Q&P heat-treatments typically consist of an ¿Austenitisation - Interrupted Quench ¿ Partition ¿ Final Quench¿ heat treatment process. During the partitioning stage carbon escaping from the supersaturated martensite partitions into the austenite, stabilizing it and preventing transformation to martensite during the final quench to room temperature. Theoretically, this novel Q&P treatment should enable enrichment of the retained austenite phase to very high carbon levels, but experimentally, this has not yet been verified. Consequently, this project aims to study the solid-state transformations that occur during the various stages of the Q&P process and the extent of potential carbon enrichment of the retained austenite phase during partitioning, as ultimately this should have an important influence on the properties of the austenite phase and hence further development of the new steels.