EP0130177B1 - Alliage ferreux fritté - Google Patents
Alliage ferreux fritté Download PDFInfo
- Publication number
- EP0130177B1 EP0130177B1 EP19840890116 EP84890116A EP0130177B1 EP 0130177 B1 EP0130177 B1 EP 0130177B1 EP 19840890116 EP19840890116 EP 19840890116 EP 84890116 A EP84890116 A EP 84890116A EP 0130177 B1 EP0130177 B1 EP 0130177B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- content
- iron
- base alloy
- 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.)
- Expired
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
- C22C33/0278—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, expands a minimum content of 0.1% by weight of phosphorus, as a result of which a liquid phase sintering at temperatures below 1,250 ° C. should be achieved.
- 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 remelt such alloys using the electro-slag remelting method. As a result, a slight increase in mechanical strength can be achieved, while at the same time there is an improvement in the hot deformability 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.
- the sintered alloy based on iron, in particular for cold work tools, has a content in% by weight Remainder iron and manufacturing-related impurities 25.
- a tool e.g. B. ram, cutting tools, stone working tools, punching tools and. Like. are obtained, which has a high hardness and thus dimensional stability.
- the simultaneous presence of vanadium and tungsten results in a better hardening depth, whereby a higher hardness is caused by the niobium 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 held in order to obtain the desired powder in a nitrogen atomization process. This powder was obtained by hot isostatic pressing at a temperature of approximately 1,050 ° C at 1 000 bar and exposure time 3 hours. Samples were produced from the pressed bodies or casting blocks obtained in this way, which were then subjected to the tests. To determine the twist rate at 1,100 ° C., the samples were heated to 1,100 ° C. and held at this temperature for 15 minutes and then twisted in a warm torsion device until they broke. To determine the flexural strength ( QbB ), the sample was adjusted to a hardness of 63 HRc by tempering.
- Table 2 shows the hardness, the flexural strength and the number of twists up to Fracture at 1100 ° C of the cast samples compared with those obtained by sinter 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 content shows a reduction in the flexural strength and the deformability, which is directly attributable to the increased proportion of carbides.
- this increases the 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 is extremely poor in the cast alloys, whereas this has been retained in 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 is still fully given. (See tables 1 and 2 page 4 ff,)
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Claims (2)
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 EP0130177A1 (fr) | 1985-01-02 |
EP0130177B1 true 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 (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10124411B2 (en) | 2008-04-08 | 2018-11-13 | Federal-Mogul Llc | Method for producing powder metal compositions for wear and temperature resistance applications and method of producing same |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT391324B (de) * | 1987-12-23 | 1990-09-25 | Boehler Gmbh | Pulvermetallurgisch hergestellter schnellarbeitsstahl, daraus hergestellter verschleissteil und verfahren zu seiner herstellung |
JP4439591B2 (ja) * | 1995-03-10 | 2010-03-24 | パウドレックス、リミテッド | ステンレス鋼粉末およびその粉末から粉末冶金により製造された製品 |
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 |
MX2015012984A (es) * | 2013-03-15 | 2016-05-10 | Federal Mogul Corp | Composiciones de metal en polvo para aplicaciones de resistencia al desgaste y temperatura y metodo para producirlas. |
Family Cites Families (5)
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 |
SE344968C (sv) * | 1970-08-28 | 1976-01-22 | Hoeganaes Ab | Pulvermaterial for framstellning av hoglegerat stal med god anlopningsbestendighet och varmhardhet |
DE2141786A1 (de) * | 1971-08-20 | 1973-02-22 | Boehler & Co Ag Geb | Verwendung von ledeburitischen chromstaehlen zur herstellung von umformwerkzeugen fuer die spanlose formgebung mit hoher druckbelastbarkeit und schneidenden kanten |
DE2324071A1 (de) * | 1972-05-18 | 1973-12-06 | Stora Kopparbergs Bergslags Ab | Kaltbearbeitungsstahl, insbesondere fuer spanabhebende bearbeitung |
US4249945A (en) * | 1978-09-20 | 1981-02-10 | Crucible Inc. | Powder-metallurgy steel article with high vanadium-carbide content |
-
1983
- 1983-06-23 AT AT0231683A patent/AT383619B/de not_active IP Right Cessation
-
1984
- 1984-06-20 DE DE8484890116T patent/DE3461548D1/de not_active Expired
- 1984-06-20 EP EP19840890116 patent/EP0130177B1/fr not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10124411B2 (en) | 2008-04-08 | 2018-11-13 | Federal-Mogul Llc | Method for producing powder metal compositions for wear and temperature resistance applications and method of producing same |
Also Published As
Publication number | Publication date |
---|---|
DE3461548D1 (en) | 1987-01-15 |
AT383619B (de) | 1987-07-27 |
ATA231683A (de) | 1986-12-15 |
EP0130177A1 (fr) | 1985-01-02 |
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