Titanium material

Abstract

There is provide a titanium material containing 91% by mass or more of titanium, wherein a tensile strength σB MPa and a fracture elongation δ% of the titanium material have a relation of the following formula I:σ⁢B≥1,TagBox[",", "NumberComma", Rule[SyntaxForm, "0"]]600-30⁢δ;Formula⁢Iin the above formula I, σB≥400 and δ≥20.

1 . A titanium material comprising 91% by mass or more of titanium,
 wherein a tensile strength σB MPa and a fracture elongation δ% of the titanium material have a relation of the following formula I:   
       
         
           
             
               
                 
                   
                     
                       
                         σ 
                         ⁢ 
                         B 
                       
                       ≥ 
                       
                         
                           1 
                           
                             , 
                             TagBox[",", "NumberComma", Rule[SyntaxForm, "0"]] 
                           
                           600 
                         
                         - 
                         
                           30 
                           ⁢ 
                           δ 
                         
                       
                     
                     ; 
                   
                 
                 
                   
                     Formula 
                     ⁢ 
                         
                     I 
                   
                 
               
             
           
         
         in the above formula I, σB 400 and δ≥20, 
         an average grain diameter of crystal grains constituting the titanium material is 1 μm or more and 1,000 μm or less; and 
         the titanium material comprises 50% by mass or more of titanium having a crystal structure of an omega phase. 
       
     
     
         2 . The titanium material according to  claim 1 , wherein the titanium material comprises 98.8% by mass or more of titanium. 
     
     
         3 . A titanium material comprising 91% by mass or more of titanium,
 wherein a 0.2% yield strength σ 0.2  MPa in a tensile test of the titanium material and a content c % by mass of components other than titanium in the titanium material have a relation of the following formula II:   
       
         
           
             
               
                 
                   
                     
                       
                         σ 
                         0.2 
                       
                       > 
                       
                         
                           600 
                           ⁢ 
                           c 
                         
                         + 
                         180 
                       
                     
                     ; 
                   
                 
                 
                   
                     Formula 
                     ⁢ 
                         
                     II 
                   
                 
               
             
           
         
         in the above formula II, c is 0 or more and 9 or less, 
         an average grain diameter of crystal grains constituting the titanium material is 1 μm or more and 1,000 μm or less; and 
         the titanium material comprises 50% by mass or more of titanium having a crystal structure of an omega phase. 
       
     
     
         4 . The titanium material according to  claim 3 , wherein the titanium material comprises 98.8% by mass or more of titanium. 
     
     
         5 . A titanium material comprising 91% by mass or more of titanium,
 wherein a tensile strength σB MPa of the titanium material and a content c % by mass of components other than titanium in the titanium material have a relation of the following formula III:   
       
         
           
             
               
                 
                   
                     
                       
                         σ 
                         ⁢ 
                         B 
                       
                       > 
                       
                         
                           600 
                           ⁢ 
                           c 
                         
                         + 
                         280 
                       
                     
                     ; 
                   
                 
                 
                   
                     Formula 
                     ⁢ 
                         
                     III 
                   
                 
               
             
           
         
         in the above formula III, c is 0 or more and 9 or less, 
         an average grain diameter of crystal grains constituting the titanium material is 1 μm or more and 1,000 μm or less; and 
         the titanium material comprises 50% by mass or more of titanium having a crystal structure of an omega phase. 
       
     
     
         6 . The titanium material according to  claim 5 , wherein the titanium material comprises 98.8% by mass or more of titanium. 
     
     
         7 . The titanium material according to  claim 5 ,
 wherein the tensile strength σB MPa and a fracture elongation δ% of the titanium material have a relation of the following formula I:   
       
         
           
             
               
                 
                   
                     
                       
                         σ 
                         ⁢ 
                         B 
                       
                       ≥ 
                       
                         
                           1 
                           
                             , 
                             TagBox[",", "NumberComma", Rule[SyntaxForm, "0"]] 
                           
                           600 
                         
                         - 
                         
                           30 
                           ⁢ 
                           δ 
                         
                       
                     
                     ; 
                   
                 
                 
                   
                     Formula 
                     ⁢ 
                         
                     I 
                   
                 
               
             
           
         
         in the above formula I, σB≥400 and δ≥20. 
       
     
     
         8 . The titanium material according to  claim 5 ,
 wherein a 0.2% yield strength σ 0.2  MPa in a tensile test of the titanium material and the content c % by mass of components other than titanium in the titanium material have a relation of the following formula II:   
       
         
           
             
               
                 
                   
                     
                       
                         σ 
                         0.2 
                       
                       > 
                       
                         
                           600 
                           ⁢ 
                           c 
                         
                         + 
                         180 
                       
                     
                     ; 
                   
                 
                 
                   
                     Formula 
                     ⁢ 
                         
                     II 
                   
                 
               
             
           
         
         in the above formula II, c is 0 or more and 9 or less. 
       
     
     
         9 . (canceled) 
     
     
         10 . The titanium material according to  claim 1 , wherein a 0.2% yield strength in a compression test of the titanium material is 570 MPa or more. 
     
     
         11 . (canceled) 
     
     
         12 . The titanium material according to  claim 1 , wherein a heat-resistant temperature of the titanium material is 100° C. or more. 
     
     
         13 .- 14 . (canceled) 
     
     
         15 . The titanium material according to  claim 1 ,
 wherein a proportion D90/D10 of a cumulative 90% grain diameter D90 from a small diameter side to a cumulative 10% grain diameter D10 from the small diameter side in a cumulative grain size distribution based on volume of crystal grains constituting the titanium material is 5 or more and 1,000 or less.   
     
     
         16 . The titanium material according to  claim 3 , wherein a 0.2% yield strength in a compression test of the titanium material is 570 MPa or more. 
     
     
         17 . The titanium material according to  claim 3 , wherein a heat-resistant temperature of the titanium material is 100° C. or more. 
     
     
         18 . The titanium material according to  claim 3 ,
 wherein a proportion D90/D10 of a cumulative 90% grain diameter D90 from a small diameter side to a cumulative 10% grain diameter D10 from the small diameter side in a cumulative grain size distribution based on volume of crystal grains constituting the titanium material is 5 or more and 1,000 or less.   
     
     
         19 . The titanium material according to  claim 5 , wherein a 0.2% yield strength in a compression test of the titanium material is 570 MPa or more. 
     
     
         20 . The titanium material according to  claim 5 , wherein a heat-resistant temperature of the titanium material is 100° C. or more. 
     
     
         21 . The titanium material according to  claim 5 ,
 wherein a proportion D90/D10 of a cumulative 90% grain diameter D90 from a small diameter side to a cumulative 10% grain diameter D10 from the small diameter side in a cumulative grain size distribution based on volume of crystal grains constituting the titanium material is 5 or more and 1,000 or less.