Highly Wear-resistant and Crack-free Double-layer Fe-based Amorphous Composite Coatings by Laser Cladding
The crack-free Fe-based amorphous composite coatings were prepared by single-layer and double-layer laser cladding with different scanning rates on the surface of 40Cr steel using SAM2X5 amorphous alloy powder.Effects of double-layer cladding process on microstructure,element distribution,hardness and wear resistance of Fe-based amorphous composite coatings were analyzed.The results indicate that the double-layer cladding of Fe-based amorphous alloy composite coating can enhance the hardness and wear resistance of the coating.In addition,as the laser scanning rate of the second layer increases,the composition dilution of the coating by the substrate is decreased,and the hardness as well as wear resistance of the coating are increased.The hardness of coating reaches the highest at the second laser scanning rate of 1 m/min,with an average hardness of 852 HV0.1,which is about three times of the substrate.The wear resistance of the coating is much higher than that of the substrate,reaching the optimal at the sec-ond scanning rate of 1 m/min,where the wear volume is 28%of that of the substrate.
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