Abstract
In this work, the feasibility test of friction stir processing (FSP) of 1.5-mm-thick austenitic stainless steel cold spray coating deposited on 304L stainless steel substrate was performed using tungsten carbide tool. Applied FSP parameters (advance speed 50 mm/min, rotation speed 300 rpm, axial force 20 kN, tilt angle 1.5°) allowed to perform FSP treatment with a higher depth than the coating thickness. As a result, the material mixing at the coating-substrate interface was observed. The microstructure observation revealed that the coating microstructure in the stir zone was significantly modified. EBSD analysis confirmed that full material recrystallization during FSP allowed the formation of dense and uniform fine-grained structure with the mean grain size of 1.9 mm. Average coating microhardness was decreased from 406 to 299 HV. Further FSP parameter optimization should be carried out in order to improve the process reliability and avoid any coating failure during treatment.
Highlights
Austenitic stainless steels are widely used for different industrial applications thanks to their excellent corrosion resistance in various aggressive environments and high mechanical properties at elevated temperatures
In this work the feasibility test of friction stir processing (FSP) of 1.5 mm thick austenitic stainless steel cold spray coating deposited on 304L stainless steel substrate was performed using tungsten carbide tool
The porosity value was not measured in this study, high porosity of stainless steel cold spray deposits sprayed using nitrogen was previously reported by Villa et al [11], Sova et al [18] and Adachi et al [47]
Summary
Austenitic stainless steels are widely used for different industrial applications thanks to their excellent corrosion resistance in various aggressive environments and high mechanical properties at elevated temperatures. Damaged stainless steel components could be replaced or repaired, depending on the nature of failure, the component dimensions and complexity. Different material deposition techniques involving high temperature processes like welding, laser cladding etc. Are widely used for stainless steel component repair [1,2,3]. In some cases the application of these methods is difficult due to significant thermal impact. In case of repair of complex parts with the microstructure, the extensive heating of the deposition site induces high thermal stresses that could distort the repaired part
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