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High strength alpha/beta titanium alloy

Inactive Publication Date: 2012-03-29
ATI PROPERTIES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ti-6Al-4V alloy cannot be effectively cold worked to increase strength because of, for example, a high incidence of cracking (i.e., workpiece failure) during cold deformation.

Method used

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  • High strength alpha/beta titanium alloy
  • High strength alpha/beta titanium alloy
  • High strength alpha/beta titanium alloy

Examples

Experimental program
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example 1

[0060]Alpha / beta titanium alloy ingots having a composition according to the present disclosure were cast using conventional vacuum arc remelting (VAR), plasma arc melting (PAM), or electron beam cold hearth melting (EB) for primary melting, and were remelted using VAR. The compositions of the ingots were within the ranges listed in the “Non-Limiting Embodiments according to the Present Disclosure” column includes in Table 1 above.

[0061]The ingot compositions produced in this Example 1 had aluminum equivalent values ranging from about 6.0 to about 7.1. The ingots were processed using various hot rolling practices into hot rolled bars and wire having diameters between 0.25 inch (0.635 cm) and 3.25 inch (8.255 cm). Hot rolling was conducted at starting temperatures between 1550° F. (843.3° C.) and 1650° F. (898.9° C.). This temperature range is below the alpha / beta transus temperature of the alloys of this example, which is about 1750° F. to about 1850° F. (about 954.4° C. to about 10...

example 2

[0064]Wire sample nos. 9-11 from Example 1, having a diameter of 0.5 inch (1.27 cm) and aluminum equivalent values of about 6.5, about 6.8 and about 7.15, were tensile tested at room temperature. The results of the tensile tests are displayed graphically in FIG. 2. All of these samples exhibited tensile and yield strengths that are comparable to or higher than strengths exhibited by commercial Ti-6Al-4V alloy. As with FIG. 1, it is seen from FIG. 2 that increasing Aleq results in increased strength, along with an increase in average percent elongation. As discussed above, this trend is surprising and unexpected because it is counter to the generally observed relationship that increasing strength is accompanied by decreasing ductility. There is less scatter in the data of FIG. 2, which is representative of testing done on samples of the same size, as compared with FIG. 1, which is representative of testing done on samples of various sizes, because mechanical properties are influenced...

example 3

[0065]Hot rolled 1 inch (2.54 cm) thick plate samples were fabricated from ingots manufactured according to steps described in Example 1. The alloys ingots had compositions within the ranges listed in the “Non-Limiting Embodiments according to the Present Disclosure” column in Table 1 above, with aluminum and oxygen concentrations and aluminum equivalent values as listed in Table 3.

TABLE 3SampleDiameterAlFeOAleqNo.(in.)(wt. %)(wt. %)(wt. %)(Al % + 10 · O %)1814.081.530.246.431914.131.440.246.482014.221.490.297.122114.251.400.287.052214.211.380.297.08

[0066]All hot rolling temperatures were below the alpha / beta transus temperatures of the alloys. The alloys had Aleq values from about 6.5 to about 7.1. Room temperature tensile testing was used to determine tensile strength, yield strength, and percent elongation (ductility). The results of tensile testing are displayed graphically in FIG. 3. It is seen From FIG. 3 that alloys including increased levels of Al and O, as indicated by calc...

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Abstract

An alpha / beta titanium alloy comprising, in percent by weight based on total alloy weight: 3.9 to 4.5 aluminum; 2.2 to 3.0 vanadium; 1.2 to 1.8 iron; 0.24 to 0.30 oxygen; up to 0.08 carbon; up to 0.05 nitrogen; up to 0.015 hydrogen ; titanium; and up to a total of 0.30 of other elements. A non-limiting embodiment of the alpha / beta titanium alloy comprises an aluminum equivalent value in the range of 6.4 to 7.2, exhibits a yield strength in the range of 120 ksi (827.4 MPa) to 155 ksi (1,069 MPa), exhibits an ultimate tensile strength in the range of 130 ksi (896.3 MPa) to 165 ksi (1,138 MPa), and exhibits a ductility in the range of 12 to 30 percent elongation.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation-in-part application claiming priority under 35 U.S.C. §120 from co-pending U.S. patent application Ser. No. 12 / 903,851, filed on Oct. 13, 2010, and entitled “High Strength Alpha / Beta Titanium Alloy Fasteners and Fastener Stock, which is a continuation-in-part application claiming priority under 35 U.S.C. §120 from co-pending U.S. patent application Ser. No. 12 / 888,699, filed on Sep. 23, 2010, and entitled “High Strength Alpha / Beta Titanium Alloy Fasteners and Fastener Stock”. The entire disclosures of application Ser. Nos. 12 / 903,851 and 12 / 888,699 are hereby incorporated by reference herein.BACKGROUND OF THE TECHNOLOGY[0002]1. Field of the Technology[0003]The present disclosure relates to high strength and ductile alpha / beta titanium alloys.[0004]2. Description of the Background of the Technology[0005]Titanium alloys typically exhibit a high strength-to-weight ratio, are corrosion resistant, and ...

Claims

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Application Information

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IPC IPC(8): C22C14/00
CPCA61L27/06B62D29/008C22F1/183C22F1/18C22C14/00B62D29/00
Inventor BRYAN, DAVID J.MANTIONE, JOHN V.BAYHA, THOMAS D.
Owner ATI PROPERTIES LLC
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