Process for the heat treatment of cylinder heads made of an aluminium-based alloy, and cylinder heads having improved fatigue resistance properties
US9303303B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2008 |
| Grant date | Apr 5, 2016 |
| Priority date | — |
| Expiry date | Jun 19, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/043
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates, according to a first aspect, to a process for the heat treatment of a cylinder head-type casting made from an aluminum alloy, in particular an alloy of aluminum, of silicon and of magnesium, and where appropriate of copper, comprising the steps of: —solution annealing (L) of the part for a time between three and ten hours; —quenching (S) of the part in air or in a fluidized bed; —tempering (H) of the part at the peak of resistance, or in the vicinity of the peak of resistance to attain a level of resistance of the part at least equal to 85% of the maximum level of resistance at the tempering temperature in question. According to a second aspect, the invention relates to the castings obtained at the end of the process according to the invention, and which have an improved fatigue resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.