To promote the applications of laser cladding to thicker and large area coating conditions, a novel laser deep penetration spot cladding method was developed to integrate the characteristics of laser texturing, laser deep penetration welding, laser cladding and laser alloying. Experiments indicate that this method is able to achieve a deeper hardened layer containing a cladding zone and alloying zone with particulate reinforced metal matrix composite, which is free of crack and porosity. The microstructure in both the cladding and alloying zone is composed of in situ precipitated TiC carbide hard particles homogeneous distributed in tough FeCSiB austenite matrix. The hardened layer contains 0.8mm cladding zone and 0.7mm alloying zone,. The microhardness is 661-909 HV0.2 in cladding zone and 570-732 HV0.2 alloying zone.

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