EP0328898A1 - Procédé pour la fabrication d'une pièce résistant à la chaleur d'une ébauche réalisée par métallurgie des poudres à ductibilité transversale élevée en alliage d'aluminium - Google Patents

Procédé pour la fabrication d'une pièce résistant à la chaleur d'une ébauche réalisée par métallurgie des poudres à ductibilité transversale élevée en alliage d'aluminium Download PDF

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Publication number
EP0328898A1
EP0328898A1 EP89101063A EP89101063A EP0328898A1 EP 0328898 A1 EP0328898 A1 EP 0328898A1 EP 89101063 A EP89101063 A EP 89101063A EP 89101063 A EP89101063 A EP 89101063A EP 0328898 A1 EP0328898 A1 EP 0328898A1
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EP
European Patent Office
Prior art keywords
strand
powder
section
semi
plane
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.)
Withdrawn
Application number
EP89101063A
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German (de)
English (en)
Inventor
Malcolm Dr. Couper
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.)
ABB Asea Brown Boveri Ltd
ABB AB
Original Assignee
ABB Asea Brown Boveri Ltd
Asea Brown Boveri AB
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 ABB Asea Brown Boveri Ltd, Asea Brown Boveri AB filed Critical ABB Asea Brown Boveri Ltd
Publication of EP0328898A1 publication Critical patent/EP0328898A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/001—Extruding metal; Impact extrusion to improve the material properties, e.g. lateral extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding

Definitions

  • Body made of heat-resistant aluminum alloys, which are made from powders obtained at high cooling rates by atomizing a melt. High content of alloy components not permitted under the usual solidification conditions, e.g. Fe, Cr and V.
  • the invention relates to the production of moldings with improved mechanical properties based on aluminum alloys.
  • it relates to a method for producing a heat-resistant workpiece with a high cross-ductility made of an aluminum alloy from powder-metallurgically produced semifinished product, wherein alloy powder of the final composition or a mixture of master alloy powders is first cold isostatically pressed under a pressure of 1500 to 5000 bar and in this way generated Pressing bolts in the recipient of an extrusion press are re-compressed by hot pressing and immediately extruded into a semi-finished product, and a piece is cut off from the semi-finished product for further shaping.
  • FIG. 1 shows a perspective illustration of a compression process.
  • the aluminum alloy powder becomes a compact body 1 in a press condensed.
  • the pressure forces applied on the outside are indicated by arrows.
  • bodies 1 are manufactured by hot pressing and are generally cylindrical in shape.
  • a first process step can also consist of cold pressing or cold isostatic compression (not shown!).
  • 2 relates to a perspective view of an extrusion process.
  • the compressive forces acting from the outside are again indicated by arrows which coincide with the extrusion direction and the longitudinal axis of the body.
  • 2 is the partially pressed extrusion bolt with the usual cylindrical shape.
  • 3 is the resulting extruded strand with a generally circular cross section.
  • 4 illustrates a cylindrical rod section.
  • FIG. 3 shows a perspective illustration of a compression process.
  • the elongated cylindrical rod section 4 shown in broken lines is deformed by axial compressive forces (indicated by arrows) to form a forged cylindrical blank 5 in the form of a flat disk.
  • FIG. 4 relates to a perspective view of a forging process.
  • the blank 5 (not shown) (FIG. 3) is deformed by further process steps (compressive forces indicated by dashed arrows) to form a drop-forged finished rotary body 6.
  • the deformation takes place practically uniaxially in all process steps, ie in the direction of the original compressive forces during the first compression (FIG. 1) or in the extrusion direction (FIG. 2).
  • the finished workpiece turns out to be strongly anisotropic and the mechanical to be very different in the different directions Has properties.
  • Powder metallurgically manufactured high-temperature alloys are generally difficult to deform. Because of their low ductility at the comparatively low forging temperature, the mold filling capacity is poor and the susceptibility to cracking is high. If you omit the step of the strand process, the deformation is insufficient. The ductility in all directions is very low.
  • the ductility in the longitudinal direction meets the requirements, but it is very low across the extrusion direction.
  • the main stress in operation falls in the plane that is perpendicular to the extrusion and compression direction.
  • the ductility varies considerably from core to edge. The body behaves anisotropically, which hinders its maximum utilization in operation. Two examples may demonstrate this:
  • the powder was filled into an aluminum capsule, degassed by heating under vacuum and compacted in a mold by uniaxial hot pressing.
  • the aluminum capsule was removed mechanically and the workpiece was forged by swaging it into a flat pancake-like disc with a diameter of 120 mm and a height of 50 mm.
  • Test pieces were cut out of the disk and subjected to a mechanical test at room temperature.
  • strain values in the core are insufficient in all three directions, which is all the more serious since, as is well known, the center of a rotating body is subjected to the greatest stress during rotation during operation.
  • the powder was filled into an aluminum capsule according to Example A and hot-pressed under vacuum.
  • the workpiece was inserted as a press bolt in an extrusion press and pressed into a rod with a reduction ratio of 10: 1.
  • a rod section was drop-forged into a pancake-like disk 100 mm in diameter and 45 mm in height.
  • the core strain values are still poor in all three directions.
  • the ductility only meets the requirements at the edge.
  • the invention has for its object to provide a method for producing a heat-resistant workpiece from an aluminum alloy powder metallurgical production, the workpiece should have a high cross-ductility and uniform strength properties in all three main directions.
  • the ductility measured in the tensile test as elongation in the main stress level (level of the main stress directions during operation) should be at least 5%.
  • the process should possibly do without the delicate, critical forging operations given the susceptibility to cracking of the material.
  • a strand with a rectangular cross section is pressed as a semi-finished product while maintaining a reduction ratio of at least 6: 1, from which a disc-shaped prismatic rod section is converted into the end product without further hot deformation merely by mechanical processing, whereby care is taken to ensure that the main mechanical stress directions of the end product lie in a plane which is parallel to the plane which is spanned by the extrusion direction and the longitudinal axis of the cross section of the strand.
  • FIG. 5 shows a perspective illustration of a compression process.
  • the compressive forces are indicated by arrows.
  • the compression is usually carried out under vacuum and usually in a thin-walled aluminum capsule as a casing.
  • the pressure forces are indicated by arrows. Their direction coincides with the longitudinal axis of the strand and the direction of extrusion.
  • the extrusion bolt 2 is already partially pressed.
  • 7 is the pressed strand with a rectangular cross section
  • 8 is a prismatic rod section of the strand 7.
  • Fig. 7 shows a perspective view of a mechanical rough machining (roughing).
  • the prismatic rod section 8 is indicated by dashed lines.
  • the rod section 8 is subjected to a first shaping step (represented by turning) with the mechanical processing tool 9.
  • the machining is carried out so that the axis is perpendicular to the extrusion direction during the turning process: radial plane parallel to the main plane of symmetry (plane of the largest surface of the prism) of the rod section 8. In this way, a mechanically machined cylindrical blank 10 is initially produced.
  • the mechanical processing tool 9 (in the present case a turning tool) gives the blank (10 in FIG. 7) the final shape. 11 is the finished offset rotary body produced by mechanical processing (finishing).
  • a rotationally symmetrical workpiece for a compressor was made from a heat-resistant aluminum alloy.
  • the alloy was melted and atomized into powders with a grain size of 5 to 70 ⁇ m.
  • the powder was filled into a rubber tube, degassed and compressed isostatically under a pressure of 3000 bar.
  • the cold-compressed compact 1 had a diameter of 380 mm and a height of 500 mm. It was hot compressed under a pressure of 4000 bar and then used as an extrusion bolt 2.
  • a prismatic rod section 8 of 160 mm in length was cut out of the strand 7. This was initially followed by Roughing with the mechanical processing tool 9 produces a cylindrical blank 10 and then a finished, stepped rotary body 11 by finishing.
  • a rotationally symmetrical workpiece for a thermal machine was made from a heat-resistant aluminum alloy.
  • the alloy was melted and atomized into powder with a particle size of 4 to 65 ⁇ m.
  • the powder was filled into a thin-walled capsule made of soft aluminum with a diameter of 275 mm and a height of 300 mm and was hot-compressed to a compact 1 without degassing by uniaxial pressure.
  • the reduction ratio was 10: 1.
  • a prismatic rod section 8 of 120 mm in length was cut out of the strand 7 and a blank 10 and finally a finished rotating body 11 were produced therefrom according to Example 1.
  • the ductility was practically the same in the core as in the edge area of the workpiece.
  • the invention is not restricted to the exemplary embodiments. In principle, it can be applied to any heat-resistant aluminum alloy produced by powder metallurgy. Alloy powder of the final composition or a mixture of master alloy powders are first cold isostatically pressed under a pressure of 1500 to 5000 bar and the pressing bolt (2) thus produced is further compressed in the recipient of an extruder by hot pressing and then extruded into a semi-finished product. Then a piece is cut from the semi-finished product for further shaping. A strand (7) with a rectangular cross-section is pressed as a semi-finished product, while maintaining a reduction ratio of at least 6: 1, from which a disc-shaped prismatic rod section (8) is separated and, without further hot deformation, is only converted into the end product by mechanical processing. Care is taken to ensure that the main mechanical stress directions of the end product lie in a plane which is parallel to the plane which is spanned by the extrusion direction and the longitudinal axis of the cross section of the strand (7).
  • the main advantage of the process lies in the considerable increase in ductility in the plane in which the main stress falls during operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Forging (AREA)
EP89101063A 1988-02-08 1989-01-21 Procédé pour la fabrication d'une pièce résistant à la chaleur d'une ébauche réalisée par métallurgie des poudres à ductibilité transversale élevée en alliage d'aluminium Withdrawn EP0328898A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH429/88A CH675089A5 (fr) 1988-02-08 1988-02-08
CH429/88 1988-02-08

Publications (1)

Publication Number Publication Date
EP0328898A1 true EP0328898A1 (fr) 1989-08-23

Family

ID=4186819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89101063A Withdrawn EP0328898A1 (fr) 1988-02-08 1989-01-21 Procédé pour la fabrication d'une pièce résistant à la chaleur d'une ébauche réalisée par métallurgie des poudres à ductibilité transversale élevée en alliage d'aluminium

Country Status (4)

Country Link
US (1) US4921664A (fr)
EP (1) EP0328898A1 (fr)
JP (1) JPH024904A (fr)
CH (1) CH675089A5 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3919107A1 (de) * 1988-08-02 1990-02-08 Asea Brown Boveri Verfahren zur formgebung und verbesserung der mechanischen eigenschaften von pulvermetallurgisch hergestellten rohlingen aus einer legierung mit erhoehter warmfestigkeit durch strangpressen
US6010583A (en) * 1997-09-09 2000-01-04 Sony Corporation Method of making unreacted metal/aluminum sputter target
DE10135485A1 (de) * 2001-07-20 2003-02-06 Schwaebische Huettenwerke Gmbh Verfahren zur endkonturnahen Fertigung von Bauteilen bzw. Halbzeugen aus schwer zerspanbaren Leichtmetalllegierungen, und Bauteil bzw. Halbzeug, hergestellt durch das Verfahren
US10240419B2 (en) 2009-12-08 2019-03-26 Baker Hughes, A Ge Company, Llc Downhole flow inhibition tool and method of unplugging a seat
US9707739B2 (en) 2011-07-22 2017-07-18 Baker Hughes Incorporated Intermetallic metallic composite, method of manufacture thereof and articles comprising the same
US9033055B2 (en) 2011-08-17 2015-05-19 Baker Hughes Incorporated Selectively degradable passage restriction and method
US9090956B2 (en) 2011-08-30 2015-07-28 Baker Hughes Incorporated Aluminum alloy powder metal compact
US9010416B2 (en) 2012-01-25 2015-04-21 Baker Hughes Incorporated Tubular anchoring system and a seat for use in the same
US9816339B2 (en) 2013-09-03 2017-11-14 Baker Hughes, A Ge Company, Llc Plug reception assembly and method of reducing restriction in a borehole
US11167343B2 (en) 2014-02-21 2021-11-09 Terves, Llc Galvanically-active in situ formed particles for controlled rate dissolving tools
WO2015127174A1 (fr) 2014-02-21 2015-08-27 Terves, Inc. Système métallique de désintégration à activation par fluide
US10689740B2 (en) 2014-04-18 2020-06-23 Terves, LLCq Galvanically-active in situ formed particles for controlled rate dissolving tools
US10888926B2 (en) 2014-11-26 2021-01-12 Schlumberger Technology Corporation Shaping degradable material
US10378303B2 (en) 2015-03-05 2019-08-13 Baker Hughes, A Ge Company, Llc Downhole tool and method of forming the same
US10221637B2 (en) 2015-08-11 2019-03-05 Baker Hughes, A Ge Company, Llc Methods of manufacturing dissolvable tools via liquid-solid state molding
US10016810B2 (en) 2015-12-14 2018-07-10 Baker Hughes, A Ge Company, Llc Methods of manufacturing degradable tools using a galvanic carrier and tools manufactured thereof
CA3012511A1 (fr) 2017-07-27 2019-01-27 Terves Inc. Composite a matrice metallique degradable
CN112496318B (zh) * 2020-11-13 2022-06-10 如东联亿机电有限公司 一种冷挤压防爆铝壳的自动生产线

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019569A1 (fr) * 1979-05-16 1980-11-26 Cegedur Societe De Transformation De L'aluminium Pechiney Corps creux composite et procédé de fabrication
EP0022688A1 (fr) * 1979-07-03 1981-01-21 Jean Gachot Procédé pour la fabrication d'un piston et pistons en résultant
EP0133144A1 (fr) * 1983-07-21 1985-02-13 Cegedur Societe De Transformation De L'aluminium Pechiney Procédé d'obtention à partir de poudre d'alliage d'aluminium à haute résistance de demi-produits filés

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4435213A (en) * 1982-09-13 1984-03-06 Aluminum Company Of America Method for producing aluminum powder alloy products having improved strength properties
EP0144898B1 (fr) * 1983-12-02 1990-02-07 Sumitomo Electric Industries Limited Alliages d'aluminium et procédé pour leur fabrication
BR8406548A (pt) * 1983-12-19 1985-10-15 Sumitomo Electric Industries Liga de aluminio reforcada por dispersao e resistente ao calor e ao desgaste e processo para a sua producao

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019569A1 (fr) * 1979-05-16 1980-11-26 Cegedur Societe De Transformation De L'aluminium Pechiney Corps creux composite et procédé de fabrication
EP0022688A1 (fr) * 1979-07-03 1981-01-21 Jean Gachot Procédé pour la fabrication d'un piston et pistons en résultant
EP0133144A1 (fr) * 1983-07-21 1985-02-13 Cegedur Societe De Transformation De L'aluminium Pechiney Procédé d'obtention à partir de poudre d'alliage d'aluminium à haute résistance de demi-produits filés

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Publication number Publication date
CH675089A5 (fr) 1990-08-31
US4921664A (en) 1990-05-01
JPH024904A (ja) 1990-01-09

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