Correlation of Microstructures with Fracture Toughness Properties in Metals
Final rept. 1 Jun 1972-30 Sep 1973
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
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Ti-6Al-4V alloy was studied in three mill product forms for the purpose of establishing a correlation between microstructure and fracture toughness. Tension test, fracture toughness, and crack growth rate properties were determined. Light microscopy, scanning electron microfractography, and transmission electron microscopy were the metallographic means employed. A key factor in the microstructural and fracture toughness differences is cooling rate. The fatigue crack propagation rate was found to vary widely among the different microstructures. There was some correlation between microfractographic modes and fracture toughness.
- Properties of Metals and Alloys