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AssigneeVsmpo
InventorsVladislav Valentinovich Tetyukhin, Jury Ivanovich Zakharov, Igor Vasilievich Levin
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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 Moequiv.≧13.8. The total aluminum and zirconium content does not exceed 7.2. The inventive method for heat treatment consists in heating to tβ<>α+β−(30-70)° C., conditioning during 2-5 hrs. at that temperature, air or water cooling and age-hardening at a temperature ranging from 540° C. to 600° 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.
Titanium-based alloy containing aluminum, vanadium, molybdenum, chromium, iron, zirconium, oxygen and titanium which distinction is that it additionally contains nitrogen with the following proportion of components, % by mass:
Method of heat treatment of large-sized semifinished items of titanium-based alloys comprising heating, holding at the temperature lower than the polymorphic transformation temperature, cooling and aging which distinction is that heating is performed directly to tβ⇄α+β−(30-70)° C., holding at the said temperature is performed for 2-5 hours, and aging is performed at 540-600° C. for 8-16 hours.
Dependencies are inferred from the claim text.