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Investigations on the microstructures and properties of in‐situ synthesized (TiB2+Fe2B)/steel‐based composites

By adding titanium and boron elements in the molten steel whose compositions were 0.10–0.30 %C, 0.20–0.50 %Si, 0.60–1.20 %Mn and 0.50–1.50 %Cu, particulate‐reinforced metal matrix composites (MMCs) were obtained. The reinforced phase and matrix were studied by means of the optical microscopy (OM), the scanning electron microscopy (SEM) and the X‐ray diffraction (XRD). Moreover, the mechanical properties and abrasion resistance of steel‐based MMCs were measured. The results show that the in‐situ reinforced particulates of steel‐based MMCs are TiB2 and Fe2B. After heat treatment, the in‐situ reinforced particulates change into the nodular and granular forms from the broken networks. The mechanical properties and abrasion resistance of steel‐based MMCs are improved obviously. At last, the reason that in‐situ reinforced particulates improve the properties of steel‐based MMCs is particularly analyzed.