Metastable beta-titanium alloy

Abstract

Metastable β-titanium alloy contains, in mass %: from 1.5 to 3.5 aluminum; from 4.5 to 8.0 molybdenum; from 1.0 to 3.5 vanadium; from 1.5 to 3.8 iron; titanium balance. This alloy combines high strength and ductility. This allows to use it for production of a wide range of critical parts including fastener components and different coil springs (e.g. in automobile industry).

1 : Process for preparation of a metastable β-titanium alloy containing aluminum, molybdenum, and iron, and vanadium, consisting essentially of (mass %): 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   Aluminum 
                   1.5-3.5 
                 
                     
                   Molybdenum 
                   4.5-8.0 
                 
                     
                   Vanadium 
                   1.0-3.5 
                 
                     
                   Iron 
                   1.6-3.8 
                 
                     
                   Titanium 
                   balance, 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
               
            
           
         
       
       wherein the molybdenum is added as ferromolybdenum with 55-75% of molybdenum and a balance of iron. 
     
     
         2 : The process of  claim 1  wherein the vanadium is added as ferrovanadium with 65-80% of vanadium and a balance of iron. 
     
     
         3 : The process of  claim 1  wherein the vanadium is added as a Ti—Al—V system scrap. 
     
     
         4 : A process for preparation of a metastable β-titanium-base alloy consisting of (mass %): 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   Aluminum 
                   1.5-3.5 
                 
                     
                   Molybdenum 
                   4.5-8.0 
                 
                     
                   Vanadium 
                   1.0-3.5 
                 
                     
                   Iron 
                   1.5-3.8 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
               
            
           
         
         Incidental impurities; and 
         Titanium balance, 
       
       wherein the molybdenum is added as ferromolybdenum with 55-75% of molybdenum and a balance of iron. 
     
     
         5 : The process of  claim 4  wherein the vanadium is added as ferrovanadium with 65-80% of vanadium and a balance of iron. 
     
     
         6 : The process of  claim 4  wherein the vanadium is added as a Ti—Al—V system scrap. 
       Metastable β-titanium alloy containing aluminum, molybdenum and iron, wherein it additionally contains vanadium, at the following content of components (mass %): 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   Aluminum 
                   1.5-3.5 
                 
                     
                   Molybdenum 
                   4.5-8.0 
                 
                     
                   Vanadium 
                   1.0-3.5 
                 
                     
                   Iron 
                   1.6-3.8 
                 
                     
                   Titanium 
                   balance