Titanium alloy sheet material and exhaust system component

Abstract

The invention relates to metallurgy, and more particularly to a sheet material made of titanium alloys that are resistant to high heat and oxidation and exhibit structural stability under prolonged operational exposure to temperatures in a range of up to 800° C. and can be used for manufacturing components of a vehicle exhaust system. The present titanium alloy sheet material for the manufacture of components contains: 1.5-3.0 wt % aluminium, 0.1-0.5 wt % molybdenum, 0.1-0.6 wt % silicon, not more than 0.2 wt % iron, not more than 0.15 wt % oxygen, not more than 0.1 wt % carbon, not more than 0.03 wt % nitrogen, not more than 0.015 wt % hydrogen, and the balance titanium. The sheet material has high creep resistance and oxidation resistance values, as well as a stable structure under prolonged operational exposure to temperatures in a range of up to 800° C. The material is suitable for cold forming.

1 - 7 . (canceled) 
     
     
         8 . Titanium alloy sheet material for manufacture of components extensively operating at high temperatures characterized by the following content of elements in titanium alloy, wt. %: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   Aluminum 
                   1.5-3.0; 
                 
                     
                   Molybdenum 
                   0.1-0.5; 
                 
                     
                   Silicon 
                   0.1-0.6; 
                 
                     
                   Iron 
                   max 0.2; 
                 
                     
                   Oxygen 
                   max 0.15; 
                 
                     
                   Carbon 
                   max 0.1; 
                 
                     
                   Nitrogen 
                   max 0.03; 
                 
                     
                   Hydrogen 
                   max 0.015; 
                 
                     
                   Balance- Ti. 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         9 . Sheet material as per  claim 8  characterized by the Mo to Si ratio (wt. %) of alloy comprising 0.4-3. 
     
     
         10 . Sheet material as per  claim 8  characterized by the average α-phase grain size varying from 5 to 100 μm. 
     
     
         11 . Sheet material as per  claim 8  characterized as containing at least 95 vol. % of α-phase. 
     
     
         12 . Sheet material as per  claim 8  characterized by the total content of β-phase and intermetallic particles of titanium silicide comprising 0.5-5 vol. %. 
     
     
         13 . Sheet material as per  claim 8  characterized by the fact that it is made in the form of flat rolled product with up to 6 mm thickness. 
     
     
         14 . Vehicle exhaust system component extensively operating at high temperatures and made of titanium alloy sheet material characterized by the fact that it is made of sheet material of  claim 8 . 
     
     
         15 . A titanium alloy sheet material, comprising:
 titanium;   aluminum in a weight percent of 1.5-3.0;   molybdenum in a weight percent of 0.1-0.5;   silicon in a weight percent of 0.1-0.6;   iron in a weight percent of 0-0.2;   oxygen in a weight percent of 0-0.15;   carbon in a weight percent of 0-0.1;   nitrogen in a weight percent of 0-0.03; and   hydrogen in a weight percent of 0-0.015.   
     
     
         16 . Sheet material as per  claim 15 , wherein the Mo to Si ratio (wt. %) of alloy is between 0.4-3. 
     
     
         17 . Sheet material as per  claim 15 , wherein the average α-phase grain size varies from 5 to 100 μm. 
     
     
         18 . Sheet material as per  claim 15 , containing at least 95 vol. % of α-phase. 
     
     
         19 . Sheet material as per  claim 15 , wherein the total content of β-phase and intermetallic particles of titanium silicide is between 0.5-5 vol. %. 
     
     
         20 . Sheet material as per  claim 15 , made in the form of flat rolled product with up to 6 mm thickness. 
     
     
         21 . Vehicle exhaust system component extensively operating at high temperatures and of titanium alloy sheet material formed of sheet material of  claim 15 .