Effect of laser cladding process parameters on porosity and properties of AlSi10Mg coating
In this study,AlSi10Mg coating was prepared on the surface of ZL205A aluminum alloy by laser cladding technology.The effects of powder feeding rate and scanning speed on the porosity defects of the cladding layer were studied.The microstructure of the coating was observed by optical microscope.The properties of the cladding layer were tested by microhardness tester and friction and wear tester.The results showed that the pores in the coating are distributed along the direction of Marangoni convection,and the pores of the coating could be controlled by low powder feeding rate and fast scanning speed.The bottom of the coating was columnar crystal,the middle was the transition zone from columnar crystal to cellular crystal,and the top area was mainly cellular crystal.The wear resistance of the coating with the highest microhardness was also significantly improved.
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