EP2193213A1 - Aluminum-silicon casting alloy for monolithic cylinder crankcases - Google Patents

Aluminum-silicon casting alloy for monolithic cylinder crankcases

Info

Publication number
EP2193213A1
EP2193213A1 EP20080802663 EP08802663A EP2193213A1 EP 2193213 A1 EP2193213 A1 EP 2193213A1 EP 20080802663 EP20080802663 EP 20080802663 EP 08802663 A EP08802663 A EP 08802663A EP 2193213 A1 EP2193213 A1 EP 2193213A1
Authority
EP
European Patent Office
Prior art keywords
elements
aluminum
silicon
wt
casting alloy
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Withdrawn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
EP20080802663
Other languages
German (de)
French (fr)
Inventor
Bernd Sommer
Eduard Koehler
Herbert Moeding
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.)
KS Huayu Alutech GmbH
Original Assignee
KS Aluminium Technologie GmbH
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
Priority to DE102007046224 priority Critical
Application filed by KS Aluminium Technologie GmbH filed Critical KS Aluminium Technologie GmbH
Priority to PCT/EP2008/008214 priority patent/WO2009043549A1/en
Publication of EP2193213A1 publication Critical patent/EP2193213A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04Modified aluminium-silicon alloys

Abstract

A prior art aluminum-silicon casting alloy for monolithic cylinder crankcases is made of a hypereutectic aluminum-silicon alloy of the AlSi17Cu4Mg type known as Alusil, comprising phases of primary silicon and one or more phases for improving resistance to wear. In an aluminum-silicon alloy according to the invention, the additional phases or mixed crystals are formed by one or more of the following measures: a) adding up to 0.3 percent by weight each of one or more elements from a list I containing at least the elements titanium, vanadium, chromium, cobalt, nickel, and zirconium, up to a maximum of 1.5 percent by weight; b) adding 0.3 to 2.5 percent by weight each of one or more elements from a list II containing at least the elements titanium, vanadium, chromium, (nickel,) and cobalt, up to a maximum of 5 percent by weight; and c) increasing the copper content to a range of 7.0 to 10.0 percent by weight.

Description

 DESCRIPTION

Aluminum-silicon casting alloy for monolithic cylinder crankcases

The invention relates to an aluminum-silicon casting alloy for monolithic cylinder crankcases, which is formed of a hypereutectic aluminum-silicon alloy known as Alusil type AISiI 7Cu4Mg with phases of primary silicon and with one or more additional phases to improve the mechanical properties.

A manufactured by an aluminum-silicon casting alloy cylinder crankcase for an internal combustion engine is known for example from DE 100 32 845 A1. Described is a cylinder block part, which is preferably made in low pressure, squeeze casting or die-casting method of a wear-resistant hypereutectic aluminum-silicon alloy, in particular AISiI 7Cu4Mg as a one-piece monolithic casting.

EP 0 818 271 B1 discloses a method for machining cylinder running surfaces in the manufacture of crankcases made of aluminum alloys. In this case, embedded granular or fibrous hard material phases, in particular silicon, alumina or carbides, are exposed by a honing process in order to produce tribological properties. A composite material technology is used to manufacture the cylinder surfaces, wherein a cylinder-shaped fiber body of AI2O3 short fibers loaded with silicon powder is filled with a hypoeutectic aluminum-silicon alloy in a die casting-like casting process.

An aluminum-silicon alloy for a monolithic aluminum cylinder crankcase for internal combustion engines, in particular highly stressed diesel engines, is known from DE 103 57 096 A1. The cylinder crankcase has a cylinder bore and a bearing block. It's from a hypereutectic see aluminum alloy having the composition AISi17Cu4Mg and a proportion of 0.1 to 2.0 wt .-% nickel and an iron content of about 0.3 wt .-% produced. In the solidified state, the aluminum alloy has a supporting primary silicon phase present in the material structure and a further wear-resistant phase in the form of nickel-copper aluminides. In this case, in the area of the cylinder bore, a more homogeneous distribution of the silicon and in the area of the bearing seat a finer material structure with an average grain size of the primary silicon of 350 μm to 50 μm. A significant difference between the alloy according to the invention and the AISi alloys known from the prior art is that nickel is contained as an additional element.

The object of the invention is an aluminum-silicon casting alloy for monolithic cylinder crankcases, which is formed from a hypereutectic aluminum-silicon alloy known as Alusil type AISi17Cu4Mg with phases of primary silicon and with one or more additional phases to improve the mechanical properties to develop further in terms of mechanical properties.

The object is solved by the features of claim 1. Advantageous embodiments of the invention are described in the subclaims.

In an alloy according to the invention, solid solution hardening or phases are formed by one or more of the following measures: a) adding one or more elements of a list I containing at least the elements titanium, vanadium, chromium, cobalt, nickel and zirconium in a content of up to 0.3% by weight per alloying element up to a maximum of 1.5% by weight in total of the alloying elements by mixed crystal formation, b) adding one or more elements of a list II comprising at least the elements titanium, vanadium, chromium, nickel and cobalt, with a content of 0.3 to 2.5 wt .-% per alloying element to a maximum of 5 wt .-% in total of the alloying elements by phase formation, c) increasing the copper content to 7.0 to 10.0 wt. -% and phase formation.

To improve the mechanical properties of a cylinder crankcase produced from an aluminum-silicon casting alloy according to the invention In accordance with measures a), b) and c), elements are added and / or their share increased.

According to measure a), the aluminum-silicon casting alloy of one or more elements of the list I 1 containing at least the elements titanium, vanadium, chromium, cobalt, nickel and zirconium, in a content of up to 0.3 wt .-% added. This form of adding elements in a small dosage is also called microalloying. The alloying of the elements according to measure a) leads to comparable mechanical properties, such as the wear resistance, the heat resistance and the fatigue strength, a material produced from this referred to as Alusil 3+ -I_egierung invention alloy.

According to measure b), the aluminum-silicon casting alloy of one or more elements of List II, which contains at least the elements titanium, vanadium, chromium and cobalt, in a content of from 0.3 to 2.5 wt .-% up to Sum of the alloying ingredients of 5 wt .-% added. The further binary, ternary and quaternary phases formed by this or these elements are additional hard phases to the primary silicon phase which are exposed during machining of the cylinder treads. The alloying of the elements according to measure b) leads to an improvement in the wear resistance of the cylinder running surfaces of a cylinder crankcase produced from this alloy designated as Alusil 2+ alloy according to the invention.

According to measure c), the copper content of the aluminum-silicon casting alloy is increased to 7.0 to 10.0% by weight. By increasing the copper content, an aluminum-copper phase AI2Cu is formed, which is located exactly in the areas where the primary silicon is less abundant.

The increase in the copper content in accordance with measure c) leads to an improvement in the wear resistance of the cylinder running surfaces of a cylinder crankcase produced from this alloy designated as Alusil opt alloy according to the invention.

In an aluminum-silicon casting alloy according to the invention, two or all three of the measures a), b) and c) can be used in each case. The measures a) and b) are preferably used together and lead both to the improvement of the mechanical characteristics and to the improvement of the Wear resistance of a material produced from this referred to as a super Alusil alloy of the invention alloy.

In one embodiment of an aluminum-silicon alloy according to the invention, the mixed crystals formed according to measure a) with one or more elements of list I are finely distributed. The mixed crystals do not form precipitates or form precipitates that are so small that they are not recognized by light-optical microscopes.

In one embodiment of an aluminum-silicon alloy according to the invention, the phases formed according to measure b) with one or more elements of list II are formed as precipitates having a substantially globular or block-like form.

In one embodiment of an aluminum-silicon casting alloy according to the invention, the phases formed according to measure b) with one or more elements of list II have a microhardness of> 400 HV.

In one embodiment of an aluminum-silicon casting alloy according to the invention, in addition to measure c), in which the copper content is increased to 7.0 to 10.0% by weight, the nickel content is increased to up to 0.5% by weight. Due to the increased nickel content, nickel atoms are deposited in the aluminum-copper phase AI 2 Cu formed by the measure c). As a result, the hardness of this single phase, also called microhardness of the phase and thus the wear resistance is further improved.

In one embodiment of an aluminum-silicon casting alloy according to the invention, the silicon content is increased up to 22.0 wt .-%. Increasing the silicon content increases the proportion of the primary silicon phase. The number of grains of primary silicon is increased. In particular, in one embodiment of an aluminum-silicon casting alloy according to the invention, in which, according to measure c), the copper content is increased to 7.0 to 10.0% by weight, the silicon content is increased up to 22.0% by weight. The invention will be further explained by way of examples. Show it

1 shows a table of a composition of the known from DE 103 57 096 A1 alusil alloy and Figure 2 is a micrograph of an inventive alloy of Example b) with scale.

Example 1 (Alusil 3+ alloy)

An aluminum-silicon casting alloy according to the invention for monolithic cylinder crankcases is formed of a hypereutectic aluminum-silicon alloy of the Alusil type AISiI 7Cu4Mg with phases of primary silicon and one or more further phases for improving the mechanical properties.

The starting alloy AISiI 7Cu4Mg has the following composition

The starting alloy AISi17Cu4Mg has a phase of primary silicon with grain sizes substantially from 15 to 80 μm and with a mean grain size of approximately 31 to 42 μm. It has the following mechanical properties after a heat treatment:

Tensile strength R m (at 20 ° C.): 230 to 300 MPa Elongation A 5 (at 20 ° C.): 0.2 to 0.8% compressive-tensile strength σ bw (at 200 ° C.) 60 to 80 MPa.

According to the invention, mixed crystals are formed by the following measures: a) Adding one or more elements of a list I which comprise at least the elements Titanium, vanadium, chromium, cobalt, nickel and zirconium, each in a content of up to 0.3 wt .-%. The mixed crystals formed with these elements are finely dispersed. In this case, the alloy content of the added elements is selected so that no precipitates form or the precipitates are so small that they are not recognized by light-optical microscopes. The alloying of the elements according to measure a) leads to the following mechanical properties:

Tensile strength, (T7 - heat treatment):> 260 MPa Elongation: <0.2% Tensile strength (at 150 0 C) 78 MPa

Example 2 (Alusil 2+ alloy)

An aluminum-silicon casting alloy according to the invention of example 2 corresponds to that of example 1 except for the following features:

The further phases are formed by the following measure instead of by measure a): b) adding one or more elements of a list II containing at least the elements titanium, vanadium, chromium, nickel and cobalt, each containing 0.3 to 2.5% by weight. In this case, the alloy content of the added elements and the casting process with subsequent annealing is selected such that the precipitates formed by the further phases have a substantially globular or block-like form and have a hardness of> 400 HV.

Example 3 (Super Alusil Alloy)

An aluminum-silicon casting alloy according to the invention corresponds to that of Example 1, with additional phases being additionally formed by measure b).

Example 4 (Alusil opt alloy)

An aluminum-silicon casting alloy according to the invention corresponds to that of Example 1 except for the following features:

The further phases are formed by the following measure: c) increase of the copper content to 7.0 to 10.0 wt .-%. In addition, the nickel content is increased up to 0.5% by weight and the silicon content up to 22.0% by weight.

Claims

P A T E N T A N S P R E C H E
An aluminum-silicon casting alloy for monolithic cylinder crankcases formed from a supereutectic aluminum-silicon alloy of the Alusil type AISiI 7Cu4Mg having phases of primary silicon and one or more further phases for improving wear resistance, the mixed crystals or phases formed by one or more of the following measures:
 a) adding one or more elements of a list I, which contains at least the elements titanium, vanadium, chromium, cobalt, nickel and zirconium, in a content of up to 0.3 wt .-% to a maximum of 1, 5 wt. % and mixed crystal formation, b) adding one or more elements of a list II, which contains at least the elements titanium, vanadium, chromium, nickel and cobalt, each containing 0.3 to 2.5 wt .-% to a maximum of 5 wt .-% and phase formation and c) increase the copper content to 7.0 to 10.0 wt .-%.
2. aluminum-silicon casting alloy according to claim 1, wherein according to measure a) one or more elements of the list I are added, characterized in that the elements with these a mixed crystal of the aluminum matrix is produced.
3. aluminum-silicon casting alloy according to claim 1 or 2, wherein according to measure b) one or more elements of the list Il are added, characterized in that the phases formed with these elements are formed as precipitates with a globular or block-like shape. 4. aluminum-silicon casting alloy according to one of claims 1 to 3, in which according to measure b) one or more elements of the list Il are added, characterized in that the phases formed with the elements of the list Il a hardness of> 400 HV exhibit.
5. aluminum-silicon casting alloy according to one of claims 1 to 4, wherein according to measure c) the copper content is increased to 7.0 to 10.0 wt .-%, characterized in that the nickel content up to 0.5 Wt .-% is increased.
6. aluminum-silicon casting alloy according to one of claims 1 to 5, characterized in that the silicon content is increased to up to 22.0 wt .-%.
 P A T E N T A N S P R E C H E
An aluminum-silicon casting alloy for monolithic cylinder crankcases formed from a supereutectic aluminum-silicon alloy of the Alusil type AISiI 7Cu4Mg having phases of primary silicon and one or more further phases for improving wear resistance, the mixed crystals or phases formed by one or more of the following measures:
 a) adding one or more elements of a list I, which contains at least the elements titanium, vanadium, chromium, cobalt, nickel and zirconium, in a content of up to 0.3 wt .-% to a maximum of 1, 5 wt. % and mixed crystal formation, b) adding one or more elements of a list II, which contains at least the elements titanium, vanadium, chromium, nickel and cobalt, each containing 0.3 to 2.5 wt .-% to a maximum of 5 wt .-% and phase formation and c) increase the copper content to 7.0 to 10.0 wt .-%.
2. aluminum-silicon casting alloy according to claim 1, wherein according to measure a) one or more elements of the list I are added, characterized in that the elements with these a mixed crystal of the aluminum matrix is produced.
3. aluminum-silicon casting alloy according to claim 1 or 2, wherein according to measure b) one or more elements of the list Il are added, characterized in that the phases formed with these elements are formed as precipitates with a globular or block-like shape. 4. aluminum-silicon casting alloy according to one of claims 1 to 3, in which according to measure b) one or more elements of the list Il are added, characterized in that the phases formed with the elements of the list Il a hardness of> 400 HV exhibit.
5. aluminum-silicon casting alloy according to one of claims 1 to 4, wherein according to measure c) the copper content is increased to 7.0 to 10.0 wt .-%, characterized in that the nickel content up to 0.5 Wt .-% is increased.
6. aluminum-silicon casting alloy according to one of claims 1 to 5, characterized in that the silicon content is increased to up to 22.0 wt .-%.
EP20080802663 2007-09-26 2008-09-26 Aluminum-silicon casting alloy for monolithic cylinder crankcases Withdrawn EP2193213A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102007046224 2007-09-26
PCT/EP2008/008214 WO2009043549A1 (en) 2007-09-26 2008-09-26 Aluminum-silicon casting alloy for monolithic cylinder crankcases

Publications (1)

Publication Number Publication Date
EP2193213A1 true EP2193213A1 (en) 2010-06-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080802663 Withdrawn EP2193213A1 (en) 2007-09-26 2008-09-26 Aluminum-silicon casting alloy for monolithic cylinder crankcases

Country Status (2)

Country Link
EP (1) EP2193213A1 (en)
WO (1) WO2009043549A1 (en)

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US3333579A (en) * 1964-06-29 1967-08-01 Reynolds Metals Co Formation of low friction glass-like surface on aluminum silicon alloy for engine operation
DE2345127C3 (en) * 1973-09-07 1979-08-30 Karl Schmidt Gmbh, 7107 Neckarsulm
US4055417A (en) * 1974-03-13 1977-10-25 Toyota Jidosha Kogyo Kabushiki Kaisha Hyper-eutectic aluminum-silicon based alloys for castings
JPS61291941A (en) * 1985-06-19 1986-12-22 Taiho Kogyo Co Ltd Cast al alloy having high si content
JPH08295973A (en) * 1995-04-26 1996-11-12 Nippon Light Metal Co Ltd Hyper-eutectic aluminum-silicon alloy, hypereutectic aluminum-silicon alloy casting and production of hypereutectic aluminum-silicon alloy casting
JPH1182151A (en) * 1997-09-11 1999-03-26 Yamaha Motor Co Ltd Cylinder block made of aluminium alloy
JP2001020047A (en) * 1999-07-05 2001-01-23 Tokyu Kk Stock for aluminum alloy forging and its production
US20010043880A1 (en) * 2000-03-20 2001-11-22 Jen-Dong Hwang Aluminum die casting alloy
EP1452716A1 (en) * 2003-03-01 2004-09-01 Bayerische Motorenwerke AG Monolitic Aluminium crackcase for highly stressed diesel engines
DE102005018200A1 (en) * 2005-04-19 2006-11-02 Honsel Gmbh & Co Kg Method for casting monoblock cylinder crankcases and die casting plant for carrying out the method
DE102006006849A1 (en) * 2006-02-15 2007-08-16 Bayerische Motoren Werke Ag Method for age hardening highly alloyed non-ferrous metals e.g. crankcase comprises carrying out inductive solution annealing with subsequent quenching

Non-Patent Citations (1)

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Title
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Also Published As

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