Effect of Powder Flow on Properties of High-speed Laser Cladding Iron-based Cladded Layer on Aluminum Alloy Surface
In order to improve the friction and wear resistance of the aluminum alloy surface,the high-speed laser cladding process was used to prepare the martensitic stainless steel wear-resistant cladded layer on the surface of ADC 12 die-casting aluminum alloy.The effects of different powder flow rates on the surface roughness,thickness and hardness of the cladded layer were studied.The micro-morphology of the interface area between the cladded layer and the matrix was analyzed.The friction and wear properties of martensitic cladded layer,ADC12 aluminum alloy and cast iron HT250 were compared.The results show that the powder flow has a significant effect on the thickness and surface quality of the cladded layer.The junction between the cladded layer and the substrate is not completely smooth,and there are convoluted irregular structures and microscopic pores.Under the friction and wear test conditions described in the paper,the volume loss of martensitic stainless steel cladded layer is only 23.1％of that of aluminum alloy and 60.0％of that of cast iron HT250.It shows that the wear resistance of the martensitic stainless steel cladded layer is obviously better than that of the base ADC 12 aluminum alloy under the condition,and it is better than the comparison cylinder liner material cast iron HT250,which has better friction and wear resistance.
high-speed laser claddingdissimilar metal connectionsurface modificationfriction and wear
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