In Situ Observation of Tensile Deformation Behavior in Eutectic TiC Particle‐Reinforced Ferrite–Steel Matrix Composite Prepared via Eutectic Solidification

A eutectic particle‐reinforced ferrite–steel matrix composite (SMC) is prepared through traditional smelting and casting methods. The evolution of eutectic TiC particles in the SMC during controlled rolling is studied, and the fracture mechanism of the SMC under tensile testing is investigated. Experimental results indicate that the eutectic particles in the ingot primarily exhibit irregular flake structures with a grain boundary‐like distribution. The dispersed redistribution and refinement of the eutectic particles, achieved through fracture and fragmentation, are facilitated by the rolling force, as well as the flow and the deformation of the matrix. High ductility (33 ± 1.5%) is achieved for the SMC due to the strong bonding interface between the eutectic particles and the ferrite matrix. In situ observations indicate that stress concentration tends to occur between the eutectic TiC particles and the matrix during the tensile process. The eutectic TiC particles begin to debond and fracture when the tensile curve reaches its peak. Eutectic particles do not act as effective crack sources during the initial stages of the tensile test, and the ductility of the SMC is primarily dependent on the matrix. The primary fracture mechanism involves voids generated by stress concentration connecting to form a macroscopic fracture.