Effects of inclined angle on semi-solid microstructure of hypoeutectic high Cr cast iron prepared by inclined plate cooling method were investigated. The results show that the bigger or smaller inclined angle can cause the occurrence of coarse primary austenite crystal with low spheroidalization. Coarse primary austenite phase in dendrite is attributed to slower flow velocity of the liquid metal resulting in the full growth of primary phase companying with low scouring

impacting and shearing between dendrite and dendrite or dendrite and liquid metal with low inclined angle

while with high inclined angle

coarse dendrite austenite occurs due to faster flow velocity resulting in shortening flow time on inclined plate and shortening acting time of scouring

impacting and shearing in dendrites and between dendrite and liquid metal. Primary austenite phase in prepared hypoeutectic high Cr cast iron possesses the finest grain size and best speroidalization with inclined angle of 45°.