EP0433264A2 - Method for the production of preformed material for workpieces comprising a large proportion of metal compounds - Google Patents

Method for the production of preformed material for workpieces comprising a large proportion of metal compounds Download PDF

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Publication number
EP0433264A2
EP0433264A2 EP90890293A EP90890293A EP0433264A2 EP 0433264 A2 EP0433264 A2 EP 0433264A2 EP 90890293 A EP90890293 A EP 90890293A EP 90890293 A EP90890293 A EP 90890293A EP 0433264 A2 EP0433264 A2 EP 0433264A2
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EP
European Patent Office
Prior art keywords
powder
metal
spray stream
melt
particles
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.)
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Application number
EP90890293A
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German (de)
French (fr)
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EP0433264A3 (en
Inventor
Bruno Dipl. -Ing. Hribernik
Gerhard Dipl.-Ing. Hackl
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Boehler GmbH
Boehler GmbH Germany
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Boehler GmbH
Boehler GmbH Germany
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Publication of EP0433264A2 publication Critical patent/EP0433264A2/en
Publication of EP0433264A3 publication Critical patent/EP0433264A3/en
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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%
    • C22C33/0292—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% with more than 5% preformed carbides, nitrides or borides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C22C1/1042—Alloys containing non-metals starting from a melt by atomising
    • 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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/123—Spraying molten metal
    • 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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment

Definitions

  • the invention relates to a method for producing starting material according to the preamble of claim 1.
  • Coarse and excreted compounds deteriorate according to the interdendritic residual solidification Crucial is the hot deformability of the material and the mechanical properties of workpieces made from it, in particular tools and tool parts, so that there are considerable difficulties in hot forming and hardening as well as high risk of breakage during use.
  • the object of the invention was to create a starting material of the type mentioned at the outset which is readily thermoformable, has a high proportion of metal compounds with a small grain diameter, can be easily hardened and the workpieces made therefrom have good mechanical properties, especially high toughness.
  • the rest of the iron and melting-related impurities were broken down into liquid individual particles with nitrogen after emerging from a melt container and a metal spray stream was formed.
  • a powder with a grain size of 14 to 28 ⁇ m and with a composition of in% by weight was introduced into this metal spray stream.
  • the rest of the production-related impurities are introduced, applied to the surface in several layers with the liquid individual particles and allowed to solidify.
  • the ratio of the weight of liquid individual particles to powder was approximately 1: 0.4.
  • the body obtained on the base by relative movement of the powder / metal spray stream had a total thickness of 110 mm and was thermoformed with an 8.5-fold deformation by forging into a starting material for tools.
  • a tool made from the primary material for machining castings had a proportion of 31% by volume of niobium carbide after the heat treatment, the maximum carbide grain size being 12 ⁇ m.
  • the niobium carbide (NbC) grains with a melting point of approx. 3600 ° C were largely homogeneously distributed in the high-speed steel matrix.
  • a hardness of 65 HRC and a flexural strength of 3600 MPa were determined on the tool as material values, the service life in practical use was 3.6 times as high in comparison with a similar tool made of a steel DIN material No. 1.3343.

Abstract

The invention relates to a process for the production of preformed material for workpieces, preferably tools, in particular of high-speed steel, having a high proportion of metal compounds. To achieve good hot workability in conjunction with a high proportion of metal compounds in the material and to improve the hardenability of the workpieces produced therefrom and having good mechanical properties, the process is characterised by the division of a liquid melt into individual particles and the formation of a metal spray stream into which powder consisting of high-melting metal compounds and/or containing said compounds is passed and is applied with the individual particles to a substrate and allowed to solidify, and the body obtained is subjected to hot isostatic pressing and/or hot working.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Vormaterial nach dem Oberbegriff des Anspruchs 1.The invention relates to a method for producing starting material according to the preamble of claim 1.

Bei den bekannten schmelzmetallurgischen Verfahren der genannten Gattung ist der in einer Matrix einlagerbare Anteil an Metallverbindungen, zum Beispiel Karbide, Nitride, Karbonitride und/oder Boride, auf Grund der Bildungsmechanismen vor und während der Erstarrung einer Schmelze begrenzt, weil die Eigenschaften desIn the known melt metallurgical processes of the type mentioned, the proportion of metal compounds that can be incorporated in a matrix, for example carbides, nitrides, carbonitrides and / or borides, is limited due to the formation mechanisms before and during the solidification of a melt, because the properties of the

Werkstoffes, insbesondere die Warmverformbarkeit und die Zähigkeit mit steigendem Anteil an Metallverbindungen stark verschlechert werden. Eine einen bestimmten Wert überschreitende Konzentration von obige Verbindungen bildenden Elementen, insbesondere solchen der IV., V. und VI. Gruppe des Periodensystems, führt bei Vorhandensein von Kohlenstoff und/oder Stickstoff und/oder Bor in der Schmelze zu primären Ausscheidungen. Diese Ausscheidungen können als Erstausscheidungen aus der homogenen Schmelze und/oder als interdendritische Ausscheidungen aus der Restschmelze entstehen und sind auf Grund eines weitgehend ungehinderten Wachstums grob und/oder strukturiert ausgebildet. Beispielsweise können sich aus einer einen Kohlenstoffgehalt von 1 Gew.-% aufweisenden Schmelze bei einer Niobkonzentration von größer als ca. 2,5 Gew.-% primäre grobe Niobkarbide mit einem Durchmesser von größer als 50 µm ausscheiden.Material, especially the hot formability and toughness with increasing proportion of metal compounds are greatly deteriorated. A concentration of elements forming the above compounds, in particular those of IV., V. and VI. Group of the periodic table, leads to primary excretion in the presence of carbon and / or nitrogen and / or boron in the melt. These precipitates can arise as initial precipitates from the homogeneous melt and / or as interdendritic precipitates from the residual melt and are rough and / or structured due to largely unimpeded growth. For example, primary coarse niobium carbides with a diameter of greater than 50 μm can separate out from a melt having a carbon content of 1% by weight and a niobium concentration of greater than approximately 2.5% by weight.

Grobe und entsprechend der interdendritischen Resterstarrung strukturiert ausgeschiedene Verbindungen verschlechtern entscheidend die Warmverformbarkeit des Materials und die mechanischen Eigenschaften von daraus hergestellten Werkstücken, insbeondere von Werkzeugen und Werkzeugteilen, sodaß erhebliche Schwierigkeiten bei der Warmumformung und Härtung sowie hohe Bruchgefahr bei der Verwendung gegeben sind.Coarse and excreted compounds deteriorate according to the interdendritic residual solidification Crucial is the hot deformability of the material and the mechanical properties of workpieces made from it, in particular tools and tool parts, so that there are considerable difficulties in hot forming and hardening as well as high risk of breakage during use.

Um in eine Matrix höhere Anteile von Metallverbindungen bei Verminderung der nachteiligen Wirkung einbringen zu können, wurden pulvermetallurgische Herstellverfahren vorgeschlagen. Mit derartigen Verfahren gelingt es zwar, die Anisotropie im Werkstück zu vermeiden und die Korngröße der Metallverbindungen wesentlich zu verkleinern, der Anteil an Metallverbindungen in der Matrix ist jedoch aus Gründen der Ausscheidungskinetik begrenzt. Werden nämlich höhere Konzentrationen von Metallverbindungen bildenden Elementen einer Schmelze zulegiert, so entstehen in dieser Erstaus­scheidungen, die auf Grund ihres freien Wachstums sehr grob dendritisch und/oder scharfkantig ausgebildet sind. Wird nun eine derartige Schmelze z.B. verdüst, so enthält auch das Pulver diese erstausgeschiedenen grobkörnigen Verbindungen, welche auch mit ihren, die Güte des Materials verschlechternden Wirkungen den aus einem derartigen Pulver hergestellten Werkstoff kennzeichnen.In order to be able to introduce higher proportions of metal compounds into a matrix while reducing the disadvantageous effect, powder metallurgical production processes have been proposed. With such methods, it is possible to avoid the anisotropy in the workpiece and to significantly reduce the grain size of the metal compounds, but the proportion of metal compounds in the matrix is limited for reasons of precipitation kinetics. If higher concentrations of metal compound-forming elements of a melt are alloyed in, then first precipitates are formed which, due to their free growth, are very roughly dendritic and / or sharp-edged. If such a melt is now e.g. atomized, the powder also contains these first-precipitated coarse-grained compounds, which also characterize the material produced from such a powder with their effects which impair the quality of the material.

Ausgehend von diesem Stand der Technik lag der Erfindung die Aufgabe zugrunde, ein Vormaterial der eingangs genannten Art zu schaffen, das gut warmverformbar ist, einen hohen Anteil an Metall­verbindungen mit kleinem Korndurchmesser aufweist, leicht gehärtet werden kann und die daraus gefertigten Werkstücke gute mechanische Eigenschaften, insbesondere hohe Zähigkeit, besitzen.On the basis of this prior art, the object of the invention was to create a starting material of the type mentioned at the outset which is readily thermoformable, has a high proportion of metal compounds with a small grain diameter, can be easily hardened and the workpieces made therefrom have good mechanical properties, especially high toughness.

Diese Aufgabe ist gemäß der Erfindung durch die im Patentanspruch 1 genannten Merkmale gelöst.This object is achieved according to the invention by the features mentioned in claim 1.

Es war durchaus überraschend, daß es gelingt, hochschmelzende Metallverbindungen, die in den Sprühstrom eingeleitet werden, mit den flüssigen Partikeln auf eine Unterlage aufzubringen, und daß nach dem Erstarren und heißisostatischen Pressen und/oder Verformen ein Vormaterial für die Werkstücke hergestellt werden kann, welches trotz hohen Anteils an Metallverbindungen gute mechanische Eigenschaften, insbesondere hohe Zähigkeit, aufweist. Dabei ist die Korngröße der erstarrten Matrix weitgehend unwesentlich, wenn die Konzentration von Metallverbindungen bildenden Elementen in der Schmelze niedrig ist und somit keine groben Ausscheidungen bei der Erstarrung gebildet werden. Der Fachmann mußte erwarten, daß schon beim Einleiten des hochschmelzenden Pulvers in den Metallsprühstrom und beim Transport in Richtung zur Unterlage Schwierigkeiten entstehen, weil zumeist die Oberfläche des Metallverbindungen enthaltenden oder aus diesen gebildeten Pulverkornes schlecht benetzbar ist. Weiters mußte der Fachmann annehmen, daß auch auf Grund eines Unterschiedes im spezifischen Gewicht zwischen Schmelze und Pulver eine Schwerkraft­seigerung entsteht, welche zu einer extremen Inhomogenität des auf der Unterlage erstarrten Körpers führt. Bei Überwindung dieses Vorurteils wurde gefunden, daß nach dem erfindungsgemäßen Verfahrens auch im aus mehreren Schichten aufgebauten Körper eine weitgehend homogene Verteilung von großen Anteilen von hochschmelzenden Metallverbindungen mit geringem Korndurchmesser erreicht werden kann, wobei die Korngröße der Matrix des auf die Unterlage aufgebrachten Körpers keinen wesentlichen Einfluß auf die Zähigkeit des hergestellten Werkstückes besitzt.It was quite surprising that it was possible to use high-melting metal compounds that are introduced into the spray stream to apply the liquid particles to a base, and that after solidification and hot isostatic pressing and / or shaping, a starting material for the workpieces can be produced which, despite the high proportion of metal compounds, has good mechanical properties, in particular high toughness. The grain size of the solidified matrix is largely insignificant if the concentration of elements forming metal compounds in the melt is low and thus no coarse precipitations are formed during solidification. The person skilled in the art had to expect that difficulties would arise when the high-melting powder was introduced into the metal spray stream and when it was being transported in the direction of the base, because the surface of the powder grain containing or formed from metal compounds was poorly wettable. Furthermore, the person skilled in the art had to assume that due to a difference in the specific weight between the melt and the powder, there is an increase in gravity, which leads to an extreme inhomogeneity of the solidified body on the base. In overcoming this prejudice, it was found that a largely homogeneous distribution of large proportions of high-melting metal compounds with a small grain diameter can be achieved by the process according to the invention, even in the body composed of several layers, the grain size of the matrix of the body applied to the base having no significant influence on the toughness of the workpiece produced.

Anhand eines Beispieles soll das erfindungsgemäße Vefahren zur Herstellung eines erfindungsgemäßen Gegenstandes näher erläutert werden.The method according to the invention for producing an object according to the invention will be explained in more detail using an example.

Eine Schmelze mit einer Zusammensetzung von in Gew.-%
C = 0,89
Si = 0,25
Mn = 0,26
Cr = 4,10
Mo = 4,90
V = 1,84
W = 6.20
Rest Eisen und erschmelzungsbedingte Verunreinigungen wurde nach dem Austreten aus einem Schmelzenbehälter mit Stickstoff in flüssige Einzelpartikel zerlegt und ein Metallsprühstrom gebildet. In diesen Metallsprühstrom wurde ein Pulver mit einer Korngröße von 14 bis 28 µm und mit einer Zusammensetzung von in Gew.-%
C = 8,5
Si = 1,8
Al = 0,4
Nb = 61
Fe = 28
Rest herstellungsbedingte Verunreinigungen eingeleitet, mit den flüssigen Einzelpartikeln in mehreren Schichten auf eine Unterlage aufgebracht und erstarren gelassen. Das Verhältnis des Gewichtes von flüssigen Einzelpartikeln zu Pulver betrug etwa 1 : 0,4. Der auf der Unterlage durch Relativbewegung des Pulver/Metallsprühstromes erhaltene Körper wies eine Gesamtdicke von 110 mm auf und wurde mit einer 8,5-fachen Verformung durch Schmieden zu einem Vormaterial für Werkzeuge warmverformt. Ein aus dem Vormaterial gefertigtes Werkzeug zur spanabhebenden Bearbeitung von Gußstücken wies nach der Wärmebehandlung einen Anteil von 31 Vol.-% Niobkarbid auf, wobei die maximale Karbidkorn­größe 12 µm betrug. Die Körner aus Niobkarbid (NbC) mit einem Schmelzpunkt von ca. 3600°C waren in der Schnellstahlmatrix weitgehend homogen verteilt. Als Werkstoffwerte wurden am Werkzeug eine Härte von 65 HRC und eine Biegebruchfestigkeit von 3600 MPa ermittelt, die Standzeit im praktischen Einsatz war im Vergleich mit einem gleichartigen Werkzeug aus einem Stahl DIN Werkstoff Nr. 1.3343 3,6-mal so hoch.A melt with a composition of in% by weight
C = 0.89
Si = 0.25
Mn = 0.26
Cr = 4.10
Mo = 4.90
V = 1.84
W = 6.20
The rest of the iron and melting-related impurities were broken down into liquid individual particles with nitrogen after emerging from a melt container and a metal spray stream was formed. A powder with a grain size of 14 to 28 μm and with a composition of in% by weight was introduced into this metal spray stream.
C = 8.5
Si = 1.8
Al = 0.4
Nb = 61
Fe = 28
The rest of the production-related impurities are introduced, applied to the surface in several layers with the liquid individual particles and allowed to solidify. The ratio of the weight of liquid individual particles to powder was approximately 1: 0.4. The body obtained on the base by relative movement of the powder / metal spray stream had a total thickness of 110 mm and was thermoformed with an 8.5-fold deformation by forging into a starting material for tools. A tool made from the primary material for machining castings had a proportion of 31% by volume of niobium carbide after the heat treatment, the maximum carbide grain size being 12 μm. The niobium carbide (NbC) grains with a melting point of approx. 3600 ° C were largely homogeneously distributed in the high-speed steel matrix. A hardness of 65 HRC and a flexural strength of 3600 MPa were determined on the tool as material values, the service life in practical use was 3.6 times as high in comparison with a similar tool made of a steel DIN material No. 1.3343.

Claims (7)

1. Verfahren zur Herstellung von Vormaterial für Werkstücke, vorzugsweise Werkzeuge, insbesondere aus Schnellarbeitsstahl mit hohem Anteil an Metallverbindungen, dadurch gekennzeichnet, daß eine flüssige Schmelze unmittelbar nach dem Austreten aus einer Öffnung in einem Schmelzenbehälter, auf an sich bekannte Weise, durch beispielsweise einen oder mehrere Gasstrom(ströme) in Einzelpartikel zerlegt und mit diesen Einzelpartikeln ein Metallsprühstrom gebildet wird, wobei in den Metallsprühstrom ein oder mehrere, aus Metallverbindung(en) , welche einen höheren Schmelzpunkt als die Schmelze aufweist, bestehendes(e), oder derartige Metallverbindung(en) enthaltendes(e) Pulver eingeleitet und die Pulverkörner von den flüssigen Partikeln in Richtung des Metallsprühstromes transportiert werden und die flüssigen Partikel mit den Pulverkörnern auf eine Unterlage, gegebenenfalls in mehreren Schichten, aufgebracht und unter Bildung eines hochschmelzende Verbindungen enthaltenden Körpers erstarren gelassen werden und dieser Körper heißisostatisch gepreßt und/oder warmverformt wird.1. A process for the production of starting material for workpieces, preferably tools, in particular from high-speed steel with a high proportion of metal compounds, characterized in that a liquid melt immediately after emerging from an opening in a melt container, in a known manner, for example by or Several gas streams (streams) are broken down into individual particles and a metal spray stream is formed with these individual particles, one or more metal compound (s), which has a higher melting point than the melt, existing, or such metal compound (s) in the metal spray stream ) containing (e) powder introduced and the powder particles are transported by the liquid particles in the direction of the metal spray stream and the liquid particles with the powder particles are applied to a base, optionally in several layers, and to form a body containing high-melting compounds be solidified and this body is hot isostatically pressed and / or thermoformed. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet,daß durch den (die) Gasstrom(ströme) flüssige Partikel mit einem Durchmesser von 5 bis 250 µm, insbesondere von höchstens 80 µm, gebildet werden und daß in den Metallsprühstrom zumindest ein aus einer hochschmelzenden Metallverbindung bestehendes und/oder mindestens eine derartige Verbindung enthaltendes Pulver mit einem Korndurchmesser von 5 bis 50 µm, vorzugsweise von 10 bis 30 µm, insbesondere von 15 bis 30 µm, eingeleitet wird (werden).2. The method according to claim 1, characterized in that by the gas stream (s) liquid particles with a diameter of 5 to 250 microns, in particular of at most 80 microns, are formed and that in the metal spray stream at least one of a high-melting metal compound existing powder and / or powder containing at least one such compound with a grain diameter of 5 to 50 µm, preferably 10 to 30 µm, in particular 15 to 30 µm, is (are) introduced. 3. Verfahren nach Anspruch 1 oder, 2, dadurch gekennzeichnet, daß ein karbidhaltiges und/oder nitridhaltiges und/oder boridhaltiges und/oder Karlid-und/oder Nitrid- und/oder Borid-Pulver in den Metallsprühstrom eingeleitet wird (werden).3. The method according to claim 1 or, 2, characterized in that a carbide-containing and / or nitride-containing and / or boride-containing and / or karlide and / or nitride and / or boride powder is (are) introduced into the metal spray stream. 4. Verfahren nach einem der Ansprüche 1 bis 3,dadurch gekennzeichnet, daß das (die) Pulver Karbide und/oder Nitride der Elemente der IV., V. oder VI. Gruppe des Periodensystems enthält (enthalten) oder daraus gebildet ist (sind).4. The method according to any one of claims 1 to 3, characterized in that the powder (s) carbides and / or nitrides of the elements of IV., V. or VI. Group of the periodic table contains (is) or is formed from it. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß in den Metallsprühstrom ein Pulver eingeleitet wird, welches im wesentlichen die Elemente Niob, Eisen und Kohlenstoff, herstellungsbedingte Verunreinigungen als Rest enthält und vorzugsweise eine Konzentration in Gew.-% von
Nb = 50 bis 70
Fe = 20 bis 40
C = 8 bis 15
aufweist.5. The method according to any one of claims 1 to 4, characterized in that a powder is introduced into the metal spray stream, which essentially contains the elements niobium, iron and carbon, production-related impurities as the rest and preferably a concentration in wt .-% of
Nb = 50 to 70
Fe = 20 to 40
C = 8 to 15
having. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Schmelze bzw. die flüssigen Partikel aus einer Legierung einer Zusammensetzung in Gew.-% von
C = 0,8 bis 3,0
Cr = 3,5 bis 14
Mn = 0,15 bis 4,0
Ni = max. 4,0
W = bis 22,0
Mo = bis 12,0
(W+2Mo)= 1,0 bis 24,0
V = 0,4 bis 6,0
Nb = max. 3,0
Co = bis 14,0
Rest Eisen und erschmelzungsbedingten Verunreinigungen gebildet wird(werden).6. The method according to any one of claims 1 to 5, characterized in that the melt or the liquid particles of an alloy of a composition in wt .-% of
C = 0.8 to 3.0
Cr = 3.5 to 14
Mn = 0.15 to 4.0
Ni = max. 4.0
W = up to 22.0
Mo = up to 12.0
(W + 2Mo) = 1.0 to 24.0
V = 0.4 to 6.0
Nb = max. 3.0
Co = up to 14.0
Remainder iron and melting-related impurities are formed. 7. Gegenstand hergestellt nach einem Verfahren gemäß einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß dessen Anteil an Metallverbindung(en) größer als 15 Vol.-%, vorzugsweise großer als 20 Vol.-%, insbesondere größer als 30 Vol.-%, und der Korndurchmesser dieser Verbindungen wie Karbide und/oder Nitride und/oder Boride kleiner als 30/µm ist.7. An article produced by a process according to one of claims 1 to 6, characterized in that its proportion of metal compound (s) is greater than 15% by volume, preferably greater than 20% by volume, in particular greater than 30% by volume. %, and the grain diameter of these compounds such as carbides and / or nitrides and / or borides is less than 30 / µm.
EP19900890293 1989-11-16 1990-11-05 Method for the production of preformed material for workpieces comprising a large proportion of metal compounds Withdrawn EP0433264A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0261789A AT395230B (en) 1989-11-16 1989-11-16 METHOD FOR PRODUCING PRE-MATERIAL FOR WORKPIECES WITH A HIGH PROPORTION OF METAL CONNECTIONS
AT2617/89 1989-11-16

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EP0433264A2 true EP0433264A2 (en) 1991-06-19
EP0433264A3 EP0433264A3 (en) 1991-08-28

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US6334884B1 (en) 1999-01-19 2002-01-01 Bohler Edelstahl Gmbh & Co Kg Process and device for producing metal powder
AT409831B (en) * 2000-03-03 2002-11-25 Boehler Uddeholm Ag METHOD FOR THE POWDER METALLURGICAL PRODUCTION OF PRE-MATERIAL AND PRE-MATERIAL
AT411580B (en) * 2001-04-11 2004-03-25 Boehler Edelstahl METHOD FOR THE POWDER METALLURGICAL PRODUCTION OF OBJECTS

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