EP0097737B1 - Procédé de fabrication par la métallurgie des poudres de pièces en acier allié au Si-Mn ou Si-Mn-C présentant une résistance et dureté élevée - Google Patents

Procédé de fabrication par la métallurgie des poudres de pièces en acier allié au Si-Mn ou Si-Mn-C présentant une résistance et dureté élevée Download PDF

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Publication number
EP0097737B1
EP0097737B1 EP82110622A EP82110622A EP0097737B1 EP 0097737 B1 EP0097737 B1 EP 0097737B1 EP 82110622 A EP82110622 A EP 82110622A EP 82110622 A EP82110622 A EP 82110622A EP 0097737 B1 EP0097737 B1 EP 0097737B1
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Prior art keywords
silicon
manganese
alloy
powder
sintering
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EP82110622A
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German (de)
English (en)
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EP0097737A1 (fr
Inventor
Fritz Prof. Dr. Thümmler
Aloisio Klein
Rainer Oberacker
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Karlsruher Institut fuer Technologie KIT
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Kernforschungszentrum Karlsruhe GmbH
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Application filed by Kernforschungszentrum Karlsruhe GmbH filed Critical Kernforschungszentrum Karlsruhe GmbH
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    • 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
    • C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
    • C22C33/0271—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5% with only C, Mn, Si, P, S, As as alloying elements, e.g. carbon steel
    • 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
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy

Definitions

  • the invention relates to a method for the powder-metallurgical production of dimensionally stable molded parts of high strength and hardness from silicon-manganese or silicon-manganese-carbon alloy steels.
  • the elements Cu, Ni, Mo, P and C are mainly used as alloying elements.
  • a whole range of alloying elements that are successfully used in melt metallurgy can only be used to a limited extent in powder metallurgy.
  • Si is known as a solidifying solidifying agent. Significant increases in strength can also be achieved with Si in powder-metallurgically manufactured Fe-based alloys (Hoffmann, G., Thümmler, F., Zapf, G .; Sintering, Homogenization and Properties of a-Phase Iron-Aluminum and Iron-Silicon Alloys; Powder Metallurgy, 3rd European Powd. Met. Symp. 1971 Conf. Supplement, Pt. 1, 335-361).
  • Mn has also found its way into powder metallurgy as an alloying element. Since it is also very affinity for oxygen, special protective measures are also required here. Is known for. B. the introduction of Mn over carbide master alloys [process for producing homogeneous manganese alloyed sintered steels; German Patent 2,456,781]. These master alloys are stable up to the sintering temperature, which protects the alloying elements against oxidation. However, since Mn is not itself a strong carbide former, these master alloys must necessarily contain carbide-forming elements, e.g. Contain Cr, Mo or V. These elements are very expensive, which greatly increases the alloying costs. The high hardness of the carbides also causes increased tool wear.
  • the invention has for its object to provide a method for the powder metallurgical production of molded parts from sintered steels, which can be manufactured to size during the sintering process, i.e. they should not suffer any shrinkage and / or no loss of strength due to anti-shrinkage measures due to additions of alloying elements.
  • the method according to the invention in which exclusively more easily available alloy elements, the covering of which is ensured in the long term, are used, it should be possible to produce molded parts with high strength and hardness and sufficient toughness.
  • the object is achieved by the method according to the invention in that the alloy elements silicon and manganese or silicon, manganese and carbon are alloyed with ferrosilicon, ferromanganese or a silicon-manganese-iron master alloy with silicon and manganese contents in the ranges 10 to 30 wt .-% Si, 20 to 70 wt .-% Mn, remainder Fe and graphite in powder form mixed with an iron powder in amounts that correspond to the mass fractions in the powder mixture correspond to a mass ratio of manganese to silicon of between 1.5 and 3, and the powder mixture is pressed in a manner known per se and sintered and cooled at a temperature in the range from 1150 ° C. to 1250 ° C. under a protective gas atmosphere.
  • a ferrosilicon with 15% by weight Si and / or a ferromanganese with 80 to 84% by weight Mn is advantageously used. Products which show the best mechanical properties are obtained when a silicon-manganese-iron master alloy of the composition 19% by weight Si, 41% by weight Mn and 40% by weight Fe is used.
  • the sintered molded parts produced by the process according to the invention can be subjected to an additional heat treatment consisting of hardening and tempering.
  • Example 2 The alloy used in Example 2 was sintered in hydrogen at 1200 ° C. for 60 min and then tempered. Tempering treatment: Austenitized at 1000 ° C, 60 min. in argon, quenched in oil, tempered for 60 min. in argon at the temperatures indicated (see FIG. 6). Optimal strength and hardness values are achieved at tempering temperatures of 200 to 300 ° C, the elongation at break is still measurable (> 1%).
  • the master alloy was melted in a vacuum furnace and, after cooling, mechanically comminuted to a particle size below 25 ⁇ m (average particle size about 10 ⁇ m).
  • the comminution can take place in a crusher, in a vibrating disk mill or in a ball mill.
  • FIGS. 7 and 8 The mechanical properties and the dimensional changes of the silicon-manganese or silicon-manganese-carbon alloy sintered steels produced according to this are shown in FIGS. 7 and 8.
  • Figure 7 shows the optimization of the content of the master alloy used, an optimal content of about 8 wt .-% (these are manganese and silicon contents in the sintered alloy of 3.3 wt .-% manganese and 1.5 wt .-% silicon) was determined.
  • FIG. 8 shows the influence of the carbon content in the optimal alloy (8% by weight pre-alloy in the sintered steel).
  • Dimensional stability can be achieved by suitably adjusting the composition and sintering temperature.
  • the Si-Mn-Fe master alloys in the specified ranges for the silicon and manganese content also lead to the formation of a liquid phase in the specified range of technical sintering temperatures during the sintering process, which is responsible for the substantial improvement in the properties of the sintered steels produced according to the invention.
  • Lower levels of manganese and silicon require too high proportions of a master alloy to achieve optimum alloy levels. This makes the powder mixtures more difficult to press, which leads to a decrease in density. Higher contents, especially of silicon, no longer lead to the formation of a liquid phase in the range of sintering temperatures up to approx. 12500C.

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

Claims (4)

1. Procédé pour la fabrication par la métallurgie des poudres de pièces moulées aux dimensions stables, à résistance et dureté élevées, en aciers alliés au silicium-manganèse ou au silicium-manganèse-carbone, caractérisé en ce que l'on ajoute à une poudre de fer les éléments d'alliage silicium et manganèse ou silicium, manganèse et carbone par l'intermédiaire des porteurs d'alliage ferrosilicium, ferromanganèse ou d'un alliage préliminaire silicium-manganèse-fer ayant des teneurs en silicium et en manganèse allant de 10 à 30% en poids de Si, de 20 à 70% en poids de Mn, le reste étant constitué de fer et de graphite sous forme de poudre, en quantités qui correspondent aux proportions de matière dans le mélange de poudres allant:
Figure imgb0015
à un rapport des masses entre le manganèse et le silicium compris entre 1,5 et 3, puis on comprime le mélange de poudres d'une façon connue en soi et on le fritte sous atmosphère constituée de gaz inerte à une température allant de 1150 à 1250°C et on le refroidit.
2. Procédé selon la revendication 1, caractérisé en ce que l'on utilise un ferrosilicium contenant 15% en poids de Si.
3. Procédé selon la revendication 1, caractérisé en ce que l'on utilise un ferromanganèse contenant de 80 à 84% en poids de manganèse.
4. Procédé selon la revendication 1, caractérisé en ce que l'on utilise un alliage préliminaire de sificium-manganèse-fer de composition:
Figure imgb0016
EP82110622A 1982-05-22 1982-11-18 Procédé de fabrication par la métallurgie des poudres de pièces en acier allié au Si-Mn ou Si-Mn-C présentant une résistance et dureté élevée Expired EP0097737B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82110622T ATE23198T1 (de) 1982-05-22 1982-11-18 Verfahren zur pulvermetallurgischen herstellung von formteilen hoher festigkeit und haerte aus si- mn- oder si-mn-c-legierten staehlen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823219324 DE3219324A1 (de) 1982-05-22 1982-05-22 Verfahren zur pulvermetallurgischen herstellung von formteilen hoher festigkeit und haerte aus si-mn- oder si-mn-c-legierten staehlen
DE3219324 1982-05-22

Publications (2)

Publication Number Publication Date
EP0097737A1 EP0097737A1 (fr) 1984-01-11
EP0097737B1 true EP0097737B1 (fr) 1986-10-29

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ID=6164277

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Country Link
US (1) US4913739A (fr)
EP (1) EP0097737B1 (fr)
JP (1) JPS58210147A (fr)
AT (1) ATE23198T1 (fr)
DE (2) DE3219324A1 (fr)

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US5711187A (en) * 1990-10-08 1998-01-27 Formflo Ltd. Gear wheels rolled from powder metal blanks and method of manufacture
JPH0827388B2 (ja) * 1990-11-08 1996-03-21 動力炉・核燃料開発事業団 耐熱放射線遮蔽材
EP0846782A1 (fr) * 1992-09-09 1998-06-10 STACKPOLE Limited Procédé de préparation d'un alliage à base de métal pulvérulent
WO1994005822A1 (fr) * 1992-09-09 1994-03-17 Stackpole Limited Procede de preparation d'un alliage a base de metal pulverulent
JPH08501832A (ja) * 1992-09-25 1996-02-27 パウドレックス リミテッド 焼結合金鋼成分の生成方法
AU3154793A (en) * 1992-12-21 1994-07-19 Stackpole Limited As sintered coining process
ATE195276T1 (de) * 1992-12-21 2000-08-15 Stackpole Ltd Verfahren zur herstellung von lagern
EP0742844A1 (fr) * 1994-02-07 1996-11-20 Stackpole Limited Alliage fritte haute densite
SE9404110D0 (sv) * 1994-11-25 1994-11-25 Hoeganaes Ab Manganese containing materials having high tensile strength
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US5997805A (en) * 1997-06-19 1999-12-07 Stackpole Limited High carbon, high density forming
US20050053512A1 (en) * 2003-09-09 2005-03-10 Roche Castings Pty Ltd Alloy steel composition
US7153339B2 (en) 2004-04-06 2006-12-26 Hoeganaes Corporation Powder metallurgical compositions and methods for making the same
WO2005103315A1 (fr) * 2004-04-23 2005-11-03 Kabushiki Kaisha Toyota Chuo Kenkyusho Alliage fritté à base de fer, élément d’un alliage fritté à base de fer et procédé pour la fabrication de ceux-ci
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US7237730B2 (en) * 2005-03-17 2007-07-03 Pratt & Whitney Canada Corp. Modular fuel nozzle and method of making
US8316541B2 (en) 2007-06-29 2012-11-27 Pratt & Whitney Canada Corp. Combustor heat shield with integrated louver and method of manufacturing the same
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WO2009088771A2 (fr) * 2008-01-04 2009-07-16 Gkn Sinter Metals, Llc Tige de liaison forgée à base de poudre de cuivre pré-alliée
US9248500B2 (en) * 2008-08-04 2016-02-02 Apex Advanced Technologies, Llc Method for protecting powder metallurgy alloy elements from oxidation and/or hydrolization during sintering
JP5535576B2 (ja) * 2008-11-10 2014-07-02 株式会社豊田中央研究所 鉄基焼結合金およびその製造方法並びに鉄基焼結合金部材
JP5308123B2 (ja) * 2008-11-10 2013-10-09 株式会社神戸製鋼所 高強度組成鉄粉とそれを用いた焼結部品
CN103600081B (zh) * 2013-10-10 2016-05-04 铜陵新创流体科技有限公司 一种粉末冶金制冷压缩机阀片及其制备方法
CN103600075B (zh) * 2013-10-10 2016-06-29 铜陵新创流体科技有限公司 一种粉末冶金无钴铁基合金及其制备方法
CN103600074B (zh) * 2013-10-10 2016-05-04 铜陵新创流体科技有限公司 一种粉末冶金耐磨合金及其制备方法
CN103600073B (zh) * 2013-10-10 2016-05-04 铜陵新创流体科技有限公司 一种粉末冶金链轮及其制备方法
CN103600076B (zh) * 2013-10-10 2016-05-04 铜陵新创流体科技有限公司 一种粉末冶金汽车转向助力泵定子及其制备方法
CN110756814B (zh) * 2018-07-26 2022-08-05 广东美芝制冷设备有限公司 无铜冶金材料的制备方法及无铜冶金材料、平衡块和压缩机

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US4913739A (en) 1990-04-03
EP0097737A1 (fr) 1984-01-11
DE3219324A1 (de) 1983-11-24
JPS58210147A (ja) 1983-12-07
ATE23198T1 (de) 1986-11-15
DE3273998D1 (en) 1986-12-04

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