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This study studied the phase transformations\udoccurring at different continuous cooling rates in an air\udhardening steel used in the rock-crushing industry. Samples\udof this steel were submitted for calorimetric testing using\udthe differential scanning calorimetry (DSC) technique. In\udthe experimental run, the samples were heated at the rate of\ud0.33 C/s from 50 to 1050 C and equilibrated at this\udtemperature for 900 s, then cooled at seven different\udcooling rates between 0.05 and 0.5 C/s. For all the cooling\udrates, the DSC traces of the samples showed a first exothermic\udpeak at about 500 C and for samples cooled at\udrates higher than 0.15 C/s, a second exothermic peak at\udabout 295 C was observed. From the microstructural\udinvestigations carried out by light microscopy (LM) and\udscanning electron microscopy (SEM), it was observed that\udall the samples after DSC treatment were characterized by\udthe presence of bainite. In the samples cooled at rates\udhigher than 0.15 C/s, martensite was also detected.\udComparing the results of DSC and SEM, it was concluded\udthat the first peak at 500 C corresponds to the austenite\ud- bainite transformation, while the second peak\udat 295 C corresponds to the austenite - martensite\udtransformation. The experimentally determined bainite and\udmartensite start temperatures were compared to the values\udderived from a number of well-known empirical equations

Microstructural Evolution of a Continuously Cooled Air Hardening Steel