Abstract
By modifying the Si content, a [(Fe0.6Co0.2Ni0.2)0.69B0.2Si0.11]96Nb4 amorphous/crystalline composite coating with high thermal stability and good tribological performance is fabricated by laser cladding on the Q235A steel. The coating has a Vickers hardness of 930 Hv, a high fracture strength above 2800 MPa, as well as a low wear loss of 3.77 × 105 μm3 under a load of 10 N and a reciprocating frequency of 5 Hz after 30 min. The coating has a composition close to eutectic point, which leads to its large glass-forming ability and high amorphous fraction. The proper addition of Si also suppresses the formation and growth of dendritic grains. The good tribological performance of the coating comes from the high amorphous content and the refined crystalline structures.
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