Abstract:The 45 steel was processed by laser remelting after the carbonitriding heat treatment in this study. The microstructure morphology and microhardness of the laser-remelting layer at different laser powers were investigated by scanning electron microscope (SEM) and microhardness tester, respectively. The results show that a compact microstructure and a homogeneous element distribution can be achieved at the laser power of 1.2 kW under the given other laser parameters, and the microhardness was enhanced greatly.
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