| 초록 |
In marine applications, large-scale engineering components is fabricated by nickel-aluminum bronze(NAB) alloy casting which has critical problems such as pollution, porosity, coarse microstructures and reduced mechanical properties in thick sections. Meanwhile, the wire-arc additive manufacturing(WAAM) come to the fore as one of the alternative manufacturing processes. Compare to the casting, it is more economical due to it saves machining loss and delivery time and also is possible to make complex components without pollution issues. In this study, two of commercial NAB wire had been additive manufactured on the CAC703 substrate to compare the additive manufacturability as a fundamental research. The precedent bead-on-plate(BOP) test were conducted with different process parameters of current, voltage and welding speed which are directly connected with heat-input. Subsequently, each wire was additive manufactured and analyzed. The samples were analyzed by the OM, SEM and EDS, as well as mechanical properties. |
