Mechanical Properties AO TONG In Summary: when properly processed,the static mechanical properties of AM metallic materials are comparable to conventionally fabricated metallic components.The relatively high cooling rates achieved reduce partitioning and favor reduced grain sizes. However,AM fabricated materials do exhibit microstructural and mechanical property anisotropy with the Z-direction generally being the weakest. Dynamic properties of AM produced alloys are dominated by defect structures,viz.,micro-porosity and surface finish. However,properly processed and finished machined AM alloys can exhibit fatigue properties on parity with those of wrought alloys. MT333 Materials Applications Practice Prof.XiaoQi Chen B.21 4.Project Case Manufacturing and repair of turbine compressor airfoils Initial Parameters CO,Laser beam (Laser power.velocity.powder feed rate.overlap ratio etc.) Focus Lens Transfer Functions Powder feed in Central Nozzle Basic Deposition Feature Sizes (Single Bead width,height) Laser Scanning Direction Toolpath Design with Fixed Bead Width and Overlap Ratio Powder Nozzle Deposited (solidmed) Melt Pool created by laser Powder being clad to s Material Overlap Ratio Calculation 77777777777777777777 Substrate (for interior stitching toolpath) Fig.2 Schematic of the laser powder deposition process b Transfer Functions Add Power variations to Toolpath G-Code Final G-Code Fig.IaInteerally bladedotor disk-blisk:btypical cross-sctionl Adaptive toolpath design flowchart geometries of a blisk airfoil Prof.XiaoQi ChenMT333 Materials Applications B.21 & Practice Prof. XiaoQi Chen In Summary:  when properly processed, the static mechanical properties of AM metallic materials are comparable to conventionally fabricated metallic components. The relatively high cooling rates achieved reduce partitioning and favor reduced grain sizes.  However, AM fabricated materials do exhibit microstructural and mechanical property anisotropy with the Z-direction generally being the weakest.  Dynamic properties of AM produced alloys are dominated by defect structures, viz., micro-porosity and surface finish. However, properly processed and finished machined AM alloys can exhibit fatigue properties on parity with those of wrought alloys. Mechanical Properties MT333 Materials Applications B.22 & Practice Prof. XiaoQi Chen 4. Project Case Manufacturing and repair of turbine compressor airfoils