Microstructural Characterization of Ti-6Al-4V and its Relationship to Sample Geometry

摘要: 5 Acknowledgements Introduction Problem Application 6 Ti-6Al-4V Properties 7 Microstructures and Effects on 8 Forging 10 Temperature Strain Rate Types of Processes 12 Approaches 13 Experimental Procedure 15 Location Sample Cuts Preparation 17 Light Microscopy Error! Bookmark not defined.15 Results Discussion 19 Conclusions 21 References 22 Tables Table I. Different properties emphasizing mechanical II. Relationship between tensile strength section size solution treated aged titanium III. Quantitative data representing the average length lathes 18 Figures Figure 1. Problematic product with star indicating location most variance 2. Influence cooling rate phase composition 9 3. a) Common α-β microstructure exhibiting α-lamellae in a β-matrix, b) Diagram increased finer shorter α-lamellae, c) decreased longer thicker α-lamellae. ... 4. strain temperature its effects flow stress for 11 5. Depictionof typical induction heated isothermal forging process 6. Gas-fired infrared heating system hot-die 7. Alpha-beta showing equiaxed primary alpha transformed beta 14 8. Beta Widmanstatten morphology 9. Depiction sample areas labels 16 10. region cuts taken metallography designated by rectangles interested 11. Microstructure Section C (problematic area) at 200x martensitic B (closer to edge part) slightly different structure 12. Bar chart comparison lathe lengths Samples 13. Scatter plot sections standard deviation error bars included 20 Abstract A problem exists part produced made Shultz Steel throughout part. There is one specific that exhibits variance. The purpose report determine any microstructural differences within interest When microstructures inner outer were looked it was determined they exhibited structure. noticeable difference lath sections. contained larger more widely spread laths an 99.92 μm while consisted grains closely packed 75.89 μm. It then deduced likely cause these differences. Further testing will be conducted consisting testing, box micrographs, Electron Backscatter Diffractometry (EBSD).A (EBSD). Thank you providing material, machining, guidance. Special thanks Jim Davlantes his help. Also, thank project advisor Dr. Trevor Harding help