Titanium-based alloy and method of heat treatment of large-sized semifinished items of this alloy
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United States of America Patent
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Feb 19, 2008
Grant Date -
Sep 4, 2003
app pub date -
Feb 5, 2001
filing date -
Jul 19, 2000
priority date (Note) -
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Abstract
The inventive titanium alloy comprises, expressed in mass %: aluminium 4.0-6.3; vanadium 4.5-5.9; molybdenum 4.5-5.9; chromium 2.0-3.6; ferrum 0.2-0.5; the rest being titanium. An equivalent molybdenum content is determined as corresponding to Mo.sub.equiv.gtoreq.13.8. The inventive method for heat treatment consists in heating to t.sub..beta..revreaction..alpha.+.beta.-(30-70).degree. C., conditioning during 2-5 hrs, air or water cooling and age-hardening at a temperature ranging from 540.degree. C. to 600.degree. C. during 8-16 hrs. Said alloy has a high volumetric deformability and is used for manufacturing massive large-sized forged and pressed pieces having a high strength level, satisfactory characteristics of plasticity and fracture toughness.
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