WO2010112725A1 - Procede de traitement thermique et piece en alliage d'aluminium coulee sous-pression - Google Patents
Procede de traitement thermique et piece en alliage d'aluminium coulee sous-pression Download PDFInfo
- Publication number
- WO2010112725A1 WO2010112725A1 PCT/FR2010/050505 FR2010050505W WO2010112725A1 WO 2010112725 A1 WO2010112725 A1 WO 2010112725A1 FR 2010050505 W FR2010050505 W FR 2010050505W WO 2010112725 A1 WO2010112725 A1 WO 2010112725A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat treatment
- treatment process
- temperature
- parts
- alloy
- Prior art date
Links
Classifications
-
- 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
- C22F1/043—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 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
-
- 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
Definitions
- the present invention relates to a heat treatment process of a die-cast aluminum alloy casting.
- the invention further relates to a die-cast aluminum alloy part then thermally treated, and a vehicle comprising such a treated part.
- aluminum alloy parts are preferred to steel or cast iron parts.
- the aluminum alloy parts are generally obtained by die-casting.
- such pieces of aluminum alloys do not have mechanical properties comparable to those of steel or cast iron. These differences in mechanical properties prevent substitution of all steel or cast iron parts by die-cast aluminum alloy parts.
- WO-A-2006/066314 discloses a heat treatment process of aluminum alloy parts cast under pressure. These parts, by the molding process, are likely to have internal defects in which gases are occluded. These defects are liable to form blisters during a conventional hardening heat treatment.
- the treatment method which is described in the document WO-A-2006/066314 comprises a dissolution step lasting less than 30 minutes. Such a method, however, does not allow a gain in terms of mechanical properties for all aluminum alloy cast parts under pressure.
- the invention provides a heat treatment process of a die-casting aluminum alloy part comprising the steps of dissolving the part in an oven preheated to a temperature below the solidus. alloy; tempering the room and tempering the room; characterized in that during the dissolving step, the workpiece is maintained at an isothermal temperature for a duration of at least 10 minutes.
- the invention makes it possible to obtain mechanical properties for parts made of aluminum alloys approaching those of other materials such as steel or cast iron.
- the furnace used in the dissolution step has a heat transfer coefficient greater than 300 Wm -2 .K -1 , preferably between 500 and 1800 Wm -2 .K -1 , and more particularly between 500 and 700 Wm -2 .K -1 .
- the oven used in the dissolving step is a furnace selected from the group comprising a fluidized bed furnace, a salt bath furnace, a lead-bath furnace and a bath furnace. oil.
- the dissolution step has a duration of less than 45 minutes, preferably less than 30 minutes.
- the furnace used in the dissolution step is at a temperature between 20 ° C and 150 ° C below the solidus of the alloy.
- the quenching step of the part is carried out from the dissolution temperature of the alloy at a temperature between 0 ° C and 100 ° C.
- the tempering step of the quenched part is carried out at a temperature between 130 ° C. and 200 ° C. for a few hours.
- the part is made of aluminum alloy, preferably of the type AISi9Cu3Mg (Fe) (Zn).
- the subject of the present invention is also an aluminum alloy part obtained by die-casting, characterized in that it is then heat-treated by the heat treatment process defined above.
- the piece has a mass greater than 500g, preferably between 500g and 15kg.
- the part is selected from the group comprising housings with ferrous inserts such as crankshaft bearing housings.
- the invention relates to a vehicle comprising at least one such aluminum alloy part.
- the heat treatment process firstly contains a step of dissolving the piece in an oven.
- the solution furnace is maintained at a temperature below the solidus of the alloy.
- the piece is then kept at an isothermal temperature for a period of at least 10 minutes.
- the dissolution step is followed by a quenching step of the workpiece.
- the quenching step of the piece is followed by a step of the coin's return.
- This heat treatment provides mechanical properties for aluminum alloy parts approaching those of other materials such as steel or cast iron.
- This method also allows to replace the presence of ferrous inserts in parts already made of aluminum alloy but insufficiently resistant. Of these parts are then completely replaced by heat-treated aluminum alloy parts according to the method. The replacement of parts with inserts with parts entirely made of aluminum alloy makes it possible to reduce the mass of these parts.
- the method is proposed for parts made of aluminum alloys.
- the aluminum alloy parts advantageously replace the iron alloy parts for a purpose of lightness.
- the method is further provided for underpressure casting.
- Die casting is a preferred method for bulk and low cost production of parts having good dimensional accuracy.
- the heat treatment process comprises a dissolution step. This dissolution is carried out in an oven at a temperature below the solidus of the alloy. The lower dissolution temperature of the solidus of the alloy avoids the melting of the part during the heat treatment.
- a piece obtained by die casting can have defects in its raw state of foundry.
- the dissolution step further causes a solid solution of the alloying elements of the molded part.
- Solid dissolution makes it possible, for example, to dissolve various addition elements, which make up the aluminum alloy. The piece is left in the solution furnace for the time necessary to obtain the desired structure and homogenization of the aluminum alloy.
- This isothermal holding time allows a homogeneous thermal configuration of the workpiece.
- This homogeneous thermal configuration of the part makes possible a uniform improvement of the mechanical properties of the alloy of the part.
- the uniformity of the mechanical properties of the alloy results in an improvement in the mechanical properties of the part as a whole.
- the dissolution step is followed by a quenching step of the workpiece.
- This quenching is a brutal cooling of the room. Such a sudden cooling makes it possible to freeze the particular structure obtained during dissolution.
- the combination of dissolution and quenching ultimately provides a special structure for the aluminum alloy part. Such a combination makes it possible for example to maintain at room temperature a solid solution of aluminum alloy supersaturated with additive elements. Such a supersaturated solution is normally metastable at room temperature. This particular structure obtained serves as a base state for another step of the heat treatment.
- the heat treatment process finally comprises a maturation step or income.
- a quenched aluminum alloy piece has low mechanical properties.
- the income stage makes it possible to obtain an improvement in the mechanical properties of this part.
- the income stage can be performed at room temperature (maturation).
- the income step can be further performed according to the heat treatment of type T6, that is to say that the income makes it possible to obtain the optimal mechanical properties.
- the die-casting of aluminum alloy parts causes the formation of defects inside the parts .. In these defects can be occluded air type gases or decomposition residues of the poteyage.
- the gases present in these occlusions are dilated.
- the expansion of the gases can then cause the deformation of the outer wall of the parts by the formation of blisters. For example from a temperature of 400 ° C, the strength of some aluminum alloys can be weakened enough does not prevent the formation of blisters.
- the solution step is carried out in an oven having a better heat transfer coefficient than conventional air furnaces.
- furnaces whose heat transfer coefficient is greater than 300 Wm -2 .K -1 .
- the use of a furnace with a thermal coefficient greater than 300 W.m- 2 K.sub.- 1 makes it possible to increase the temperature of the part faster during the solution-settling phase, resulting in a low risk of blistering. .
- Such a faster rise in temperature leads to a decrease in the total charging time during the dissolution stage.
- the dissolution step is then shorter while leaving an isothermal holding time of the upper piece to 10 minutes. Maintaining the minimum isothermal holding time makes it possible to ensure the improvement of the mechanical properties.
- a solution furnace with a heat transfer coefficient between 500 and 1800 Wm “2 .K " 1 will be used .
- the use of such an oven allows an even faster temperature rise of the room during the dissolution.
- furnaces with a thermal transfer coefficient of between 500 and 700 W. m- 2 K -1 .
- Such specific furnaces are for example fluidized bed furnaces.
- a preheated oven will be used at the desired solution dissolution temperature.
- the dissolution time will be the total duration of charging of the part in the solution furnace.
- the duration of the dissolution step is less than 45 minutes.
- the dissolution step can be reduced to 30 minutes.
- Such a reduction in the duration of this step makes it possible to heat-treat underpressure castings which have a poor internal health, that is to say parts with a larger number of defects containing gases. It is therefore useful to provide a shorter dissolution time for these parts which present a greater risk of blistering during the heat treatment.
- the temperature of completion of the dissolution step is preferably between 20 ° C and 150 ° C below the solidus of the alloy.
- the dissolution temperature above 150 ° C below the solidus of the alloy allows an improvement in mechanical properties and a good homogenization of the room.
- Such a dissolution temperature also makes it possible to obtain the improvement of the mechanical properties and / or the desired homogenization with a duration of the relatively short dissolution stage.
- the solution temperature lower than the temperature of 20 ° C below the solidus of the alloy avoids the formation of burns at the level of the alloy. Indeed, if the solution temperature is too close to the solidus, the alloy can reach a partial melting temperature of one of the constituents of the alloy. These burns alter the mechanical properties of the alloy and therefore the part made in such an alloy. Such a limitation of the temperature of the dissolution of the alloy also makes it possible to prevent the formation of blisters which is too rapid due to a greater expansion of the gases present in the part.
- the quenching step may be performed using a quenching fluid.
- the quenching step is preferably carried out at the temperature of dissolution of the alloy at a temperature between 0 ° C and 100 ° C. Quenching at a temperature between 0 ° C and 100 ° C allows better freezing of the structure obtained during the dissolution.
- the use of a quenching temperature between 0 ° C. and 100 ° C. also makes it possible to use water as a quenching fluid.
- the use of water is preferable to a quenching fluid such as oil or water additivée. Indeed the use of water as a quenching fluid leads to an improvement in the costs of the quenching step. Then the use of water as a quenching fluid also allows better compliance with environmental constraints.
- the tempering step of the quenched part is preferably carried out at a temperature between 130 ° C and 200 ° C.
- This range of tempering temperature allows a faster improvement of the mechanical properties of the alloy than maturation performed at room temperature.
- this temperature range is limited to 200 ° C to prevent excessive expansion of the gases contained in the alloy.
- the use of this temperature range allows an improvement of sufficient mechanical properties without the risk of seeing blistering on the returned coin.
- the aluminum alloy is preferably of the family of Aluminum Silicon.
- the aluminum alloys of the aluminum silicon family have particularly blistering problems during heat treatment. Indeed the presence of Si induces during heat treatment a particularly rapid globulization. This rapid globulization of Si particles prevents the use of conventional heat treatments of aluminum alloy.
- the heat treatment process described above is therefore particularly suitable for aluminum alloy parts of the aluminum silicon family.
- the use of the heat treatment process is also particularly advantageous for aluminum alloys of the type AISi9Cu3Mg (Fe) (Zn). Indeed, such alloys are alloys having good intrinsic mechanical properties. Alloys of this type are also alloys whose manufacturing cost is economical.
- an aluminum alloy part obtained by heat-treated die-casting under the previously described heat treatment method is then proposed.
- the use of these parts treated according to the method described above allows the replacement of parts generally made of iron alloy, for example steel or cast iron.
- the whole of the die-cast aluminum alloy part treated in this way benefits from the increase in mechanical properties. It is thus also possible to locally reduce the thicknesses of the part while keeping the same resistance at the level of the structure.
- the gain in lightening the aluminum alloy parts thus treated may be of the order of several kilograms. In the end, these treated pieces allow a gain in mass for mechanical properties approaching those of ferrous materials.
- the parts will be massive parts, that is to say parts whose mass is greater than 500g. Indeed the more the parts are massive and the more it is useful to seek to gain mass when designing such parts.
- the process described above is particularly suitable for massive parts in that it provides isothermal holding of the part for a period of at least 10 minutes. These massive pieces have greater minimum thicknesses than lighter pieces. These larger thicknesses generally prevent obtaining an isothermal holding of the entire room during the dissolution phases. This isothermal holding of the part is then difficult to obtain when applying the conventional heat treatments to massive parts.
- the treated parts are preferably parts with a mass of less than 15kg allowing the use of known furnace without requiring an adaptation of these particular furnaces to parts of too large mass and / or too large.
- the heat-treated parts according to the method described above are in particular the parts subjected to demanding criteria during mechanical dimensioning.
- the heat-treated parts according to the method previously cited then have the mechanical properties sufficient to allow economic design.
- the treated parts are parts of the crankcase type bearing crankshaft bearings, whose static dimensioning and fatigue is particularly sought after. These pieces can be made mainly aluminum alloy for light weight issues. However, some parts of these parts are subject to such constraints that we may prefer the addition of ferrous inserts on these places.
- the use of aluminum alloy parts treated according to the invention then makes it possible to dispense with the use of ferrous inserts in this type of parts. The production of these parts is then facilitated in terms of time and cost of manufacture.
- the crankshaft bearing housing casings have in operation risk areas such as the crankshaft bearing area.
- ferrous inserts cast iron or sintered steel inserted in the casting is then avoided resulting in gains in weight and price of the piece.
- Increasing the mechanical properties of the aluminum alloy replacing the ferrous inserts in the crankshaft bearing housings is also beneficial to the other mechanically stressed areas of the workpiece.
- a vehicle comprising one or parts made of aluminum alloy cast under pressure is a vehicle whose time and manufacturing costs are reduced.
- such a vehicle is lighter and therefore has a more economical consumption.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010800247042A CN102803532A (zh) | 2009-04-02 | 2010-03-22 | 热处理工艺和压铸铝合金部件 |
EP10716561A EP2414555A1 (fr) | 2009-04-02 | 2010-03-22 | Procede de traitement thermique et piece en alliage d'aluminium coulee sous-pression |
BRPI1006500A BRPI1006500A2 (pt) | 2009-04-02 | 2010-03-22 | processo de tratamento térmico; peça em liga de alumínio fundida sob pressão e veiculo |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0952133 | 2009-04-02 | ||
FR0952133A FR2944030B1 (fr) | 2009-04-02 | 2009-04-02 | Procede de traitement thermique et piece en alliage d'aluminium coulee sous-pression |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010112725A1 true WO2010112725A1 (fr) | 2010-10-07 |
Family
ID=40874841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2010/050505 WO2010112725A1 (fr) | 2009-04-02 | 2010-03-22 | Procede de traitement thermique et piece en alliage d'aluminium coulee sous-pression |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2414555A1 (fr) |
CN (1) | CN102803532A (fr) |
BR (1) | BRPI1006500A2 (fr) |
FR (1) | FR2944030B1 (fr) |
WO (1) | WO2010112725A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2994194A1 (fr) * | 2012-08-01 | 2014-02-07 | Peugeot Citroen Automobiles Sa | Procede de traitement thermique d'une piece en alliage d'aluminium |
CN104105565A (zh) * | 2011-09-27 | 2014-10-15 | 斯奈克玛 | 利用脉冲电流和脉冲填充焊丝的mig法对铝制金属部件进行焊接和沉积的方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180320259A1 (en) * | 2017-05-02 | 2018-11-08 | GM Global Technology Operations LLC | Method of increasing tensile strength of aluminum castings |
CN110042277A (zh) * | 2019-05-07 | 2019-07-23 | 东莞市石碣华丰金属有限公司 | 一种压铸锌铝合金配方及其制作工艺 |
CN112553509A (zh) * | 2020-11-13 | 2021-03-26 | 泰州市天宇交通器材有限公司 | 一种用于动力转向泵支架的合金铸造工艺 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2588017A1 (fr) * | 1985-09-27 | 1987-04-03 | Ube Industries | Alliage d'aluminium |
JPH1129843A (ja) * | 1997-07-09 | 1999-02-02 | Hitachi Metals Ltd | アルミダイカスト品の熱処理方法 |
EP1253210A1 (fr) * | 2001-03-28 | 2002-10-30 | Honda Giken Kogyo Kabushiki Kaisha | Matériau à base Al résistant à la chaleur, coulé sous pression |
US20040011437A1 (en) * | 2002-02-28 | 2004-01-22 | Lin Jen C. | AI-Si-Mg-Mn casting alloy and method |
WO2006066314A1 (fr) * | 2004-12-23 | 2006-06-29 | Commonwealth Scientific And Industrial Research Organisation | Traitement thermique d'articles coules en alliage d'aluminium, moules sous haute pression |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001316747A (ja) * | 1999-08-31 | 2001-11-16 | Asahi Tec Corp | 非Cu系鋳造Al合金とその熱処理方法 |
US20040011434A1 (en) * | 2000-08-08 | 2004-01-22 | Takayuki Sakai | Aluminum alloy formed by precipitation hardening and method for heat treatment thereof |
JP2002275567A (ja) * | 2001-03-19 | 2002-09-25 | Asahi Tec Corp | 析出硬化型Al合金、及び、析出硬化型合金の熱処理方法 |
-
2009
- 2009-04-02 FR FR0952133A patent/FR2944030B1/fr not_active Expired - Fee Related
-
2010
- 2010-03-22 CN CN2010800247042A patent/CN102803532A/zh active Pending
- 2010-03-22 EP EP10716561A patent/EP2414555A1/fr not_active Withdrawn
- 2010-03-22 WO PCT/FR2010/050505 patent/WO2010112725A1/fr active Application Filing
- 2010-03-22 BR BRPI1006500A patent/BRPI1006500A2/pt not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2588017A1 (fr) * | 1985-09-27 | 1987-04-03 | Ube Industries | Alliage d'aluminium |
JPH1129843A (ja) * | 1997-07-09 | 1999-02-02 | Hitachi Metals Ltd | アルミダイカスト品の熱処理方法 |
EP1253210A1 (fr) * | 2001-03-28 | 2002-10-30 | Honda Giken Kogyo Kabushiki Kaisha | Matériau à base Al résistant à la chaleur, coulé sous pression |
US20040011437A1 (en) * | 2002-02-28 | 2004-01-22 | Lin Jen C. | AI-Si-Mg-Mn casting alloy and method |
WO2006066314A1 (fr) * | 2004-12-23 | 2006-06-29 | Commonwealth Scientific And Industrial Research Organisation | Traitement thermique d'articles coules en alliage d'aluminium, moules sous haute pression |
Non-Patent Citations (2)
Title |
---|
APELIAN D ET AL: "Fluidized bed heat treatment of aluminum cast components", JOURNAL DE PHYSIQUE IV, EDITIONS DE PHYSIQUE. LES ULIS CEDEX, FR, vol. 120, 1 January 2004 (2004-01-01), pages 555 - 562, XP009111067, ISSN: 1155-4339 * |
LUMLEY R N ET AL: "HEAT TREATMENT OF HIGH-PRESSURE DIE CASTINGS", METALLURGICAL AND MATERIALS TRANSACTIONS A: PHYSICAL METALLURGY & MATERIALS SCIENCE, ASM INTERNATIONAL, MATERIALS PARK, OH, US, vol. 38A, no. 10, 1 October 2007 (2007-10-01), pages 2564 - 2574, XP001508189, ISSN: 1073-5623 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104105565A (zh) * | 2011-09-27 | 2014-10-15 | 斯奈克玛 | 利用脉冲电流和脉冲填充焊丝的mig法对铝制金属部件进行焊接和沉积的方法 |
CN104105565B (zh) * | 2011-09-27 | 2017-03-08 | 斯奈克玛 | 利用脉冲电流和脉冲填充焊丝的mig法对铝制金属部件进行焊接和沉积的方法 |
FR2994194A1 (fr) * | 2012-08-01 | 2014-02-07 | Peugeot Citroen Automobiles Sa | Procede de traitement thermique d'une piece en alliage d'aluminium |
Also Published As
Publication number | Publication date |
---|---|
BRPI1006500A2 (pt) | 2018-02-14 |
FR2944030A1 (fr) | 2010-10-08 |
FR2944030B1 (fr) | 2012-10-26 |
CN102803532A (zh) | 2012-11-28 |
EP2414555A1 (fr) | 2012-02-08 |
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