EP2379763A1 - Eisen-kohlenstoff masteralloy - Google Patents
Eisen-kohlenstoff masteralloyInfo
- Publication number
- EP2379763A1 EP2379763A1 EP09799095A EP09799095A EP2379763A1 EP 2379763 A1 EP2379763 A1 EP 2379763A1 EP 09799095 A EP09799095 A EP 09799095A EP 09799095 A EP09799095 A EP 09799095A EP 2379763 A1 EP2379763 A1 EP 2379763A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mass
- precursor
- iron
- carbon
- master
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
- C22C35/005—Master alloys for iron or steel based on iron, e.g. ferro-alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
Definitions
- Iron-based powder metallurgy moldings are increasingly used for high mechanical stresses, especially in automotive engines and transmissions. Starting from powder mixtures, the parts are pressed axially in pressing tools and then sintered at temperatures of about 1120-1300 0 C under inert gas. In many cases, a heat treatment of the blank, such as hardening, carburizing, etc., follows. It is important to achieve the highest possible relative density - ie low residual porosity - even during pressing, since the porosity during sintering of these moldings hardly decreases and the mechanical properties with higher density corresponding to lower porosity significantly better.
- JP 62063647 discloses an iron-carbon master alloy Fe-Y% C with 0.5 ⁇ Y ⁇ 6.7. This powder is added in an amount of Z% of an iron-based alloy containing A% oxygen, where Y x Z> 0.75 x A. According to the description, a Cr alloyed iron powder is used for the master alloy. A heat treatment takes place only after the sintering of the alloy.
- an iron-carbon masteralloy having a C content of between 0.3 and 8% by weight and an upper limit of alloying metals will now be mentioned
- Mn ⁇ 5% mass, preferably ⁇ 1% mass
- Carbon is introduced into the alloy to be formed via a master alloy, which is similar to the base powder in terms of particle size distribution, but has a high carbon content, namely up to 8% by mass ("carbon master alloy") From the particles of this master alloy The carbon diffuses during sintering into the particles of the base powder and is thus homogeneously distributed in the material.
- This Masteralloy is harder than the base powder, but much softer than eg carbide powder because only a small percentage of Masteralloy is mixed with the preferably C-free base powder the effect on compressibility is marginal.
- the carbon is present in the Masteralloy as cementite Fe 3 C, with a density of 7.4 g.cm -3 .
- the masteralloy according to the invention has a C content of between 3 and 8% by weight, particularly preferably a C content of between 4 and 6% by weight and an upper limit of alloying metals
- the essential point in the process according to the invention is the soft annealing of the precursor.
- the preparation of the powdery C-rich precursor is carried out by atomizing a melt of C and Fe or steel.
- This precursor is still superficially oxidized after water atomization and hardened by the rapid cooling, it is therefore preferably annealed in a furnace under inert gas reducing reductive.
- the powdery C-rich precursor is prepared by mixing finely divided Fe or steel powder with C and a subsequent annealing treatment which solubilizes the carbon in the iron powder.
- a subsequent annealing treatment which solubilizes the carbon in the iron powder.
- the annealed precursor with a cooling rate of max. 3 ° C / min is cooled to a temperature of 500 0 C and then increases the cooling rate.
- the goal of the heat treatment is to provide non-cure or low cure discrete areas of cementite or bainite and coarsened discrete areas, respectively.
- annealing and cooling of the precursor takes place under a protective gas atmosphere (reducing or neutral), which is particularly effective in superficial oxidation of the precursor.
- a protective gas atmosphere reducing or neutral
- the processing of the finished master alloy can be done according to the established techniques of iron powder metallurgy, i. by mixing with base powder, die pressing and sintering; Changes to the systems or the process control are not necessary. Also, the new consolidation techniques such as hot pressing, high velocity compaction etc. are easily possible.
- KIP 4100 is a Cr-alloyed iron powder according to the prior art JP 62063647 used steels.
- the use of the soft annealed master alloy according to the invention results in improved properties over unannealed master alloys ("Master Original"). Although the values are somewhat lower than with direct admixture of carbon, a major drawback of direct admixture, namely segregation, can be avoided especially in large-scale use.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0198908A AT507707B1 (de) | 2008-12-19 | 2008-12-19 | Eisen-kohlenstoff masteralloy |
PCT/EP2009/067445 WO2010070065A1 (de) | 2008-12-19 | 2009-12-17 | Eisen-kohlenstoff masteralloy |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2379763A1 true EP2379763A1 (de) | 2011-10-26 |
EP2379763B1 EP2379763B1 (de) | 2019-07-17 |
Family
ID=41660298
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09799095.6A Not-in-force EP2379763B1 (de) | 2008-12-19 | 2009-12-17 | Eisen-kohlenstoff masteralloy |
Country Status (4)
Country | Link |
---|---|
US (1) | US9359662B2 (de) |
EP (1) | EP2379763B1 (de) |
AT (1) | AT507707B1 (de) |
WO (1) | WO2010070065A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2536862A4 (de) * | 2010-02-15 | 2016-07-13 | Federal Mogul Corp | Vorlegierung zur herstellung von sintergehärteten stahlteilen und verfahren zur herstellung von sintergehärteten teilen |
CN105648333A (zh) * | 2016-03-31 | 2016-06-08 | 泰安皆瑞金属科技有限公司 | 一种含铜铁基粉末冶金材料及其制备工艺 |
CN107297494A (zh) * | 2017-06-20 | 2017-10-27 | 江苏军威电子科技有限公司 | 一种园艺工具用混合粉及其制备方法 |
RU2652928C1 (ru) * | 2017-12-05 | 2018-05-03 | Юлия Алексеевна Щепочкина | Сплав на основе железа |
RU2652922C1 (ru) * | 2017-12-05 | 2018-05-03 | Юлия Алексеевна Щепочкина | Сплав на основе железа |
RU2665644C1 (ru) * | 2018-02-13 | 2018-09-03 | Юлия Алексеевна Щепочкина | Сплав на основе железа |
RU2663955C1 (ru) * | 2018-02-13 | 2018-08-13 | Юлия Алексеевна Щепочкина | Сплав на основе железа |
CN108425063B (zh) * | 2018-03-20 | 2019-07-12 | 湖州久立永兴特种合金材料有限公司 | 一种高纯净度高锰中间合金的制备方法 |
CN110695352A (zh) * | 2019-11-08 | 2020-01-17 | 常熟市迅达粉末冶金有限公司 | 一种转向器固定片的加工方法 |
CN111702167A (zh) * | 2020-06-24 | 2020-09-25 | 重庆科利得精密机械工业有限公司 | 一种铁基粉末冶金的三步混料工艺 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3368890A (en) | 1966-12-27 | 1968-02-13 | Gen Motors Corp | Metal powder from cast iron chips |
DE1960433A1 (de) * | 1969-12-02 | 1971-06-03 | Naeser Ge Hard Dr Ing | ?isenpulver fuer Presszwecke mit Kohlenstoffg?halten zwischen 0.02 und 1.2? und Verfahren zu ihrer Herstellung |
JPS62124256A (ja) | 1985-11-21 | 1987-06-05 | Kawasaki Steel Corp | 黒鉛が析出した摺動部材用焼結鋼 |
JPS6318001A (ja) | 1986-07-11 | 1988-01-25 | Kawasaki Steel Corp | 粉末冶金用合金鋼粉 |
JPH06228603A (ja) * | 1993-01-29 | 1994-08-16 | Iwate Seitetsu Kk | 焼結金属用原料鉄粉およびその製造方法 |
US6358298B1 (en) * | 1999-07-30 | 2002-03-19 | Quebec Metal Powders Limited | Iron-graphite composite powders and sintered articles produced therefrom |
US20060201280A1 (en) * | 2004-06-10 | 2006-09-14 | Kuen-Shyang Hwang | Sinter-hardening powder and their sintered compacts |
-
2008
- 2008-12-19 AT AT0198908A patent/AT507707B1/de not_active IP Right Cessation
-
2009
- 2009-12-17 WO PCT/EP2009/067445 patent/WO2010070065A1/de active Application Filing
- 2009-12-17 EP EP09799095.6A patent/EP2379763B1/de not_active Not-in-force
- 2009-12-17 US US13/140,811 patent/US9359662B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2010070065A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2379763B1 (de) | 2019-07-17 |
US9359662B2 (en) | 2016-06-07 |
AT507707A1 (de) | 2010-07-15 |
US20110253264A1 (en) | 2011-10-20 |
AT507707B1 (de) | 2010-09-15 |
WO2010070065A1 (de) | 2010-06-24 |
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