Montupet S.a.

Julien Morichon

Philippe Meyer

Denis Massinon

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: &#x2014;solution annealing (L) of the part for a time between three and ten hours; &#x2014;quenching (S) of the part in air or in a fluidized bed; &#x2014;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.

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Bussy-les-Daours, France

Julien Morichon