We report a composite coating on vermicular graphite cast iron reinforced with Al2O3 particulates, processed by selective laser surface alloying, with the thickness of ∼600 µm and coverage fraction of 20%. The original microstructure was thus considerably modified. Different fractions of the Al2O3 particulates were added, ranging from 5 to 25 wt-%. Microhardness and strength were both increased, due to the formation of the composite coating, which led to a series of strengthening mechanisms. In addition, in thermal fatigue test, the crack density was reduced, due to the surface composite coating and the particular scanning strategy. Cracking on the sample surface was effectively restrained by the composite coating.
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