-speed steel of type S 65.2 with approximately 0.9% C; 6.3% W; 5.2% Mo; 4.2% Cr; 1.9% V; Balance Fe and 35% by weight of a phosphorus-alloyed iron powder with 0.45% P; 1.5 - 2% Si, rest Fe, because they have particularly good hardness and wear properties and can also be sintered in a very dimensionally stable manner.
  • the component added to the high-speed steel powder in contrast to this, does not form a liquid phase, it acts here as a supporting structure which counteracts the tendency of the high-speed steel powder to shrink. Only when the high-speed steel powder is above 50% does the liquid phase former begin to prevail, which means that the material shrinks.
  • the components are mixed thoroughly and then compressed under pressures of 600 to 800 MN / m 2 and sintered in chamber furnaces under pure hydrogen or nitrogen / hydrogen mixed gases at 1 250 ° C. for one hour.
  • the shrinkage during sintering is included less than 0.2%. If the workpieces are quenched from a temperature of 1,190 ° C and tempered twice for 6 ⁇ min at 550 ° C, hardnesses between 500 and 575 HV3 are achieved.
  • the bending strength is 1,500 to 1,800 N / mm 2 .
  • An example of such a mixture is a mixture consisting of 65% of the above high-speed steel powder and 35% of an iron-silicon-phosphor powder material with 2% Si and 0.45% P, which was processed in the same way as this has been described above.
  • the shrinkage during sintering is less than 0.2%
  • the hardness HV3 after sintering is between 550 and 600 and after heat treatment between 650 and 750.
  • the bending strength is between 850 and 900 N / mm 2 lower than for the previously described mixtures.
  • the iron-silicon-phosphorus alloy mentioned is described in more detail in DE-PS 27 08 916.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

Des alliages frittables à base d'aciers rapides peuvent servir pour fabriquer des pièces d'usure perdue dans le domaine de la construction de machines et de véhicules. Les alliages frittables comprennent un mélange d'un acier rapide en poudre et d'une poudre de fer pur ou faiblement allié. Alors que les aciers rapides en poudre forment des phases liquides pendant le frittage, les composantes du mélange peuvent provenir aussi bien du groupe d'alliages de fer ne formant pas de phase liquide que du groupe d'alliages de fer formant des phases liquides. Bien qu'il ne soit pas possible de fritter ces alliages jusqu'à la même densité que les aciers rapides, ce qui fait qu'ils n'atteignent pas tout à fait les valeurs de résistance de ces derniers, dans les cas où il n'est pas important d'atteindre ces valeurs limites de résistance, ces alliages présentent un avantage déterminant: ils peuvent être frittés dans des fours normaux à atmosphère contrôlée sans une constance extrême de température, sans s'étirer, et présentent en outre un retrait minime. Un exemple particulièrement éprouvé est le mélange de 65% en masse d'acier rapide S 6.5.2 et de 35% en masse d'une poudre de fer allié à du phosphore contenant 0.45% P et 2% Si.
EP86904075A 1985-06-29 1986-06-07 Alliages frittables a base d'aciers rapides Pending EP0226625A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3523398 1985-06-29
DE19853523398 DE3523398A1 (de) 1985-06-29 1985-06-29 Sinterlegierungen auf der basis von schnellarbeitsstaehlen

Publications (1)

Publication Number Publication Date
EP0226625A1 true EP0226625A1 (fr) 1987-07-01

Family

ID=6274604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86904075A Pending EP0226625A1 (fr) 1985-06-29 1986-06-07 Alliages frittables a base d'aciers rapides

Country Status (7)

Country Link
US (1) US4755222A (fr)
EP (1) EP0226625A1 (fr)
JP (1) JPS63500107A (fr)
DE (1) DE3523398A1 (fr)
GB (1) GB2188062B (fr)
IT (1) IT1204419B (fr)
WO (1) WO1987000207A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8723818D0 (en) * 1987-10-10 1987-11-11 Brico Eng Sintered materials
EP0500089B1 (fr) * 1991-02-21 1996-08-14 Tosoh Corporation Dispositif d'éclairage par l'arrière
JP3520093B2 (ja) * 1991-02-27 2004-04-19 本田技研工業株式会社 二次硬化型高温耐摩耗性焼結合金
US5108493A (en) * 1991-05-03 1992-04-28 Hoeganaes Corporation Steel powder admixture having distinct prealloyed powder of iron alloys
US5346529A (en) * 1992-03-23 1994-09-13 Tecsyn Pmp, Inc. Powdered metal mixture composition
FR2698808B1 (fr) * 1992-12-07 1995-01-20 Renault Matériau pour pièces de friction opérant en milieu lubrifié, et son procédé d'obtention.
WO2001049437A2 (fr) * 2000-01-06 2001-07-12 Bleistahl-Produktions Gmbh & Co. Kg Piece moulee frittee produite par metallurgie des poudres
AU3368201A (en) * 2000-01-06 2001-07-16 Bleistahl-Produktions Gmbh And Co. Kg Powder metallurgy produced press-sinter shaped part

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352316A (en) * 1941-08-09 1944-06-27 American Electro Metal Corp Method of producing shaped bodies from powdery ferrous material
FR968551A (fr) * 1948-06-30 1950-11-30 Boehler & Co Ag Geb Procédé pour la fabrication d'outils en acier à partie active en acier rapide
DE864563C (de) * 1951-03-20 1953-01-26 Mannesmann Ag Herstellung von mit Aluminium oder Silizium legiertem, kugeligem Eisenpulver durch Zerstaeuben einer Schmelze
DE1298290B (de) * 1966-08-04 1969-06-26 Mannesmann Ag Phosphorhaltiges Eisenpulver fuer die Herstellung von Sinterteilen
JPS4990611A (fr) * 1972-12-29 1974-08-29
AT357185B (de) * 1974-09-19 1980-06-25 Elektrometallurgie Gmbh Vorlegiertes pulver zur herstellung von sinterstahlwerkstuecken
JPS5141082A (ja) * 1974-10-05 1976-04-06 Hitachi Shipbuilding Eng Co Jugososochi
IT1052293B (it) * 1974-11-30 1981-06-20 Krebsoege Gmbh Sintermetall Procedimento per la produzione di pezzi omogenei sinterizzati di acciaio legati con manganese
DE2708916C2 (de) * 1977-03-02 1985-07-18 Robert Bosch Gmbh, 7000 Stuttgart Verwendung einer hochfesten Eisen-Sinterlegierung
JPS6030427B2 (ja) * 1980-08-22 1985-07-16 大阪曹達株式会社 耐熱水方法
JPS57181367A (en) * 1981-04-08 1982-11-08 Furukawa Electric Co Ltd:The Sintered high-v high-speed steel and its production
SE440753B (sv) * 1983-05-13 1985-08-19 Santrade Ltd Verktyg for skerande bearbetning bestaende av kerna och holje
JPS59226101A (ja) * 1983-06-02 1984-12-19 Kawasaki Steel Corp スズ含有鉄系粉末およびその製造方法ならびにその使用方法
SE446277B (sv) * 1985-01-16 1986-08-25 Kloster Speedsteel Ab Vanadinhaltigt verktygsstal framstellt av metallpulver och sett vid dess framstellning

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8700207A1 *

Also Published As

Publication number Publication date
IT1204419B (it) 1989-03-01
DE3523398A1 (de) 1987-01-08
GB2188062B (en) 1989-01-11
IT8620940A0 (it) 1986-06-27
GB2188062A (en) 1987-09-23
JPS63500107A (ja) 1988-01-14
GB8703461D0 (en) 1987-03-18
WO1987000207A1 (fr) 1987-01-15
US4755222A (en) 1988-07-05

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Inventor name: HEINZE, BARBARA