US20180002788A1 - Process for obtaining a low silicon aluminium alloy part - Google Patents

Process for obtaining a low silicon aluminium alloy part Download PDF

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Publication number
US20180002788A1
US20180002788A1 US15/544,213 US201615544213A US2018002788A1 US 20180002788 A1 US20180002788 A1 US 20180002788A1 US 201615544213 A US201615544213 A US 201615544213A US 2018002788 A1 US2018002788 A1 US 2018002788A1
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United States
Prior art keywords
range
content
alloy
preform
casting
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Abandoned
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US15/544,213
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English (en)
Inventor
Romain Epale
Emile Thomas Di Serio
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Saint Jean Industries SAS
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Saint Jean Industries SAS
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Assigned to SAINT JEAN INDUSTRIES reassignment SAINT JEAN INDUSTRIES ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DI SERIO, EMILE THOMAS, EPALE, ROMAIN
Publication of US20180002788A1 publication Critical patent/US20180002788A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B21J5/002—Hybrid process, e.g. forging following casting
    • 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
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04—Modified aluminium-silicon alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions

Definitions

  • the invention relates to the technical field of foundry work or casting, for manufacturing aluminum parts, in particular in the automobile and aviation sectors, and more generally in all types of industry.
  • alloys exist that are said to be “low-silicon” alloys. Such alloys have high mechanical characteristics after T6 heat treatment (Rp 0.2 of 300 MPa; A % of 8%). They are grouped together in the 6000 (Al—Mg—Si) series in the classification of aluminum alloys. The most well known are the 6082, 6061, and 6151. Numerous compositions also exist with contents similar to the standardized alloys, among which mention can be made, for example, of Document EP 0 987 344.
  • the above-mentioned alloys have been developed for obtaining semi-finished products (billets or ingots for forging or rolling) designed to be transformed during hot or cold operations with high deformation rates (>50%).
  • the geometrical shapes of such semi-finished products are simple (bar, rod, or ingot), thereby making it possible to solidify such alloys with defects being minimized, by using methods having high solidification speeds.
  • Such geometrical shapes and such methods result, using techniques that are currently mastered, to semi-finished products that are exempt from defects, such defects being, for example: shrink holes, cracks, macro-segregations, and macro-precipitations (formation of precipitates that are too coarse, >100 ⁇ m).
  • the problem posed that the invention proposes to solve is to make it possible to obtain parts that satisfy high safety and quality standards, and that can be of complex shapes.
  • the invention provides a method of manufacturing a part made of low-silicon aluminum alloy of the 6000 type.
  • the invention provides a method of obtaining a part made of low-silicon aluminum alloy, containing silicon at a content lying in the range 0.5% to 3%, magnesium at a content lying in the range 0.65% to 1%, copper at a content lying in the range 0.20% to 0.40%, manganese at a content lying in the range 0.15% to 0.25%, titanium at a content lying in the range 0.10% to 0.20%, and strontium at a content lying in the range 0 ppm to 120 ppm, said method including:
  • the present invention also provides:
  • the preform after the preform has been cooled, it is reheated by being placed in a tunnel furnace.
  • the casting operation followed by the forging of the preform in one step do not have the same parameters as regards temperatures, solidification speed, rate of deformation, and forge temperature as the methods in the state of the prior art.
  • the silicon content lies in the range 0.5% to 3%.
  • a silicon content less than 1% results in the highest yield strengths and elongations.
  • it is the content for which the alloy is the most sensitive to cracking and has the lowest castability or fluidity. It is therefore necessary to be able to adapt the silicon content as a function of the geometrical shape of the part. Complex geometrical shapes require a higher content so as to reduce this sensitivity to cracking.
  • the maximum content of 3% corresponds to the content beyond which the elongation and the yield strength become too low for it to remain advantageous to produce parts using an alloy of this type.
  • the magnesium content lies in the range 0.65% to 1%. This content makes it possible to optimize the density of Mg 2 Si precipitates in the aluminum matrix. It compensates for the reduction in the silicon content while also minimizing the macroscopic Mg 2 Si precipitates that are damaging and must be dissolved or transformed during the heat treatment. If there are too many precipitates or if they are too big, the heat treatment has only a small effect on their dissolution, since the critical dissolution size is exceeded.
  • the copper content lies in the range 0.20% to 0.40%. This content makes it possible for Al 2 Cu precipitates to be formed in the matrix and for there to be a total absence of macroscopic Al 2 Cu precipitates. The absence of any such macroscopic precipitates makes it possible to maintain high forging temperatures and thereby to minimize the forging forces (forging being performed in a single step).
  • the main precipitates formed in the presence of copper are Al 2 Cu and AlMgSiCu that melt respectively at 490° C. and at 525° C., and their presence would prevent forging at higher temperatures without running the risk of the alloy being burnt, which would make the parts unusable. Such degradation can be likened to the alloy being destroyed.
  • a higher copper content also increases the sensitivity of the alloy to cracking, because there remains a eutectic to be solidified at low temperatures (490° C. or 525° C.) for which the mechanical stresses (related to shrinkage on solidification) exerted on the part are large.
  • the manganese content lies in the range 0.15% to 0.25%. This content avoids AlFeSi precipitates forming in ⁇ form (highly damaging platelet form) and makes it possible rather for AlFeMnSi precipitates to form in a form (less damaging Chinese-script form). This makes it possible to maximize the elongation on the finished part resulting from the Cobapress method. This effect is most often used with larger quantities of manganese and of iron, since these two elements lead to high hardening of the alloy but also to larger precipitates during solidification. Such large precipitates are detrimental to proper elongation.
  • the alloy of the invention is, as indicated, designed for the Cobapress method, in which forging is performed in a single step, and does not involve the large deformations usually encountered in forging, rolling or extrusion. Such large deformations make it possible to fragment the large precipitates and to make them must less damaging, while also maintaining their hardening effect.
  • the impact of the iron-based precipitates on the mechanical characteristics should be minimized as of the casting stage. This is because their morphology is then no longer modified, since single-step forging does not deform the part sufficiently to change their morphology.
  • this manganese content is adapted to the cooling speeds obtained when casting in a permanent mold, and, with regard to such speeds, it facilitates the formation of AlFeMnSi precipitates in a form.
  • the titanium content lies in the range 0.10% to 0.20%. That content is necessary for effective germination of the grains and for a fine grain size that has a large effect on the mechanical characteristics of these alloys.
  • the strontium content lies in the range 0 ppm to 120 ppm. This content is necessary for having a fibrous solidification of the small quantities of eutectic that are formed. This takes place mainly for silicon contents greater than 1 5%.
  • composition of this alloy is adapted to lead to a solidification that makes it possible to maximize the mechanical characteristics in spite of the low levels of deformation encountered during the Cobapress method.
  • solidification defects persist, such as inter-grain shrink-hole solidification defects at the grain joins, with a ramified and diffuse morphology that weakens the casting, i.e. the part resulting from being cast.
  • the Cobapress forging operation makes it possible to re-close and re-bond such defects with the deformation rate being controlled at the design stage.
  • the temperature/deformation pair makes it possible to solve the defects.
  • the table below gives the mechanical characteristics on a casting and on parts, using the Cobapress method, after T6 heat treatment of the low-silicon alloy. It is possible to note the improvement in the ultimate tensile strength Rm and the ultimate elongation:
  • this composition makes it possible to reduce the complexity of the usual heat treatment for alloys of the Al—Mg—Si—Cu type.
  • the silicon content, the solidification speeds and the grain refinement lead to macroscopic Mg 2 Si precipitates that are of size and of morphology that facilitate dissolution during the heat treatment.
  • FIG. 1 shows a casting microstructure, without any manganese, and “needle” precipitates of the ⁇ type
  • FIG. 2 shows the monostructure with manganese, and “Chinese script” precipitates of the a type.
  • FIGS. 3, 4, and 5 show the elimination of the Al 2 Cu copper precipitates.
  • FIGS. 3 and 4 the copper content is greater than 0 40%, which leads to the presence of Al 2 Cu precipitates.
  • FIG. 4 shows an example in which it is possible to observe the AlFeMnSi and Mg 2 Si precipitations surrounded by Al 2 Cu precipitates.
  • FIG. 5 shows a copper content lying in the range 0.20% to 0.40%, in accordance with the invention, showing absence of Al 2 Cu precipitates.

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Forging (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Conductive Materials (AREA)
US15/544,213 2015-01-29 2016-01-14 Process for obtaining a low silicon aluminium alloy part Abandoned US20180002788A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1550700 2015-01-29
FR1550700A FR3032204B1 (fr) 2015-01-29 2015-01-29 Piece en alliage d'aluminium bas silicium
PCT/FR2016/050069 WO2016120541A1 (fr) 2015-01-29 2016-01-14 Procede d'obtention d'une piece en alliage d'aluminium bas silicium

Publications (1)

Publication Number Publication Date
US20180002788A1 true US20180002788A1 (en) 2018-01-04

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US15/544,213 Abandoned US20180002788A1 (en) 2015-01-29 2016-01-14 Process for obtaining a low silicon aluminium alloy part

Country Status (21)

Country Link
US (1) US20180002788A1 (pt)
EP (1) EP3250722B1 (pt)
JP (1) JP6768677B2 (pt)
KR (1) KR20170107458A (pt)
CN (1) CN107208197B (pt)
AU (1) AU2016211088B2 (pt)
BR (1) BR112017016024B1 (pt)
CA (1) CA2973937A1 (pt)
DK (1) DK3250722T3 (pt)
ES (1) ES2689908T3 (pt)
FR (1) FR3032204B1 (pt)
HR (1) HRP20181682T1 (pt)
HU (1) HUE039737T2 (pt)
MA (1) MA41422A (pt)
MX (1) MX2017009828A (pt)
PL (1) PL3250722T3 (pt)
PT (1) PT3250722T (pt)
RS (1) RS57888B1 (pt)
RU (1) RU2700218C2 (pt)
TR (1) TR201815694T4 (pt)
WO (1) WO2016120541A1 (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11708628B2 (en) 2021-03-16 2023-07-25 Honda Motor Co., Ltd. Aluminum alloy processing method and aluminum alloy workpiece

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022142163A (ja) * 2021-03-16 2022-09-30 本田技研工業株式会社 アルミニウム合金の加工方法およびアルミニウム合金の加工物

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119365A1 (fr) * 1983-03-14 1984-09-26 Thomas Di Serio Procédé pour fabriquer des pièces en aluminium ou en alliage d'aluminium
US5571347A (en) * 1994-04-07 1996-11-05 Northwest Aluminum Company High strength MG-SI type aluminum alloy
US20020170635A1 (en) * 1998-05-04 2002-11-21 Diserio Emile-Thomas Process for manufacturing aluminum alloys and aluminium castings
US20030010412A1 (en) * 2001-04-09 2003-01-16 Asahi Tec Corporation Aluminum alloy for casting-forge, and aluminum casting forged product and manufacturing method therefor
US20040151615A1 (en) * 2002-10-01 2004-08-05 Asahi Tec Corporation Cast aluminum alloy for forging, and aluminum cast-forged product and method of manufacturing the same

Family Cites Families (9)

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JPH09272941A (ja) * 1996-04-04 1997-10-21 Nissan Motor Co Ltd 製品予備形状への鋳造を経て製品鍛造に供されるアルミニウム系合金およびその鋳造鍛造方法
JP3346186B2 (ja) * 1996-10-08 2002-11-18 日本軽金属株式会社 耐摩耗性，鋳造性，鍛造性に優れた鋳造・鍛造用アルミ合金材及びその製造法
US6630037B1 (en) * 1998-08-25 2003-10-07 Kobe Steel, Ltd. High strength aluminum alloy forgings
RU2163939C1 (ru) * 1999-08-09 2001-03-10 Государственное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" Сплав на основе алюминия, способ получения полуфабрикатов и изделие из этого сплава
FR2827306B1 (fr) * 2001-07-10 2004-10-22 Pechiney Aluminium Alliage d'aluminium a haute ductilite pour coulee sous pression
DE102004022817A1 (de) * 2004-05-08 2005-12-01 Erbslöh Ag Dekorativ anodisierbare, gut verformbare, mechanisch hoch belastbare Aluminiumlegierung, Verfahren zu deren Herstellung und Aluminiumprodukt aus dieser Legierung
US20080060723A1 (en) * 2006-09-11 2008-03-13 Gm Global Technology Operations, Inc. Aluminum alloy for engine components
CN101855375A (zh) * 2007-11-08 2010-10-06 Ksm铸造有限公司 铸造铝合金
CN101643869B (zh) * 2009-09-04 2011-04-06 河池学院 高强度汽车铝合金轮辋

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119365A1 (fr) * 1983-03-14 1984-09-26 Thomas Di Serio Procédé pour fabriquer des pièces en aluminium ou en alliage d'aluminium
US5571347A (en) * 1994-04-07 1996-11-05 Northwest Aluminum Company High strength MG-SI type aluminum alloy
US20020170635A1 (en) * 1998-05-04 2002-11-21 Diserio Emile-Thomas Process for manufacturing aluminum alloys and aluminium castings
US20040035546A1 (en) * 1998-05-04 2004-02-26 Diserio Emile-Thomas Process for manufacturing aluminum alloys and aluminium castings
US20030010412A1 (en) * 2001-04-09 2003-01-16 Asahi Tec Corporation Aluminum alloy for casting-forge, and aluminum casting forged product and manufacturing method therefor
US20040151615A1 (en) * 2002-10-01 2004-08-05 Asahi Tec Corporation Cast aluminum alloy for forging, and aluminum cast-forged product and method of manufacturing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11708628B2 (en) 2021-03-16 2023-07-25 Honda Motor Co., Ltd. Aluminum alloy processing method and aluminum alloy workpiece

Also Published As

Publication number Publication date
BR112017016024B1 (pt) 2021-10-19
ES2689908T3 (es) 2018-11-16
HUE039737T2 (hu) 2019-01-28
MA41422A (fr) 2017-12-06
CN107208197B (zh) 2019-11-05
BR112017016024A2 (pt) 2018-03-20
PT3250722T (pt) 2018-10-25
AU2016211088A1 (en) 2017-08-17
RS57888B1 (sr) 2019-01-31
FR3032204B1 (fr) 2019-08-09
DK3250722T3 (en) 2018-11-05
EP3250722B1 (fr) 2018-09-12
AU2016211088B2 (en) 2020-05-21
RU2017126680A (ru) 2019-01-28
RU2700218C2 (ru) 2019-09-13
CA2973937A1 (fr) 2016-08-04
MX2017009828A (es) 2018-02-09
CN107208197A (zh) 2017-09-26
RU2017126680A3 (pt) 2019-05-24
KR20170107458A (ko) 2017-09-25
WO2016120541A1 (fr) 2016-08-04
HRP20181682T1 (hr) 2018-12-14
EP3250722A1 (fr) 2017-12-06
FR3032204A1 (fr) 2016-08-05
PL3250722T3 (pl) 2019-03-29
JP2018507324A (ja) 2018-03-15
TR201815694T4 (tr) 2018-11-21
JP6768677B2 (ja) 2020-10-14

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