EP1129803B1 - Matériau préparé par métallurgie des poudres avec isotropie améliorée des propriétés mécaniques - Google Patents

Matériau préparé par métallurgie des poudres avec isotropie améliorée des propriétés mécaniques Download PDF

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Publication number
EP1129803B1
EP1129803B1 EP01890047A EP01890047A EP1129803B1 EP 1129803 B1 EP1129803 B1 EP 1129803B1 EP 01890047 A EP01890047 A EP 01890047A EP 01890047 A EP01890047 A EP 01890047A EP 1129803 B1 EP1129803 B1 EP 1129803B1
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EP
European Patent Office
Prior art keywords
powder
deformation
capsule
subjected
flat
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
EP01890047A
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German (de)
English (en)
Other versions
EP1129803A2 (fr
EP1129803A3 (fr
Inventor
Siegfried Dipl.-Ing. Wilmes
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.)
Voestalpine Edelstahl GmbH
Original Assignee
Voestalpine Edelstahl GmbH
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Publication date
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Priority to EP06025501A priority Critical patent/EP1779947A1/fr
Publication of EP1129803A2 publication Critical patent/EP1129803A2/fr
Publication of EP1129803A3 publication Critical patent/EP1129803A3/fr
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Publication of EP1129803B1 publication Critical patent/EP1129803B1/fr
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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
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 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
    • B22F3/12—Both compacting and sintering
    • B22F3/16—Both compacting and sintering in successive or repeated steps
    • 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
    • B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/006—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of flat products, e.g. sheets
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the invention relates to a process for the powder metallurgical production of improved isotropy of the mechanical properties broadbread material from ledeburitic steel with rectangular or flachellipticianm cross-section, in particular starting material for the production of cutting, punching and forming tools, in which process with nitrogen atomized powder an alloy is placed in a capsule, compacted and optionally sealed after evacuation, followed by heating and isostatic pressing (HIP-en) of the powder capsule and the hot isostatically pressed blank thus prepared is subjected to deformation by forging and / or rolling.
  • HIP-en heating and isostatic pressing
  • coarse primary carbides and a carbide network may be present in cast condition ledeburitic tool steels conventionally produced by block casting.
  • these castings or blocks are subjected to hot working, the mechanical material properties are improved, but the extent of the improvement depends on the direction of stress. It is quite possible that by means of impact bending samples transverse to the direction of deformation only 25 to 30% of the impact bending working values are determined in comparison with those measured in the direction of deformation. This directional dependence of the toughness of the material can be explained by a pronounced carbide line structure, which can also be detected microscopically, in conventionally produced material.
  • Such a powder metallurgy produced starting material can be used undeformed or deformed to increase the mechanical properties.
  • microstructures with different etchings were found in comparison with the other areas of the primary material that support fiber theory.
  • the invention is now based on the object to provide methods of the type mentioned above, by means of which an improved isotropy of the mechanical properties, in particular an increase in the impact resistance and bending fracture toughness in the thickness direction of wide flat starting material of deformed PM workpieces is achieved.
  • the object is achieved according to the invention in that a blank having such a rectangular or flachelliptica cross-sectional shape is created and subjected to a deformation, that at this the difference between the deformation in the direction of the width and the deformation in the thickness direction of the cross section of the slurry flat material at most which is 2 times, preferably 1.5 times, the lower degree of deformation.
  • the above object is also achieved if the hot isostatically pressed blank is subjected in the direction of the longitudinal extension of a compression forming with at least twice the degree of compression, after which a Reckumformung the compressed blank takes place under formation of the wide-flat Vormaterials.
  • the hot isostatically pressed blank is subjected to a diffusion annealing treatment having a highest temperature of 20 ° C below the solidus temperature of the alloy and a minimum annealing time of 4 hours, after which it is stretched to a wide flat -Vorformed forged and / or rolled becomes.
  • the advantage of the method according to the invention is, in particular, to be seen in the fact that the effectiveness of the regions adversely influencing the toughness properties in the material is reduced.
  • the emergence of these areas is not yet scientifically clarified, also why these zones in the material adversely affect the mechanical properties, can not be interpreted with certainty, because in these areas or zones which are etched in a Schlifferprobung darker, there is a rather finer globulitic carbide structure ,
  • the blank is created with a cross-sectional shape that requires a difference in the degrees of deformation in the width and thickness direction of at most 2-fold in the subsequent forming, are in these directions slight deviations of the mechanical property before and it will be much higher Impact bending values achieved when these are given in a hot isostatically pressed, undeformed workpiece.
  • the hot isostatically pressed blank is subjected to compression forming at forging temperature, followed by so-called stretching or forging of the compressed forging, in which a wide-flat profile is created, then the values for the impact bending work of FIG Starting material in the transverse and in the thickness direction of the profile substantially the same height and are about 80% of those values, which are given in the longitudinal direction of the starting material.
  • the methods of the invention solve the problem of a substantial Anisotropy in powder metallurgy produced wide-flat materials, especially in ledeburitic steels of this cross-sectional shape, and increase more generally the quality of such manufactured products.
  • the advantage of the thus prepared starting material is essentially due to the fact that tools made therefrom are less notch sensitive and thereby endure significantly higher voltages and impact loads.
  • Warmpreßmatrizen were manufactured and tested in practical use.
  • the service life of the tool made of conventional material was extremely low, it was after 33 shock-like pressing a breaking off a projecting profile part, with no other wear or abrasion was noted.
  • the matrix of the same type prepared for the same product according to the invention produced by similar material deformations in the width and thickness direction wide-flat raw material yielded over 3000 pressings, after which the tool was eliminated because of abrasive wear.
  • 550mm square and 800 x 220mm semi-finished materials were produced by the HIP process, followed by direct deformation of a square and rectangular material into a rod cross-section of 550 x 100 mm.
  • Another square base material was annealed prior to deformation at a temperature of 38 ° C below the 43 ° C solidus temperature of the alloy as determined in the hot stage microscope.
  • a hot isostatically pressed undeformed material was provided.
  • test values T-S and T-L as well as S-T and S-L lie throughout in the same scattering range, so that in FIG. 2 to FIG. 5 only one variable or one value is taken into account.
  • the following also mean: ST u the toughness of the hipped undeformed sample in the thickness direction and ST k the toughness of a conventionally produced wide-flat starting material in the thickness direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Forging (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (3)

  1. Procédé de production par métallurgie des poudres de matériau large plat en acier lédeburitique de section rectangulaire ou elliptique aplatie, présentant une isotropie améliorée de ses propriétés mécaniques, en particulier de matériau de départ pour la fabrication d'outils de découpe, de poinçonnage et de formage, procédé dans lequel de la poudre d'un alliage atomisée par de l'azote est introduite dans une casette et compactée et la casette, le cas échéant après y avoir fait le vide, est fermée, après quoi on chauffe la casette de poudre et on effectue une compression isostatique à chaud (HIP) puis on soumet l'ébauche ainsi produite par compression isostatique à chaud à un formage par forgeage et/ou laminage, caractérisé en ce que l'on produit une ébauche ayant une forme de section rectangulaire ou elliptique aplatie et on la soumet à un reformage et en ce que, lors de ce reformage, la différence entre la déformation dans le sens de la largeur et la déformation dans le sens de l'épaisseur de la section du matériau large plat est au maximum égale à 2 fois, de préférence au maximum égale à 1,5 fois le degré de déformation le plus faible.
  2. Procédé de production par métallurgie des poudres de matériau large plat en acier lédeburitique de section rectangulaire ou elliptique aplatie, présentant une isotropie améliorée de ses propriétés mécaniques, en particulier de matériau de départ pour la fabrication d'outils de découpe et de poinçonnage, procédé dans lequel de la poudre d'un alliage atomisée par de l'azote est introduite dans une casette et compactée et la casette, le cas échéant après y avoir fait le vide, est fermée, après quoi on chauffe la casette de poudre et on effectue une compression isostatique à chaud (HIP) puis on soumet l'ébauche ainsi produite par compression isostatique à chaud à un formage par forgeage et/ou laminage, caractérisé en ce que l'ébauche produite par compression isostatique à chaud est soumise dans le sens de son extension longitudinale à une déformation par refoulement avec un degré de refoulement au moins égal à deux fois, après quoi on effectue une déformation par étirage de l'ébauche refoulée afin de former le matériau de départ large plat.
  3. Procédé de production par métallurgie des poudres de matériau large plat en acier lédeburitique de section rectangulaire ou elliptique aplatie, présentant une isotropie améliorée de ses propriétés mécaniques, en particulier de matériau de départ pour la fabrication d'outils de découpe et de poinçonnage, procédé dans lequel de la poudre d'un alliage atomisée par de l'azote est introduite dans une casette et compactée et la casette, le cas échéant après y avoir fait le vide, est fermée, après quoi on chauffe la casette de poudre et on effectue une compression isostatique à chaud (HIP) puis on soumet l'ébauche ainsi produite par compression isostatique à chaud à un formage par forgeage et/ou laminage, caractérisé en ce que l'ébauche produite par compression isostatique à chaud est soumise à un recuit d'homogénéisation à une température maximale inférieure de 20°C à la température de solidus de l'alliage et pendant une durée de recuit minimale de 4 heures, après quoi elle est forgée et/ou laminée afin de la déformer par étirage en un matériau de départ large plat.
EP01890047A 2000-03-03 2001-02-23 Matériau préparé par métallurgie des poudres avec isotropie améliorée des propriétés mécaniques Expired - Lifetime EP1129803B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06025501A EP1779947A1 (fr) 2000-03-03 2001-02-23 Matériau préparé par métallurgie des poudres avec isotropie améliorée des propriétés mécaniques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0034900A AT409831B (de) 2000-03-03 2000-03-03 Verfahren zur pulvermetallurgischen herstellung von vormaterial und vormaterial
AT3492000 2000-03-03

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP06025501A Division EP1779947A1 (fr) 2000-03-03 2001-02-23 Matériau préparé par métallurgie des poudres avec isotropie améliorée des propriétés mécaniques

Publications (3)

Publication Number Publication Date
EP1129803A2 EP1129803A2 (fr) 2001-09-05
EP1129803A3 EP1129803A3 (fr) 2001-10-04
EP1129803B1 true EP1129803B1 (fr) 2006-12-20

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Family Applications (2)

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EP06025501A Ceased EP1779947A1 (fr) 2000-03-03 2001-02-23 Matériau préparé par métallurgie des poudres avec isotropie améliorée des propriétés mécaniques
EP01890047A Expired - Lifetime EP1129803B1 (fr) 2000-03-03 2001-02-23 Matériau préparé par métallurgie des poudres avec isotropie améliorée des propriétés mécaniques

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP06025501A Ceased EP1779947A1 (fr) 2000-03-03 2001-02-23 Matériau préparé par métallurgie des poudres avec isotropie améliorée des propriétés mécaniques

Country Status (8)

Country Link
US (1) US6630102B2 (fr)
EP (2) EP1779947A1 (fr)
JP (2) JP2001316706A (fr)
AT (2) AT409831B (fr)
DE (1) DE50111660D1 (fr)
DK (1) DK1129803T3 (fr)
ES (1) ES2275645T3 (fr)
PT (1) PT1129803E (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10340133B3 (de) * 2003-08-28 2005-02-03 Eads Deutschland Gmbh Verfahren zum Reduzieren von Oberflächenoxiden auf metallischen Pulverpartikeln während des Sinterns daraus hergestellter Pulverkörper
US8778259B2 (en) 2011-05-25 2014-07-15 Gerhard B. Beckmann Self-renewing cutting surface, tool and method for making same using powder metallurgy and densification techniques
EP2662166A1 (fr) * 2012-05-08 2013-11-13 Böhler Edelstahl GmbH & Co KG Matière première avec grande résistance à l'usure
RU2504455C1 (ru) * 2012-11-01 2014-01-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Уфимский государственный авиационный технический университет" Способ получения заготовок из порошковых металлических материалов

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE279428C (fr)
US4121927A (en) * 1974-03-25 1978-10-24 Amsted Industries Incorporated Method of producing high carbon hard alloys
US3966422A (en) * 1974-05-17 1976-06-29 Cabot Corporation Powder metallurgically produced alloy sheet
US4479833A (en) * 1981-06-26 1984-10-30 Bbc Brown, Boveri & Company, Limited Process for manufacturing a semi-finished product or a finished component from a metallic material by hot working
SE451549B (sv) * 1983-05-09 1987-10-19 Kloster Speedsteel Ab Pulvermetallurgisk metod att framstella metallkroppar av magnetiserbart sferiskt pulver
DE3530741C1 (de) * 1985-08-28 1993-01-14 Avesta Nyby Powder AB, Torshälla Verfahren zur Herstellung pulvermetallurgischer Gegenstaende
CH673241A5 (fr) * 1986-08-12 1990-02-28 Bbc Brown Boveri & Cie
DD279428A1 (de) * 1989-01-16 1990-06-06 Freiberg Bergakademie Verfahren zur pulvermetallurgischen herstellung von halbzeug aus schnellarbeitsstahl
US5201966A (en) * 1989-08-31 1993-04-13 Hitachi Powdered Metals, Co., Ltd. Method for making cylindrical, iron-based sintered slugs of specified porosity for subsequent plastic deformation processing
AT395230B (de) * 1989-11-16 1992-10-27 Boehler Gmbh Verfahren zur herstellung von vormaterial fuer werkstuecke mit hohem anteil an metallverbindungen
JPH0474804A (ja) * 1990-07-16 1992-03-10 Mitsubishi Heavy Ind Ltd 高温域硬化粉体材からの角材製造方法
JPH0533012A (ja) * 1991-07-24 1993-02-09 Sumitomo Metal Ind Ltd 面内異方性の小さい分散強化型鋼の加工法
JPH09194905A (ja) * 1996-01-16 1997-07-29 Mitsubishi Heavy Ind Ltd 切削工具等の製造方法
JPH09310108A (ja) * 1996-05-16 1997-12-02 Daido Steel Co Ltd ダイス用ブランクの製造方法及びダイス用ブランク
US5830287A (en) * 1997-04-09 1998-11-03 Crucible Materials Corporation Wear resistant, powder metallurgy cold work tool steel articles having high impact toughness and a method for producing the same

Also Published As

Publication number Publication date
DE50111660D1 (de) 2007-02-01
EP1779947A1 (fr) 2007-05-02
PT1129803E (pt) 2007-03-30
EP1129803A2 (fr) 2001-09-05
DK1129803T3 (da) 2007-04-30
US20010022945A1 (en) 2001-09-20
AT409831B (de) 2002-11-25
ATA3492000A (de) 2002-04-15
ES2275645T3 (es) 2007-06-16
EP1129803A3 (fr) 2001-10-04
JP2010047840A (ja) 2010-03-04
ATE348673T1 (de) 2007-01-15
JP2001316706A (ja) 2001-11-16
US6630102B2 (en) 2003-10-07

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