Abstract
In the present study, the combination of ultrasonic burnishing and heat treatment were applied on a laser cladded Fe-based coating. Besides ultrasonic burnishing at room temperature (UB), two combination strategies of ultrasonic burnishing and heat treatment were explored, i.e. ultrasonic burnishing at a medium temperature (ultrasonic warm burnishing, UWB), and UWB coupled with continuous heat treatment for a period of time (ultrasonic warm burnishing coupled with heat treatment, UWB/HT). Total four samples were prepared and experimentally investigated. Comparing with untreated (control) sample, the surface properties of the three differently treated samples were improved to varying degrees, where the sample subjected to UWB/HT process acquired the best one. UWB/HT Process declined the roughness and porosity of Fe-based coating by 87.86%, 65.41%, and the hardness increased by 34.88% compared to that of control sample, respectively. The residual stress and microstructure of UWB/HT sample also acquired a largest improvement. In addition, the UWB/HT Fe-based coating exhibited the best wear resistance. Summarily, UWB/HT is considered to have the greatest potential to achieve the effective treatment of laser cladding with excellent surface properties over the other two strategies, which is expected to further advance the application of laser cladding technique particularly in the fabrication of some high-demand products serving in harsh conditions.
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