Understanding of microstructures and mechanical properties of thermal sprayed Ni-based coatings with Al and Mo addition
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In this study, the mechanical properties of Ni coating implemented with twin wire arc spray (TWAS) were analyzed by adding Al and Mo to improve the surface properties of high-strength low-alloy steel. The effect of the additive element on the nickel coating was suggested through microstructure analysis such as grain size and intermetallic compounds, and the applicability of Mo in the Ni-Al coating was evaluated. In the Ni-5Al coating, when the Al content was increased to 20Al, the grain size decreased by 19.81%, and when Mo was added, it decreased by 8.91% in Ni-5.5Al-5Mo. In addition, the more Al was added, the more intermetallic com-pounds of NiAl and Ni3Al formed. This is because the increase in Al content and the addition of Mo caused FCC lattice structure expansion and provided the driving force for solid solution formation. As a result of the microhardness test, the mechanical properties of Ni-20Al and Ni-5.5Al-Mo increased by 121.68% and 16.58%, respectively, compared to Ni-5Al.
Abstract
In this study, the mechanical properties of Ni coating implemented with twin wire arc spray (TWAS) were analyzed by adding Al and Mo to improve the surface properties of high-strength low-alloy steel. The effect of the additive element on the nickel coating was suggested through microstructure analysis such as grain size and intermetallic compounds, and the applicability of Mo in the Ni-Al coating was evaluated. In the Ni-5Al coating, when the Al content was increased to 20Al, the grain size decreased by 19.81%, and when Mo was added, it decreased by 8.91% in Ni-5.5Al-5Mo. In addition, the more Al was added, the more intermetallic com-pounds of NiAl and Ni3Al formed. This is because the increase in Al content and the addition of Mo caused FCC lattice structure expansion and provided the driving force for solid solution formation. As a result of the microhardness test, the mechanical properties of Ni-20Al and Ni-5.5Al-Mo increased by 121.68% and 16.58%, respectively, compared to Ni-5Al.
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