SST Technology Follow-On Program, Phase I. Titanium Alloy 6Al-4V Bar and Forgings.
Final rept. 1966-Mar 71 on Task 1,
BOEING CO SEATTLE WASH COMMERCIAL AIRPLANE GROUP
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A series of investigations were conducted to develop and characterize beta-processed Ti-6Al-4V bar and forgings. In addition to Ti-6Al-4V, the initial developmental studies included several other titanium alloys, Ti-8Al-1Mo-1V, Ti-6Al-6V-2Sn, and Ti-7Al-1Mo. Properties evaluated included strength, fracture toughness, stress-corrosion resistance K sub I scc fatigue, and metallurgical characteristics. The bar and forging material was found to be highly variable in properties. The variations in characteristics were associated with significant variations in chemical composition and microstructure. High fracture toughness properties were related to low oxygen contents and fully transformed beta microstructures. Properties of large forged block, 18 by 21 by 24 in., were comparable to those of conventional smaller blocks of highly forged material.
- Transport Aircraft
- Properties of Metals and Alloys
- Fabrication Metallurgy