EP0130177A1 - Alliage ferreux fritté - Google Patents

Alliage ferreux fritté Download PDF

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Publication number
EP0130177A1
EP0130177A1 EP84890116A EP84890116A EP0130177A1 EP 0130177 A1 EP0130177 A1 EP 0130177A1 EP 84890116 A EP84890116 A EP 84890116A EP 84890116 A EP84890116 A EP 84890116A EP 0130177 A1 EP0130177 A1 EP 0130177A1
Authority
EP
European Patent Office
Prior art keywords
alloy
carbon
niobium
chromium
iron
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
EP84890116A
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German (de)
English (en)
Other versions
EP0130177B1 (fr
Inventor
Alfred Dr. Kulmburg
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.)
Vereinigte Edelstahlwerke AG
Original Assignee
Vereinigte Edelstahlwerke 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 Vereinigte Edelstahlwerke AG filed Critical Vereinigte Edelstahlwerke AG
Publication of EP0130177A1 publication Critical patent/EP0130177A1/fr
Application granted granted Critical
Publication of EP0130177B1 publication Critical patent/EP0130177B1/fr
Expired 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
    • C22C33/0278—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%
    • C22C33/0285—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 Cr, Co, or Ni having a minimum content higher than 5%

Definitions

  • the present invention relates to an iron-based sintered alloy, especially for cold work tools.
  • a sintered alloy for internal combustion engines which, in addition to carbon, chromium, niobium, molybdenum and nickel, has a minimum content of 0.1% by weight of phosphorus, whereby liquid phase sintering at temperatures below 1250 ° C. is achieved shall be.
  • Such an alloy is provided for valve seats, piston rings and the like.
  • Ledeburitic steels with 12% chromium and a carbon content of around 3% have a particularly high carbide content of around 30% by volume. A hardness of approx. 66 to 70 HRc can be achieved with this. These steels are characterized by high hardenability and excellent wear resistance as well as small dimensional changes during hardening. The mechanical strength and the hot formability are relatively low. In order to increase the hot formability, it has already been proposed to remodel such alloys using the electroslag remelting process melt. Thus, a slight increase, although the mechanical strength can be achieved, while at the same arnverformbarkeit to an improvement in the W to approximately twice the value.
  • the object of the present invention is now to provide an iron-based sintered alloy which has an increased carbide content, has increased mechanical strength values compared to a corresponding alloy obtained by melt metallurgy and which has a longer service life due to the increased carbide content , and which has a high thermoformability based on the carbide content.
  • An additional content of 0.4 to 0.7% by weight of manganese also improves the sinterability of the alloy.
  • the alloy can additionally have a content of 0.05 to 2.0% by weight of tantalum.
  • the alloy has a content of between 0.02 and 2.0% by weight of boron, it is completely surprising that the hot-formability is fully retained, and at the same time the service life can be increased via the boride content.
  • the alloys listed in Table 1 were produced by melt metallurgy, part of the melt being poured off directly, and another part being kept in a nitrogen atomization process to obtain the desired powder. This powder was processed by hot isostatic pressing at a temperature of approximately 1050 ° C. at 1000 bar and an exposure time of 3 hours. Samples were produced from the compacts or cast blocks thus obtained, which were then subjected to the tests were thrown. In order to determine the rotational speed at 1100 ° C., the samples were heated to 1100 ° C. and kept at this temperature for 15 minutes and then rotated in a warm torsion device until they broke. To determine the bending strength ( bB ) the sample was adjusted to a hardness of 63 HRc by tempering.
  • Table 2 compares the hardness, the flexural strength and the number of twists to break at 1100 ° C. of the cast samples with those obtained by sintered metallurgy. This comparison shows, on the one hand, that the hardness values of the alloys obtained by sinter metallurgy are the same or slightly higher than the comparative alloy. In contrast, the flexural strength of the powder metallurgical alloys is in any case higher. The speed of rotation of sintered metallurgical alloys is significantly higher than that of cast samples.
  • Alloy 2 has good hot formability despite the increased carbon content.
  • tantalum does not impair the strength and a corresponding deformability is still maintained.
  • the increased tantalum and niobium contents show a reduction in the bending strength and the deformability, which is directly attributable to the increased proportion of carbides.
  • wear resistance I increases wear resistance
  • niobium increases the wear resistance, whereby both the flexural strength and the warm torsion resistance are reduced.
  • alloys 8 and 10 the hot formability of the casting alloys is exceptional Lich bad, whereas this has been preserved with the powder metallurgical alloy.
  • Silicon increases the strength, as can be seen from the values for alloys 9 and 10.
  • the properties of alloy 11 essentially correspond to those of alloy 7, the addition of manganese increasing the sinterability. Due to the high carbon content of alloy 12, the cast alloy has extremely low values, whereas the powder metallurgical values still correspond.
  • the statements for alloy 13 correspond to those for alloy 12. Alloy 14 has a higher strength due to the increased silicon content, the deformability still being fully given.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
EP19840890116 1983-06-23 1984-06-20 Alliage ferreux fritté Expired EP0130177B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0231683A AT383619B (de) 1983-06-23 1983-06-23 Sinterlegierung auf eisenbasis
AT2316/83 1983-06-23

Publications (2)

Publication Number Publication Date
EP0130177A1 true EP0130177A1 (fr) 1985-01-02
EP0130177B1 EP0130177B1 (fr) 1986-12-03

Family

ID=3532106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840890116 Expired EP0130177B1 (fr) 1983-06-23 1984-06-20 Alliage ferreux fritté

Country Status (3)

Country Link
EP (1) EP0130177B1 (fr)
AT (1) AT383619B (fr)
DE (1) DE3461548D1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0322397A2 (fr) * 1987-12-23 1989-06-28 BÖHLER Gesellschaft m.b.H. Acier à coupe rapide préparé par la métallurgie des poudres, objet résistant à l'usure et procédé de préparation de cet acier
WO1996028580A1 (fr) * 1995-03-10 1996-09-19 Powdrex Limited Poudres d'acier inoxydable et articles produits a l'aide de celles-ci par metallurgie des poudres
US20130186237A1 (en) * 2008-04-08 2013-07-25 Federal-Mogul Corporation Thermal spray applications using iron based alloy powder
WO2014149932A1 (fr) * 2013-03-15 2014-09-25 Federal-Mogul Corporation Compositions de métal en poudre pour des applications de résistance à l'usure et à la température et leur procédé de production
US9162285B2 (en) 2008-04-08 2015-10-20 Federal-Mogul Corporation Powder metal compositions for wear and temperature resistance applications and method of producing same
US9546412B2 (en) 2008-04-08 2017-01-17 Federal-Mogul Corporation Powdered metal alloy composition for wear and temperature resistance applications and method of producing same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3591349A (en) * 1969-08-27 1971-07-06 Int Nickel Co High carbon tool steels by powder metallurgy
FR2106034A5 (fr) * 1970-08-28 1972-04-28 Hoeganaes Ab
FR2151279A5 (fr) * 1971-08-20 1973-04-13 Boehler & Co Ag Geb
FR2185017A1 (fr) * 1972-05-18 1973-12-28 Stora Kopparbergs Bergslags Ab
FR2436824A1 (fr) * 1978-09-20 1980-04-18 Crucible Inc Poudre d'acier au cr-v, objets fabriques a partir de cette poudre et susceptibles d'un traitement thermique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3591349A (en) * 1969-08-27 1971-07-06 Int Nickel Co High carbon tool steels by powder metallurgy
FR2106034A5 (fr) * 1970-08-28 1972-04-28 Hoeganaes Ab
FR2151279A5 (fr) * 1971-08-20 1973-04-13 Boehler & Co Ag Geb
FR2185017A1 (fr) * 1972-05-18 1973-12-28 Stora Kopparbergs Bergslags Ab
FR2436824A1 (fr) * 1978-09-20 1980-04-18 Crucible Inc Poudre d'acier au cr-v, objets fabriques a partir de cette poudre et susceptibles d'un traitement thermique

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0322397A2 (fr) * 1987-12-23 1989-06-28 BÖHLER Gesellschaft m.b.H. Acier à coupe rapide préparé par la métallurgie des poudres, objet résistant à l'usure et procédé de préparation de cet acier
EP0322397A3 (en) * 1987-12-23 1989-10-25 Bohler Gesellschaft M.B.H. High speed steel prepared by powder metallurgy, wear-resistant part prepared thereby and process for its manufacture
WO1996028580A1 (fr) * 1995-03-10 1996-09-19 Powdrex Limited Poudres d'acier inoxydable et articles produits a l'aide de celles-ci par metallurgie des poudres
US5856625A (en) * 1995-03-10 1999-01-05 Powdrex Limited Stainless steel powders and articles produced therefrom by powder metallurgy
US20130186237A1 (en) * 2008-04-08 2013-07-25 Federal-Mogul Corporation Thermal spray applications using iron based alloy powder
US9162285B2 (en) 2008-04-08 2015-10-20 Federal-Mogul Corporation Powder metal compositions for wear and temperature resistance applications and method of producing same
US9546412B2 (en) 2008-04-08 2017-01-17 Federal-Mogul Corporation Powdered metal alloy composition for wear and temperature resistance applications and method of producing same
US9624568B2 (en) 2008-04-08 2017-04-18 Federal-Mogul Corporation Thermal spray applications using iron based alloy powder
US10543535B2 (en) 2008-04-08 2020-01-28 Tenneco Inc. Method for producing powder metal compositions for wear and temperature resistance applications
WO2014149932A1 (fr) * 2013-03-15 2014-09-25 Federal-Mogul Corporation Compositions de métal en poudre pour des applications de résistance à l'usure et à la température et leur procédé de production
CN105307803A (zh) * 2013-03-15 2016-02-03 费德罗-莫格尔公司 用于耐磨和耐热应用的粉末金属组合物及其生产方法

Also Published As

Publication number Publication date
DE3461548D1 (en) 1987-01-15
AT383619B (de) 1987-07-27
ATA231683A (de) 1986-12-15
EP0130177B1 (fr) 1986-12-03

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