Abstract
The Vickers indentation technique has been used to freeze-in the amplitude of the thermal stresses appearing during quenching and to evaluate the effective coefficient of heat transfer. The later varies from 4000 W/m2K to 16000 W/m2K in the case of water at RT (100 °C < ΔT < 210 °C), and from 400 W/m2K to 800 W/m2K in the case of a low viscosity silicon oil (200 °C < AT < 550 °C). La technique de l'indentation Vickers a été utilisée pour geler l'état des contraintes thermiques et évaluer le coefficient de transfert thermique pendant la trempe. Ce dernier varie de 4000 W/m2K à 16000 W/m2K dans le cas de l'eau à température ambiante (100 °C < ΔT < 210 °C) et de 400 W/m2K à 800 W/m2K pour celui d'une huile silicone de faible viscosité (200 °C < AT < 550 °C).
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