Improved Properties of Ti-6A1-6V-2Sn through Micro-structure Modification.
Technical rept. Jan-Aug 70,
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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The fracture toughness of the Ti-6Al-6V-2Sn alloy in the annealed condition is greatly influenced by microstructural features which may vary considerably as a result of differing thermal-mechanical processing operations employed prior to the annealing heat treatment. The variety of microstructures which can result merely by heat treatment is categorized and the related tensile and toughness properties are presented. In instances where higher fracture toughness is desired, judicious heat treatment of the as-received material can often increase this property. Of the heat treatments employed in this investigation, the properties were most significantly improved by solution treating at 1710F for 80 minutes, air cooling, and subsequently heating to 1400F for one hour followed by an air cool. The tensile strength of the alloy was increased from 150 to 155.6 ksi and the fracture toughness K sub Q was raised from 55.8 to 68.0 ksi sq in. Author
- Properties of Metals and Alloys