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Beta-Type Titanium Alloy

a titanium alloy and beta-type technology, applied in the field of beta-type titanium alloy, can solve the problems of deteriorating workability, high deformation resistance, limited application to special fields, etc., and achieve excellent cold workability, excellent strength, and excellent cold workability.

Inactive Publication Date: 2008-04-24
SUMITOMO METAL IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] According to the present invention, it is possible to provide a titanium alloy that is more excellent in strength than the Ti-20V-4Al-1Sn β-type titanium alloy due to the solid solution hardening action, while having excellent cold workability as compared with a Ti-20V-4Al-1Snβ-type titanium alloy, by containing Fe, Mo and Cr in addition to the V, and specifically containing, by mass %, V: 5 to 15%, Fe: 0.5 to 2.5%, Mo: 0.5 to 6%, and Cr: 0.5 to 5%, wherein the value of XV+2.95XFe+1.5XMo+1.65XCr is from 15 to 23%, in which XV represents the mass % of the V, XFe represents the mass % of the Fe, XMo represents the mass % of the Mo and XCr represents the mass % of the Cr.

Problems solved by technology

Of them, Ti-15V-6Cr-4Al, Ti-13V-9Cr-3Al, Ti-15Mo-5Zr-3Al, Ti-3Al-8V-6Cr-4Mo-4Zr and Ti-13V-11Cr-3Al are high in strength, but have a high deformation resistance in cold working and hot working, deteriorating the workability thereof, and thus are limited in application to special fields.
However, no β-type titanium alloys that have excellent cold workability and a higher strength than Ti-20V-4Al-1Sn have been found through the studies made up to the present, and therefore the above demands have not yet been satisfied.

Method used

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Examples

Experimental program
Comparison scheme
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examples

[0029] Now, the description will be made in more detail for the present invention by citing Examples, without intention to limit the present invention to them.

examples 1 to 11

Comparative Examples 1 to 6

[0030] Each ingot was prepared by button arc melting to have the respective elements contained in each ratio as shown in Table 1, then hot rolled to have a 4 mm thickness plate and then subjected to a solution treatment.

[0031] Each intermediate was cooled to 500° C. at an average cooling rate of 4° C. / sec after the solution treatment, and then stood to cool at room temperature.

[0032] Then, scales were removed, and thus a thin plate specimen of a 1 mm thickness β-type titanium alloy was prepared.

[0033] (Evaluation)

[0034] The respective Examples and Comparative Examples were evaluated in the manners mentioned below.

[0035]

[0036] Hot deformation resistance was determined by the working Formaster test using a test piece (a diameter of 8 mm by a length of 12 mm) cut out from the ingot. Specifically, the test piece was rapidly heated to 900° C. by infra-red radiation, and pressed at a rate of 50 mm / sec with 50% deformation and stress at that time was determ...

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Abstract

Disclosed is a β-titanium alloy consisting of, in weight percent, 5-15% of V, 0.5-2.5% of Fe, 0.5-6% of Mo, 0.5-5% of Cr, 1.5-5% of Al, and the balance of Ti and impurities. When the weight % of V content is expressed as XV, the weight % of Fe content is expressed as XFe, the weight % of Mo content is expressed as XMo, and the weight % of Cr content is expressed as XCr; the value of XV+2.95XFe+1.5XMo+1.65 XCr is 15-23%. Such a β-titanium alloy has excellent cold workability, while having higher strength than Ti-20V-4Al-1Sn β-titanium alloy.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a β-type titanium alloy and a method for heat treatment thereof. BACKGROUND OF THE INVENTION [0002] Titanium alloys are light in weight and high in strength, and of them, there exist titanium alloys called as β-type titanium alloys that comprise only the β-phase, many of which are excellent in cold workability compared with titanium alloys that comprise mainly the α-phase, and many being able to be increased in strength by an aging treatment. [0003] Examples of the known β-type titanium alloys include Ti-20V-4Al-1Sn (Patent Reference 1), Ti-15V-3Cr-3Al-3Sn, Ti-22V-4Al (Patent Reference 2), Ti-15V-6Cr-4Al (Patent Reference 3), Ti-13V-9Cr-3Al, Ti-15Mo-5Zr-3Al, Ti-3Al-8V-6Cr-4Mo-4Zr, Ti-13V-11Cr-3Al, and Ti-4.5Fe-6.8Mo-1.5Al. [0004] Of them, Ti-15V-6Cr-4Al, Ti-13V-9Cr-3Al, Ti-15Mo-5Zr-3Al, Ti-3Al-8V-6Cr-4Mo-4Zr and Ti-13V-11Cr-3Al are high in strength, but have a high deformation resistance in cold working and hot working, ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22F1/18C22C14/00
CPCC22C14/00
Inventor MATSUMOTO, SATOSHI
Owner SUMITOMO METAL IND LTD
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