.alpha.-.beta. type titanium alloy
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United States of America Patent
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Feb 1, 2005
Grant Date -
May 29, 2003
app pub date -
Sep 30, 2002
filing date -
Oct 22, 2001
priority date (Note) -
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Abstract
There is provided an .alpha.-.beta. type titanium alloy having a normal-temperature strength equivalent to, or exceeding that of a Ti-6Al-4V alloy generally used as a high-strength titanium alloy, and excellent in hot workability including hot forgeability and subsequent secondary workability, and capable of being hot-worked into a desired shape at a low cost efficiently. There is disclosed an .alpha.-.beta. type titanium alloy having high strength and excellent hot workability wherein 0.08-0.25% C is contained, the tensile strength at room temperature (25.degree. C.) after annealing at 700.degree. C. is 895 MPa or more, the flow stress upon greeble test at 850.degree. C. is 200 MPa or less, and the tensile strength/flow stress ratio is 9 or more. A particularly preferred .alpha.-.beta. type titanium alloy comprises 3-7% Al and 0.08-025% C as .alpha.-stabilizers, and 2.0-6.0% Cr and 0.3-1.0% Fe as .beta.-stabilizers.
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