Titanium alloy and method for heat treatment of large-sized semifinished materials of said alloy
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United States of America Patent
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Oct 5, 2004
Grant Date -
Jun 26, 2003
app pub date -
Nov 1, 2002
filing date -
Jul 19, 2000
priority date (Note) -
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Abstract
The inventive titanium alloy comprises, expressed in mass %: aluminium 4.0-6.0; vanadium 4.5-5.0; molybdenum 4.5-5.0; 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 total aluminum and zirconium content does not exceed 7.2. The inventive method for heat treatment consists in heating to t.sub..beta.<>.alpha.+.beta. -(30-70).degree. C., conditioning during 2-5 hrs. at that temperature, 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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