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PROCESS FOR THE HEAT TREATMENT OF CYLINDER HEADS MADE OF AN ALUMINIUM-BASED ALLOY, AND CYLINDER HEADS HAVING IMPROVED FATIGUE RESISTANCE PROPERTIES
PROCESS FOR THE HEAT TREATMENT OF CYLINDER HEADS MADE OF AN ALUMINIUM-BASED ALLOY, AND CYLINDER HEADS HAVING IMPROVED FATIGUE RESISTANCE PROPERTIES
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机译:铝基合金制成的气缸盖的热处理工艺,以及提高了耐疲劳性的气缸盖
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摘要
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.
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