Effect of laser power on microstructure and properties of iron-based alloy cladding layer
Five different laser powers(1000,1200,1400,1600 and 1800 W)were selected to prepare iron-based alloy cladding layers on the surface of Q235 carbon steel.Microstructure,mechanical properties and friction and wear resistance of the cladding layers were studied by means of optical microscope(OM),X-ray diffraction(XRD),scanning electron microscopy(SEM),electron backscatter diffraction(EBSD)technology,micro Vickers hardness tester and reciprocating friction and wear testing machine.The results show that the microstructure of the cladding layer is composed of martensite within dendrites,ferrite between dendrites and some retained austenite.As the laser power increases,the thickness and dilution rate of the cladding layer increase,and a large amount of secondary dendrite interfaces gradually dissolve,resulting in a continuous decrease in the amount of retained austenite.When the laser power is 1200 W,the average hardness of the cladding layer is the highest,reaching 606.4 HV0.5,which is 3.6 times of the substrate hardness,the wear volume and wear rate are the smallest,indicating good wear resistance.The wear mechanism of the cladding layer is abrasive wear and adhesive wear.
laser claddingFe-based alloy cladding layerhardnessfriction and wear
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