Abstract
Differential scanning calorimetry was used to obtain information about the latent heat and the temperature of phase transformations in hypoand hyper-eutectoid steels, cast irons and chromium alloy steels. The tests by DSC apparatus were conducted with a heating process to 1000°C at a constant rate of 5°C/min and with a cooling process to 300°C at same rate. In the heating process, the latent heat of the pearlite to austenite transformations increases rapidly to the carbon content up to eutectoid and decreases proportionally above. Each peak temperature of phase transformation shows an increase with the chromium contents. In the heating process, the latent heat of 5% and 10% chromium contents is approximately half the amount of 0%. The latent heat of phase transformation has a constant value for all chromium contents in the cooling process. The empirical expressions of the start temperature of phase transformation for chromium contents were confirmed for their effectiveness of SUJ2 (high carbon chromium bearing steel).
