| Abstract Scope |
Laser-powder Directed Energy Deposition (LP-DED) processes are widely used to develop new composite materials, repair damaged mechanical parts, and deposit dissimilar materials. The thermal characteristics of deposited parts directly affect their microstructural and mechanical properties. The purpose of this study is to develop a thermal characteristics monitoring system for the LP-DED process. An IR camera-based off-axis in-situ monitoring system was designed for the LP-DED process. Basic geometric deposition experiments, including single-line and hexahedral shapes, were performed to obtain thermal history data during the deposition process. Thermal characteristics, including maximum temperature, cooling rate, and accumulated heat, are discussed based on the thermal history data. In addition, the relationship between thermal characteristics and microstructural/mechanical properties is also discussed. From these results, the feasibility of the proposed thermal characteristics monitoring system for LP-DED is evaluated. |