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采用过流冷却法制备高铬铸铁半固态浆料,对初生相细化球化机理进行研究。结果表明,在冷却体作用下,熔体中大量快速形核长大的初生相通过物理、冶金作用分解和熟化成细小的等轴状颗粒而达到细化球化。树枝状初生奥氏体通过枝晶臂熔断和主干弯曲折断而细化球化,早期以枝晶臂熔断为主,后期以主干在剪切力作用下弯曲折断为主;高硬度的M7C3型初生碳化物通过横向折断和纵向分裂而达到细化球化,早期以横向折断为主,后期以纵向分裂为主。
High-chrome cast iron semi-solid slurry was prepared by over-current cooling method, and the microstructure of the primary phase was studied. The results show that under the action of the cooling body, a large number of rapidly nucleated and grown primary phases in the melt decompose and mature into fine equiaxed particles through the physical and metallurgical actions to achieve refined spheroidization. Dendritic primary austenite through the dendritic arm fusions and the main bending fracture and refinement of the ball, the early dendrite arm blown mainly in the late to the main role of shear bending under bending; high hardness M7C3 type of primary Carbide through the lateral fracture and longitudinal division to achieve the refining of the ball, the early break to the main horizontal, the late longitudinal split mainly.