摘要: The high-temperature dissolution behavior of primary carbides in samples taken from GCr15 continuous-casting bloom was observed in-situ by confocal laser scanning microscopy. Equations were fitted to the dissolution kinetics of primary carbides during either heating or soaking. Dissolution of carbides proceeded in three stages (fast → slow → faster) as either temperature or holding time was increased. During the heating process and during the first and third stages of the soaking process, the original size of the carbides determined the steepness of the slope, but during the middle (“slow”) stage of the soaking process, the slope remained zero. The initial size of the carbides varied greatly, but their final dissolution temperature fell within the narrow range of 1210-1235 °C, and the holding time remained within 50 min. Fractal analysis was used to study the morphological characteristics of small and medium-sized carbides during the dissolution process. According to changes in the fractal dimension before and after soaking, the carbides tended to evolve towards a more regular morphology.