Abstract:Semi-solid slurries of high-chromium iron were prepared with slope plate overflowing cooling method, and the morphology evolution of different primary phase in those slurries at different groove radius of slope plate cooling body was studied. The results show that the slope plate cooling method is an effective method to refine the microstructure of semi-solid slurry of high-chromium iron. The refinement of primary austenite by dendritic growth in a relatively smaller groove radius of cooling body is mainly in the form of fusing, and the structure of that in relatively larger groove radius of cooling body is mainly kinking. The refining of primary M7C3 carbides by rhabditiform growth is mainly in forms of cracking, breaking and splitting. For primary M7C3 carbides, it is relatively easy to form thicker swathing layer long rod primary carbides in smaller groove radius of cooling body than in bigger groove radius, and these carbides are difficult to be crushed and broken.