US2025243562A1PendingUtilityA1
Titanium alloy sheet and method for producing same
Est. expiryApr 27, 2042(~15.7 yrs left)· nominal 20-yr term from priority
C22F 1/00C22F 1/183C21D 8/0273C21D 8/0226C22F 1/18C22C 14/00C22C 1/02
47
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Claims
Abstract
A titanium alloy sheet includes a predetermined chemical composition, in a case where a crystal orientation of an α-phase is expressed by Euler angles g={φ1, ϕ, φ2} according to Bunge notation, a maximum integration orientation expressed by a crystal orientation distribution function f(g) is in a range of φ1: 0° to 30°, ϕ: 60° to 90°, and φ2: 0° to 60°, a maximum integration in the maximum integration orientation is 10.0 or more, a maximum integration in ranges of φ1: 70° to 90°, ϕ: 70° to 90°, and φ2: 0° to 60° and φ1: 70° to 90°, ϕ: 10° to 30°, and φ2: 0° to 60° is 2.5 or less, and YR in a sheet width direction is 0.99 or less.
Claims
exact text as granted — not AI-modified1 . A titanium alloy sheet comprising, as a chemical composition, by mass %:
Al: 5.0% to 6.6%; Fe: 0.7% to 2.3%; Si: 0.20% to 0.30%; O: 0.10% to 0.20%; C: less than 0.050%; N: 0.050% or less; Ni: 0% or more and less than 0.15%; Cr: 0% or more and less than 0.25%; Mn: 0% or more and less than 0.25%; and a remainder: Ti and impurities, wherein in the chemical composition, in a case where an Al content is denoted by [% Al], an Fe content is denoted by [% Fe], a Si content is denoted by [% Si], and an O content is denoted by [% O], by mass %, Expressions (1) and (2) are satisfied, in a case where a crystal orientation of an α-phase is expressed by Euler angles g={φ1, ϕ, φ2} according to Bunge notation, a maximum integration orientation expressed by a crystal orientation distribution function f(g) is in a range of φ1: 0° to 30°, ϕ: 60° to 90°, and φ2: 0° to 60°, a maximum integration in the maximum integration orientation is 10.0 or more, a maximum integration in ranges of φ1: 70° to 90°, ϕ: 70° to 90°, and φ2: 0° to 60° and φ1: 70° to 90°, ϕ: 10° to 30°, and φ2: 0° to 60° is 2.5 or less, and YR in a sheet width direction is 0.99 or less,
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2 . The titanium alloy sheet according to claim 1 ,
wherein a 0.2% proof stress in the sheet width direction at 25° C. is 1,000 MPa or more, a Young's modulus in the sheet width direction is 135 GPa or more, and a specific gravity is 4.45 g/cm 3 or less.
3 . The titanium alloy sheet according to claim 1 ,
wherein a half width of a diffraction peak at 2θ=53.3±1° detected by an X-ray diffraction method using CuKα as a line source is 0.20° or less.
4 . The titanium alloy sheet according to claim 3 ,
wherein a band structure having an aspect ratio of more than 3.0 and elongated in a longitudinal direction of the sheet is provided, and an area ratio of the band structure is 70% or more.
5 . The titanium alloy sheet according to claim 3 ,
wherein the YR in the sheet width direction is 0.85 or more and 0.97 or less.
6 . The titanium alloy sheet according to claim 4 ,
wherein the YR in the sheet width direction is 0.85 or more and 0.97 or less.
7 . The titanium alloy sheet according to claim 1 ,
wherein a sheet thickness is more than 2.5 mm.
8 . The titanium alloy sheet according to claim 3 ,
wherein a sheet thickness is more than 2.5 mm.
9 . The titanium alloy sheet according to claim 4 ,
wherein a sheet thickness is more than 2.5 mm.
10 . The titanium alloy sheet according to claim 5 ,
wherein a sheet thickness is more than 2.5 mm.
11 . The titanium alloy sheet according to claim 6 ,
wherein a sheet thickness is more than 2.5 mm.
12 . A method for producing a titanium alloy sheet comprising, as a chemical composition, by mass %:
Al: 5.0% to 6.6%; Fe: 0.7% to 2.3%; Si: 0.20% to 0.30%; O: 0.10% to 0.20%; N: 0.050% or less; Ni: 0% or more and less than 0.15%; Cr: 0% or more and less than 0.25%; Mn: 0% or more and less than 0.25%; and a remainder: Ti and impurities, wherein in the chemical composition, in a case where an Al content is denoted by [% Al], an Fe content is denoted by [% Fe], a Si content is denoted by [% Si], and an O content is denoted by [% O], by mass %, Expressions (1) and (2) are satisfied, in a case where a crystal orientation of an α-phase is expressed by Euler angles α={φ1, ϕ, φ2} according to Bunge notation, a maximum integration orientation expressed by a crystal orientation distribution function f(g) is in a range of φ1, 0° to 30°, ϕ: 60° to and φ1: 70° to 90°, ϕ: 10° to 30°, and φ2: 0° to 60° is 2.5 or less, and YR in a sheet width direction is 0.99 or less.
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the method comprising:
heating a titanium material including, as a chemical composition, by mass %, Al: 5.0% to 6.6%, Fe: 0.7% to 2.3%, Si: 0.20% to 0.30%, 0: 0.10% to 0.20%, C: less than 0.050%, N: 0.050% or less, Ni: 0% or more and less than 0.15%, Cr: 0% or more and less than 0.25%, Mn: 0% or more and less than 0.25%, and a remainder: Ti and impurities, to a heating temperature;
hot-rolling the titanium material after the heating in one direction to obtain a hot-rolled sheet;
cooling the hot-rolled sheet after the hot rolling to a coiling temperature of 400° C. or lower at a rate of 8.0° C./s or higher and coiling the hot-rolled sheet at the coiling temperature; and
performing annealing on the hot-rolled sheet after the coiling,
wherein in the heating, the heating temperature is T β ° C. or higher and (T β +150)° C. or lower, where T β is a β-transformation temperature in the unit of ° C.,
in the hot rolling, a rolling reduction is 85% or more, and a finishing temperature is (T β −170)° C. or higher and (T β −100)° C. or lower, and
in the annealing, an annealing temperature T during the annealing is 600° C. or higher and T β or lower, and the annealing temperature T and a holding time t in the unit of second at the annealing temperature satisfy Expression (3),
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13 . The method for producing the titanium alloy sheet according to claim 12 ,
wherein in the annealing, the annealing temperature T during the annealing is 600° C. or higher and T β or lower, and the annealing temperature T and the holding time t in the unit of second at the annealing temperature satisfy Expression (3′),
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14 . The titanium alloy sheet according to claim 2 ,
wherein a half width of a diffraction peak at 2θ=53.3±1° detected by an X-ray diffraction method using CuKα as a line source is 0.20° or less.
15 . The titanium alloy sheet according to claim 2 ,
wherein a sheet thickness is more than 2.5 mm.
16 . The titanium alloy sheet according to claim 14 ,
wherein a band structure having an aspect ratio of more than 3.0 and elongated in a longitudinal direction of the sheet is provided, and an area ratio of the band structure is 70% or more.
17 . The titanium alloy sheet according to claim 14 ,
wherein the YR in the sheet width direction is 0.85 or more and 0.97 or less.
18 . The titanium alloy sheet according to claim 17 ,
wherein the YR in the sheet width direction is 0.85 or more and 0.97 or less.
19 . The titanium alloy sheet according to claim 14 ,
wherein a sheet thickness is more than 2.5 mm.
20 . The titanium alloy sheet according to claim 16 ,
wherein a sheet thickness is more than 2.5 mm.
21 . The titanium alloy sheet according to claim 17 ,
wherein a sheet thickness is more than 2.5 mm.
22 . The titanium alloy sheet according to claim 18 ,
wherein a sheet thickness is more than 2.5 mm.Join the waitlist — get patent alerts
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