Abstract
In this work, the influence of temperature and heating rate on mechanical properties of three carbon steels (containing respectively 0.1%, 0.38% and 1% of carbon) has been investigated. Using a specifically designed apparatus equipped with a heating device, tensile and relaxation tests have been performed in air under three conditions of temperature (600 °C, 800 °C and 1100 °C) and for two extreme values of heating rate (10 °C/s and 270 °C/s respectively). A significant dependence of mechanical properties ( such as the yield stress and the maximal stress) upon the rate of heating has been pointed out. For instance, at 600 °C, for each material, an essential decrease of the yield stress as well as the flow stress was observed for the heating rate of 270 °C/s. Moreover, for a given temperature value, our results show that this parameter also affects the strain hardening factor as well as the strain rate sensitivity exponent.
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