Titanium alloy and process for producing the same
AssigneeKabushiki Kaisha Toyota Chuo Kenkyusho
InventorsShigeru Kuramoto, Tadahiko Furuta, Junghwan Hwang, Rong Chen, Nobuaki Suzuki, Kazuaki Nishino, Takashi Saito
Life of this patent
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Abstract
A titanium alloy includes at least one alloying element whose molybdenum equivalent “Moeq” is from 3 to 11% by mass, at least one interstitial solution element selected from the group consisting of O, N and C in an amount of from 0.3 to 3% by mass, and the balance of Ti, when the entirety is taken as 100% by mass. Its content of Al is controlled to 1.8% by mass or less, and it is β single phase at room temperature at least.
Claims8
A titanium alloy that is β single phase at room temperature consisting of:
- when the entirety is taken as 100% by mass,
- at least one alloying element selected from the group consisting of molybdenum (Mo), vanadium (V), tungsten (W), niobium (Nb), tantalum (Ta), iron (Fe), chromium (Cr), and copper (Cu) in a molybdenum equivalent “Moeq” of from 3 to 11% by mass, the molybdenum equivalent determined by the following equation,
- Moeq=Momass+0.67Vmass+0.44Wmass+0.28Nbmass+0.22Tamass+2.9Femass+1.6Crmass+0.77Cumass, wherein Momass, Vmass, Wmass, Nbmass, Tamass, Femass, Crmass, and Cumass are expressed in percentages by mass;
- an interstitial solution element that is oxygen (O) in an amount of from 0.6 to 3% by mass;
- and
- the balance of titanium (Ti);
- wherein said titanium alloy is produced by a solution treatment comprising:
- heating a raw titanium alloy material to form a β single phase at a temperature above the α+β/β transformation temperature of the raw titanium alloy material;
- and
- quenching the heated raw titanium alloy material to form a titanium alloy that is a β single phase at room temperature;
- wherein said titanium alloy has a flexibility characterized by a Young's modulus of 70 GPa or less, exhibits a tensile strength of 1,000 MPa or more, and exhibits an elastic deformability of 1.6% or more.
A titanium alloy consisting of:
- when the entirety is taken as 100% by mass,
- at least one alloying element selected from the group consisting of molybdenum (Mo), vanadium (V), tungsten (W), niobium (Nb), tantalum (Ta), iron (Fe), chromium (Cr), and copper (Cu) in a molybdenum equivalent “Moeq” of from 3 to 11% by mass, the molybdenum equivalent determined by the following equation,
- Moeq=Momass+0.67Vmass+0.44Wmass+0.28Nbmass+0.22Tamass+2.9Femass+1.6Crmass+0.77Cumass, wherein Momass, Vmass, Wmass, Nbmass, Tamass, Femass, Crmass, and Cumass are expressed in percentages by mass;
- at least one additional alloying element selected from the group consisting of zirconium (Zr), hafnium (Hf), scandium (Sc), manganese (Mn), tin (Sn) and boron (B) in an amount of from 0.1 to 10% by mass;
- an interstitial solution element that is oxygen (O) in an amount of from 0.6 to 3% by mass;
- and
- the balance of titanium (Ti);
- and
- being β single phase at room temperature;
- wherein said titanium alloy is produced by a solution treatment comprising:
- heating a raw titanium alloy material to form a β single phase at a temperature above the α+β/β transformation temperature of the raw titanium alloy material;
- and
- quenching the heated raw titanium alloy material to form a titanium alloy that is a β single phase at room temperature.
Dependencies are inferred from the claim text.