A　laser　surface　cladding　technique　was　used　to　form　an　Ni-CI-B-Si-C　alloy　coating　doped　with　30　vol.-%SiCp　on　an　AISI　1045　steel　substrate.　The　SiC　particles　completely　dissolved　during　the　melting　stage　of　cladding.　The　bonding　zone　has　a　microstructure　of　a　gamma-Fe　band　resulting　from　epitaxial　planar　growth　followed　by　a　cellular　dendritic　eutectic　of　gamma-Ni　+　M-23　(C,　B)(6)　on　solidification,　characterised　by　directional　solidification.　The　microstructure　of　the　cladding　layer　is　composed　of　very　closely　spaced　net-like　M-23　(C,　B)(6)　primary　dendrites　and　a　small　amount　of　interdendritic　interdendritic　gamma-Ni　+　M-3(B,　Si)　lamellar　eutectic,　and　has　primary　small　spherical　graphite　particles　in　the　upper　part　of　the　cladding　layer.　The　rapid　solidification　involved　in　the　laser　cladding　resulted　in　substantial　extension　of　solid　solubility　of　Si　in　the　gamma-Ni　terminal　solid　solution.　The　M-23　(C,　B)(6)　primary　dendrites　contain　a　high　density　of　stacking　faults.　The　eutectic　M-3(B,　Si)　phase　exhibits　a　periodic　structure.　MST/3943.