Casting made from aluminium alloy, having high hot creep and fatigue resistance

Patent metadata

Field	Value
Publication number	US-9982328-B2
Application number	US-200913055394-A
Country	US
Kind code	B2
Filing date	Jul 1, 2009
Priority date	Jul 30, 2008
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

The subject of the invention is a cast part with high static mechanical strength, and for fatigue and hot creep, made of aluminum alloy of composition:
Si: 3-11%, preferably 5.0-9.0% Fe<0.50%, preferably <0.30%, preferably still <0.19% or even 0.12% Cu: 2.0-5.0%, preferably 2.5-4.2%, preferably still 3.0-4.0% Mn: 0.05-0.50%, preferably 0.08-0.20% Mg: 0.10-0.25%, preferably 0.10-0.20% Zn: <0.30%, preferably <0.10% Ni: <0.30%, preferably <0.10% V: 0.05-0.19%, preferably 0.08-0.19%, preferably still 0.10-0.19% Zr: 0.05-0.25%, preferably 0.08-0.20% Ti: 0.01-0.25%, preferably 0.05-0.20% other elements <0.05% each and 0.15% in total, the rest aluminum.

It more particularly relates to cylinder heads for supercharged diesel or petrol internal combustion engines.

First claim

The invention claimed is:

1. Cast part made of aluminum alloy of chemical composition, expressed in percentages by weight, consisting essentially of:
Si: at least 3% and less than 9%
Fe<0.50%
Cu: 2.0-5.0%
Mn: 0.05-0.50%
Mg: 0.10-0.19%
Zn: <0.30%
Ni: <0.10%
V: 0.05-0.19%
Zr: 0.05-0.25%
Ti: 0.01-0.25%
optionally one or more elements to modify eutectics chosen from Sr (30-500 ppm), Na (20-100 ppm) and Ca (30-120 ppm), or Sb (0.05-0.25%) to refine eutectics, and
other elements <0.05% each and 0.15% in total, the rest aluminum,
wherein the cast part is an automotive engine component, and
wherein the cast part has a microstructure that includes one or both of an Al 5 FeSi phase and an Al 5 (Fe,Mn)Si 2 phase.

2. Cast part according to claim 1 , characterized in that the silicon content of the alloy is at least 5.0% and less than 9.0%.

3. Cast part according to claim 1 characterized in that the vanadium content lies between 0.08 and 0.19%.

4. Cast part according to claim 1 , characterized in that the iron content is lower than 0.30%.

5. Cast part according to claim 1 characterized in that the copper content lies between 2.5 and 4.2%.

6. Cast part according to claim 1 characterized in that the manganese content lies between 0.08 and 0.20%.

7. Cast part according to claim 1 , characterized in that the zinc content is lower than 0.10%.

8. Cast part according to claim 1 characterized in that the zirconium content lies between 0.08 and 0.20%.

9. Cast part according to claim 1 characterized in that the titanium content lies between 0.05 and 0.20%.

10. Cast part according to claim 1 , characterized in that the iron content is lower than 0.19%.

11. Cast part according to claim 1 , characterized in that the iron content is lower than 0.12%.

12. Cast part according to claim 1 characterized in that the copper content lies between 3.0 and 4.0%.

13. Cast part according to claim 1 characterized in that the vanadium content lies between 0.10 and 0.19%.

14. Cast part according to claim 1 characterized in that the cast part undergoes heat treatment of type T7 or T6.

15. Cast part according to claim 1 , characterized in that the cast part undergoes heat treatment of type T7 or T6 comprising solution heat-treatment at a temperature ranging between 500 and 513° C. for at least 30 minutes.

16. Cast part according to claim 1 , characterized in that the cast part is a cylinder head of an internal combustion engine.

17. Cast part according to claim 1 , characterized in that the cast part is an insert for a hot part of a cast part.

18. Cast part made of aluminum alloy of chemical composition, expressed in percentages by weight, consisting essentially of:
Si: at least 3% and less than 9%
Fe<0.50%
Cu: 2.0-5.0%
Mn: 0.05-0.50%
Mg: 0.10-0.19%
Zn: <0.30%
Ni: <0.10%
V: 0.05-0.17%
Zr: 0.05-0.25%
Ti: 0.01-0.25%
optionally one or more elements to modify eutectics chosen from Sr (30-500 ppm), Na (20-100 ppm) and Ca (30-120 ppm), or Sb (0.05-0.25%) to refine eutectics, and
other elements <0.05% each and 0.15% in total, the rest aluminum,
wherein the cast part is an automotive engine component, and
wherein the cast part has a microstructure that includes one or both of an Al 5 FeSi phase and an Al 5 (Fe,Mn)Si 2 phase.

19. Cast part according to claim 18 characterized in that the vanadium content lies between 0.08 and 0.17%.

20. Cast part according to claim 1 , characterized in that the alloy has a yield strength of at least 285 MPa at 20° C., at least 86 MPa at 250° C., and at least 50 MPa at 300° C.

21. Cast part according to claim 1 , characterized in that the alloy has a yield strength of at least 285 MPa at 20° C.

22. Cast part according to claim 1 , characterized in that the alloy has a yield strength of at least 285 MPa at 20° C., and at least 86 MPa at 250° C.

23. Cast part according to claim 1 , characterized in that the alloy has a yield strength of at least 285 MPa at 20° C., and at least 50 MPa at 300° C.

24. Cast part made of aluminum alloy of chemical composition, expressed in percentages by weight, consisting essentially of:
Si: at least 3% and less than 9%
Fe<0.50%
Cu: 2.0-5.0%
Mn: 0.05-0.50%
Mg: 0.10-0.25%
Zn: <0.30%
Ni: <0.10%
V: 0.05-0.19%
Zr: 0.05-0.25%
Ti: 0.01-0.25%
optionally one or more elements to modify eutectics chosen from Sr (30-500 ppm), Na (20-100 ppm) and Ca (30-120 ppm), or Sb (0.05-0.25%) to refine eutectics, and
other elements <0.05% each and 0.15% in total, the rest aluminum,
wherein the cast part is an automotive engine component,
wherein the cast part has a microstructure that includes one or both of an Al 5 FeSi phase and an Al 5 (Fe,Mn)Si 2 phase, and
wherein the alloy has a yield strength of at least 285 MPa at 20° C., at least 86 MPa at 250° C., and at least 50 MPa at 300° C.

25. Cast part made of aluminum alloy of chemical composition, expressed in percentages by weight, consisting essentially of:
Si: at least 3% and less than 9%
Fe<0.50%
Cu: 2.0-5.0%
Mn: 0.05-0.50%
Mg: 0.10-0.25%
Zn: <0.30%
Ni: <0.10%
V: 0.05-0.19%
Zr: 0.05-0.25%
Ti: 0.01-0.25%
optionally one or more elements to modify eutectics chosen from Sr (30-500 ppm), Na (20-100 ppm) and Ca (30-120 ppm), or Sb (0.05-0.25%) to refine eutectics, and
other elements <0.05% each and 0.15% in total, the rest aluminum,
wherein the cast part is an automotive engine component,
wherein the cast part has a microstructure that includes one or both of an Al 5 FeSi phase and an Al 5 (Fe,Mn)Si 2 phase, and
wherein the alloy has a yield strength of at least 285 MPa at 20° C.

26. Cast part made of aluminum alloy of chemical composition, expressed in percentages by weight, consisting essentially of:
Si: at least 3% and less than 9%
Fe<0.50%
Cu: 2.0-5.0%
Mn: 0.05-0.50%
Mg: 0.10-0.25%
Zn: <0.30%
Ni: <0.10%
V: 0.05-0.19%
Zr: 0.05-0.25%
Ti: 0.01-0.25%
optionally one or more elements to modify eutectics chosen from Sr (30-500 ppm), Na (20-100 ppm) and Ca (30-120 ppm), or Sb (0.05-0.25%) to refine eutectics, and
other elements <0.05% each and 0.15% in total, the rest aluminum,
wherein the cast part is an automotive engine component,
wherein the cast part has a microstructure that includes one or both of an Al 5 FeSi phase and an Al 5 (Fe,Mn)Si 2 phase, and
wherein the alloy has a yield strength of at least 285 MPa at 20° C., and at least 86 MPa at 250° C.

27. Cast part made of aluminum alloy of chemical composition, expressed in percentages by weight, consisting essentially of:
Si: at least 3% and less than 9%
Fe<0.50%
Cu: 2.0-5.0%
Mn: 0.05-0.50%
Mg: 0.10-0.25%
Zn: <0.30%
Ni: <0.10%
V: 0.05-0.19%
Zr: 0.05-0.25%
Ti: 0.01-0.25%
optionally one or more elements to modify eutectics chosen from Sr (30-500 ppm), Na (20-100 ppm) and Ca (30-120 ppm), or Sb (0.05-0.25%) to refine eutectics, and
other elements <0.05% each and 0.15% in total, the rest aluminum,
wherein the cast part is an automotive engine component,
wherein the cast part has a microstructure that includes one or both of an Al 5 FeSi phase and an Al 5 (Fe,Mn)Si 2 phase, and
wherein the alloy has a yield strength of at least 285 MPa at 20° C., and at least 50 MPa at 300° C.

Assignees

• Garat Michel
• Rio Tinto Alcan Int Ltd

Inventors

• Garat Michel

Classifications

• C22C21/04

  Modified aluminium-silicon alloys · CPC title

• C22F1/057

  of alloys with copper as the next major constituent · CPC title

• C22C21/02 Primary

  with silicon as the next major constituent · CPC title

• F02F1/24

  Cylinder heads · CPC title

• C22F1/043

  of alloys with silicon as the next major constituent · CPC title