Titanium alloy and method for heat treatment of large-sized semifinished materials of said alloy

   
   

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.

A liga titanium inventive compreende, expressado em % maciços: alumínio 4.0-6.0; vanadium 4.5-5.0; molibdênio 4.5-5.0; cromo 2.0-3.6; ferrum 0.2-0.5; o descanso que é titanium. Um índice equivalente do molibdênio é determinado como correspondendo a Mo.sub.equiv..gtoreq.13.8. O índice total do alumínio e do zirconium não excede 7.2. O método inventive para o tratamento de calor consiste em aquecer-se a t.sub..beta. alpha.+.beta. -(30-70).degree. C., condicionando durante 2-5 horas. nnesse temperatura, refrigerar do ar ou de água e idade-endurecer-se em uma temperatura que varia de 540.degree. C. a 600.degree. C. durante 8-16 horas. A liga dita tem um deformability volumetric elevado e é usada para as partes forjadas do manufacturing e pressionadas large-sized maciças que têm um nível elevado da força, umas características satisfatórias do plasticity e um toughness da fratura.

 
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