EP0039503B1 - Procédé de traitement d'alliages à base de cuivre et pièces de moulage en ces alliages, obtenues selon ce procédé - Google Patents

Procédé de traitement d'alliages à base de cuivre et pièces de moulage en ces alliages, obtenues selon ce procédé Download PDF

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Publication number
EP0039503B1
EP0039503B1 EP19810103356 EP81103356A EP0039503B1 EP 0039503 B1 EP0039503 B1 EP 0039503B1 EP 19810103356 EP19810103356 EP 19810103356 EP 81103356 A EP81103356 A EP 81103356A EP 0039503 B1 EP0039503 B1 EP 0039503B1
Authority
EP
European Patent Office
Prior art keywords
copper base
cast
tin
mold
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
Application number
EP19810103356
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German (de)
English (en)
Other versions
EP0039503A1 (fr
Inventor
Prakash D. Parikh
Louis P. Stone
Eugene Shapiro
Derek E. Tyler
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.)
Olin Corp
Original Assignee
Olin Corp
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 Olin Corp filed Critical Olin Corp
Publication of EP0039503A1 publication Critical patent/EP0039503A1/fr
Application granted granted Critical
Publication of EP0039503B1 publication Critical patent/EP0039503B1/fr
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting

Definitions

  • the present invention deals with the provision of cast structures having good hot rollability.
  • the method of the present invention is a method for processing copper base alloys especially those containing silicon and tin to provide cast structures having good hot workability.
  • Hot rolling is the preferred processing practice, however, any hot working step is contemplated in accordance with the process of the present invention, such as drawing or extrusion. Throughout the present specification, however, hot rolling will be discussed as the preferred hot working step.
  • ingots are direct chill cast, preferably of silicon-tin bronzes, in a mold from liquid metal wherein the melt temperature entering the mold is 100 to 350°C in excess of the liquidus temperature.
  • This simple, convenient and expeditious practice provides a copper base alloy which is resistant to edge cracking during hot rolling.
  • the present invention also provides improved cast structures which exhibit surprisingly good hot rollability.
  • the cast copper base alloys comprise a first external inversely segregated surface zone, a second bulk ingot zone and a subsurface denuded zone bridging said first and second zones exhibiting a uniform coarse grain structure which is devoid of second phases.
  • the improved cast structures are preferably present in silicon-tin bronzes as aforesaid, it is a finding of the present invention that the present process preferentially provides said structures with resultant improved hot rollability in copper alloys generally, as, for example, in aluminum bronzes, tin bronzes and tin brasses.
  • the present invention will be discussed hereinbelow with regard to this alloy system.
  • surprisingly improved cast structures are obtained utilizing higher than normal superheats in direct chill casting.
  • the process of the present invention superheats the liquid metal to a temperature of from 100 to 350°C in excess of the liquidus temperature, and preferably 150 to 250°C in excess of the liquidus temperature. Ingots are then cast in a mold from the liquid metal wherein the melt temperature entering the mold is in said higher superheated range. It is surprising and unexpected to find that this simple and expeditious practice yields the improvements of the present invention.
  • Ingots cast by the DC or direct chill casting method exhibit characteristic structural features that are inherent in the modes of heat extraction effected by this technique.
  • a typical DC casting arrangement provides for the transfer of molten metal into a water cooled copper mold via a downspout distributor or similar distribution means. Solidification of the liquid metal is effected by heat transfer through the water cooled mold and by the direct impingement of water onto the ingot as it emerges from the mold. The ingot shell with associated fine grained structure is formed rapidly under high rates of heat extraction when the molten metal and mold are in contact. After reaching some critical thickness the ingot shell shrinks away from the mold wall. Solidification continues but under lower heat transfer conditions. Accordingly, the subsurface region so formed exhibits a coarser structure.
  • Solidification of the major part of the ingot section is achieved by the direct impingement of the sub- mold coolant onto the ingot surface.
  • the resultant structure is fine adjacent to the above subsurface region, and coarsens gradually on approaching the ingot center.
  • the high growth rate conditions operative during this solidification of the bulk realizes formation of columnar grains.
  • solute rich phases are formed in the dendrite arms and at grain boundaries. These phases possess lower melting temperatures than the primary dendrites. Accordingly, during formation of the above discussed subsurface region, when the heat extraction process is diminished the temperature of the ingot shell increases and these solute rich phases tend to remelt. As a result, inverse segregation and seams or spikes of these phases form along grain boundaries in these reheated regions. These features can and frequently are detrimental to the hot rolling performance of the resultant cast silicon-tin bronze.
  • the cast copper alloys of the present invention are characterized by a first external inversely segregated surface zone, a second internal bulk ingot zone, a subsurface denuded zone bridging said first and second zone exhibiting a uniform coarse grain structure which is devoid of second phases.
  • the casting is characterized by the presence of a denuded zone as clearly shown in Figure 3.
  • This should be contrasted to the continuum of second phases which characterize conventional processing as claerly shown in Figure 1.
  • cracks initiated in the ingot of Figure 3 would be blunted by the denuded zone, but would propagate through the continuum of the ingot of Figure 1.
  • the thickness of the zones will depend upon the particular alloy composition and exact processing conditions.
  • the process of the present invention preferably deals with silicon and tin containing copper base alloys.
  • the preferred silicon content is from 1 to 6% and the preferred tin content is from 0.2 to 5%.
  • alloying additions may readily be added to the silicon-tin bronze, such as mischmetal, chromium, manganese, iron, nickel and the like.
  • Chromium is a particularly preferred addition in an amount of at least 0.03% and preferably in an amount from 0.03 to 1.0%.
  • conventional impurities may be readily tolerated.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)

Claims (9)

1. Procédé pour traiter des alliages à base de cuivre dans le but de créer des structures de coulée se laissant bien travailler à chaud par la coulée à refroidissement direct de lingots de ces alliages dans une lingotière à partir de métal liquide, caractérisé en ce que la température du métal liquide entrant dans la lingotière est de 100 à 350°C supérieure au liquidus.
2. Procédé selon la revendication 1, caractérisé en ce que la température du métal liquide entrant dans la lingotière est de 150 à 250°C supérieure au liquidus.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on surchauffe le métal liquide à ladite température avant de le faire entrer dans la lingotière.
4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le lingot est laminé à chaud.
5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'alliage est un alliage à base de cuivre contenant du silicium et de l'étain.
6. Procédé selon la revendication 5, caractérisé en ce que l'alliage à base de cuivre contient 1 à 6% de silicium et 0,2 à 5% d'étain.
7. Alliage coulé à base de cuivre se laissant bien travailler à chaud, caractérisé en ce qu'il possède une première zone de surface externe à ségrégation inverse, une seconde zone interne formant le gros du lingot et une zone dénudée située sous la surface, qui relie la première à la seconde zone et présente une structure à gros grain uniforme et exempte de secondes phases.
8. Alliage coulé selon la revendication 7, caractérisé en ce qu'il est un alliage à base de cuivre contenant du silicium et de l'étain.
9. Alliage coulé selon la revendication 8, caractérisé en ce que la teneur en silicium est de 1 à 6% et la teneur en étain est de 0,2 à 5%.
EP19810103356 1980-05-05 1981-05-04 Procédé de traitement d'alliages à base de cuivre et pièces de moulage en ces alliages, obtenues selon ce procédé Expired EP0039503B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14683380A 1980-05-05 1980-05-05
US146833 1980-05-05

Publications (2)

Publication Number Publication Date
EP0039503A1 EP0039503A1 (fr) 1981-11-11
EP0039503B1 true EP0039503B1 (fr) 1984-03-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810103356 Expired EP0039503B1 (fr) 1980-05-05 1981-05-04 Procédé de traitement d'alliages à base de cuivre et pièces de moulage en ces alliages, obtenues selon ce procédé

Country Status (3)

Country Link
EP (1) EP0039503B1 (fr)
JP (1) JPS571562A (fr)
DE (1) DE3162759D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2246368B (en) * 1990-07-06 1993-10-13 Outokumpu Copper Partner Ab Improvements in or relating to a copper-based alloy
TWI291994B (en) * 2002-11-13 2008-01-01 Sumitomo Electric Industries Copper alloy conductor and the manufacturing method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2066512A (en) * 1934-10-17 1937-01-05 Smith Corp A O Alloy
US4148633A (en) * 1977-10-26 1979-04-10 Olin Corporation Minimization of edge cracking during hot rolling of silicon-tin bronzes

Also Published As

Publication number Publication date
DE3162759D1 (en) 1984-04-26
EP0039503A1 (fr) 1981-11-11
JPS571562A (en) 1982-01-06

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