EP2379763B1 - Alliage maître fer-carbone - Google Patents

Alliage maître fer-carbone Download PDF

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Publication number
EP2379763B1
EP2379763B1 EP09799095.6A EP09799095A EP2379763B1 EP 2379763 B1 EP2379763 B1 EP 2379763B1 EP 09799095 A EP09799095 A EP 09799095A EP 2379763 B1 EP2379763 B1 EP 2379763B1
Authority
EP
European Patent Office
Prior art keywords
mass
precursor
iron
master
mpa
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.)
Not-in-force
Application number
EP09799095.6A
Other languages
German (de)
English (en)
Other versions
EP2379763A1 (fr
Inventor
Christian Gierl
Herbert Danninger
Yousef Hemmatpour
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.)
Technische Universitaet Wien
Original Assignee
Technische Universitaet Wien
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 Technische Universitaet Wien filed Critical Technische Universitaet Wien
Publication of EP2379763A1 publication Critical patent/EP2379763A1/fr
Application granted granted Critical
Publication of EP2379763B1 publication Critical patent/EP2379763B1/fr
Not-in-force 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
    • 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 being used for high mechanical stresses, viz. in automobile engines and transmissions. Starting from powder mixtures, the parts are pressed axially in pressing tools and then sintered at temperatures of about 1120-1300 ° C under inert gas. In many cases, a heat treatment of the blank, such as e.g. Hardening, carburizing etc., on. It is important to achieve the highest possible relative density - i. low residual porosity - even during pressing, since the porosity during sintering of these moldings hardly decreases and the mechanical properties with higher density correspondingly lower porosity significantly better.
  • Residual iron provided, which has a particle size of> 20 microns and a hardness of ⁇ 350 HV 0.01.
  • carbon master alloy which is similar to the base powder in terms of particle size distribution, but has a high C content, namely up to 8% by mass
  • the carbon diffuses during sintering in the particles of the base powder and is thus distributed homogeneously in the material.
  • this Masteralloy is harder than the base powder, it is much softer than carbide powder. Since only a small percentage of Masteralloy is mixed with the preferably C-free base powder, the effect on pressibility is marginal.
  • the carbon is present in the Masteralloy as cementite Fe 3 C, with a density of 7.4 g.cm -3 .
  • this density practically does not change, above all, no additional pores are formed. That is, the achievable density is limited only by the compressibility of the powder itself - and possibly by the presence of organic lubricants - but not by the volume requirement of the carbon carrier. Since the particles of the Masteralloys have similar size and geometry as the base powder, the segregation tendency is minimal, so dusting can not occur.
  • 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 ° 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 prior art Cr alloyed iron powder JP 62063647 used steels.
  • Master Original 1 446 ⁇ 139 Master 1 annealed: 297 ⁇ 86 Master Original 2: 352 ⁇ 60 Master 2 annealed: 250 ⁇ 63 Master Original 3: 211 ⁇ 66 Master 3 annealed: 111 ⁇ 45
  • annealed master alloy according to the present invention results in improved properties over unannealed master alloys ("Master Original"). Although the values are somewhat lower than with direct admixture of carbon, a significant drawback of direct admixture, namely segregation, is particularly discouraged in large scale use become.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Claims (7)

  1. Alliage-maître fer-carbone ayant une teneur en C comprise entre 3 et 8 % en masse et une limite supérieure de métaux d'alliage telle que
    Ni < 10 % en masse,
    P < 4 % en masse,
    Cr < 5 % en masse, de préférence < 1 % en masse,
    Mn < 5 % en masse, de préférence < 1 % en masse,
    Mo < 3 % en masse,
    W < 3 % en masse,
    Cu < 1 % en masse,
    le reste étant du fer,
    l'alliage-maître fer-carbone présentant une granulométrie > 20 µm et une dureté < 350 HV 0,01.
  2. Alliage-maître fer-carbone selon la revendication 1, caractérisé par une teneur en C comprise entre 4 et 6 % en masse et une limite supérieure de métaux d'alliage telle que
    Ni < 5 % en masse,
    P < 2 % en masse,
    Cr < 0,5 % en masse,
    Mn < 0,5 % en masse,
    Mo < 1,5 % en masse,
    W < 1,5 % en masse,
    Cu < 0,5 % en masse.
  3. Procédé de fabrication d'un alliage-maître fer-carbone selon l'une des revendications 1 ou 2, caractérisé en ce qu'il comprend les étapes suivantes :
    - fabrication d'un précurseur pulvérulent riche en C,
    - éventuellement, recuit préalable du précurseur,
    - éventuellement désagglomération du précurseur,
    - recuit du précurseur pulvérulent riche en C jusqu'à une température supérieure d'au moins 80 °C à la température γ (température eutectoïde) du diagramme d'état correspondant à la composition du précurseur,
    - refroidissement du précurseur à une vitesse de refroidissement maximale de 3 °C/min, le précurseur recuit étant de préférence refroidi à une vitesse de refroidissement maximale de 3 °C/min jusqu'à une température de 500 °C, et la vitesse de refroidissement étant ensuite augmentée.
  4. Procédé selon la revendication 3, caractérisé en ce que le précurseur pulvérulent riche en C est fabriqué par atomisation d'une masse fondue de C et de Fe ou d'acier.
  5. Procédé selon la revendication 3, caractérisé en ce que le précurseur pulvérulent riche en C est fabriqué par mélange d'une poudre finement divisée de Fe ou d'acier avec du C, puis recuit de mise en solution.
  6. Procédé selon l'une des revendications 3 à 5, caractérisé en ce que le précurseur recuit est refroidi à une vitesse de refroidissement maximale de 0,5 °C/min.
  7. Procédé selon l'une des revendications 3 à 6, caractérisé en ce que le recuit et le refroidissement du précurseur ont lieu sous une atmosphère d'un gaz protecteur.
EP09799095.6A 2008-12-19 2009-12-17 Alliage maître fer-carbone Not-in-force EP2379763B1 (fr)

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 (fr) 2008-12-19 2009-12-17 Alliage maître fer-carbone

Publications (2)

Publication Number Publication Date
EP2379763A1 EP2379763A1 (fr) 2011-10-26
EP2379763B1 true EP2379763B1 (fr) 2019-07-17

Family

ID=41660298

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09799095.6A Not-in-force EP2379763B1 (fr) 2008-12-19 2009-12-17 Alliage maître fer-carbone

Country Status (4)

Country Link
US (1) US9359662B2 (fr)
EP (1) EP2379763B1 (fr)
AT (1) AT507707B1 (fr)
WO (1) WO2010070065A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102933731B (zh) * 2010-02-15 2016-02-03 费德罗-莫格尔公司 一种用于制造烧结硬化钢零件的中间合金以及该烧结硬化零件的制造工艺
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
RU2652922C1 (ru) * 2017-12-05 2018-05-03 Юлия Алексеевна Щепочкина Сплав на основе железа
RU2652928C1 (ru) * 2017-12-05 2018-05-03 Юлия Алексеевна Щепочкина Сплав на основе железа
RU2663955C1 (ru) * 2018-02-13 2018-08-13 Юлия Алексеевна Щепочкина Сплав на основе железа
RU2665644C1 (ru) * 2018-02-13 2018-09-03 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

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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

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Also Published As

Publication number Publication date
AT507707B1 (de) 2010-09-15
EP2379763A1 (fr) 2011-10-26
US20110253264A1 (en) 2011-10-20
WO2010070065A1 (fr) 2010-06-24
AT507707A1 (de) 2010-07-15
US9359662B2 (en) 2016-06-07

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