Abstract
The effect of welding parameters on metallographic microstructure of aluminum bronze, interfacial microstructure and bonding strength of aluminum bronze and steel substrate has been studied. A cladding of aluminum bronze was obtained on the surface of medium carbon steel by CMT welding and short circuiting transfer welding. The microstructure of aluminum bronze and the interfacial microstructure of the interface between aluminum bronze and steel substrate have been systematically investigated. Sample 1-4 are α + (α + γ2) microstructure of typical aluminum bronze. As for Sample 5, iron-rich particles and dendrites were distributed on the α-Cu crystal matrix. The bonding strength of aluminum bronze and steel substrate has been collected according to the destructive testing method of the bimetallic bonding strength of sliding bearing. Among the five samples, Sample 4 and Sample 5 had the highest bonding strength (528.17MPa and 511.39Mpa, respectively).The reason for the enhancement of the bonding strength was discussed. In the interface of aluminum bronze and steel substrate, the transition layer will get thicker when the interdiffusion distance between Fe and Cu elements is larger, it would be more conducive to increase the bonding strength.
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