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Processing of Alpha/Beta Titanium Alloys

A technology of β titanium alloy and thermal processing, which is applied in the field of producing high-strength α/β titanium alloy

Inactive Publication Date: 2016-09-21
ATI PROPERTIES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there are numerous limitations when using STA heat treatment to achieve high strength in Ti-6Al-4V alloys

Method used

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  • Processing of Alpha/Beta Titanium Alloys
  • Processing of Alpha/Beta Titanium Alloys
  • Processing of Alpha/Beta Titanium Alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Billets from a 5.0 inch diameter cylindrical alloy having surface Average chemical composition (excluding incidental impurities) presented in 2.

[0079] Table 2

[0080] heating

Al

V

Fe

O

N

C

Ti

X

4.36

2.48

1.28

0.272

0.005

0.010

balance

Y

4.10

2.31

1.62

0.187

0.004

0.007

balance

[0081] The 1.0 inch round bars were annealed at 1275°F for 1 hour and air cooled to ambient temperature. The annealed rod was cold worked at ambient temperature using a drawing operation to reduce the diameter of the rod. The amount of cold work performed on the rod during the cold drawing operation is quantified as the percent shrinkage of the circular cross-sectional area of ​​the round rod during cold drawing. The percent cold work achieved was a reduction of area (RA) of 20%, 30% or 40%. For a reduction of area of ​​20%, the drawing operation was performed by a single stretch, and for a r...

Embodiment 2

[0087] A 5 inch diameter cylindrical billet heated X (beta transus 1790°F) having the average chemical composition presented in Table 1 was thermomechanically worked as described in Example 1 to form a , 30% or 40% reduction of area of ​​the round bar. After cold drawing, the rods were directly aged using one of the aging cycles presented in Table 4, followed by air cooling to ambient temperature.

[0088] Table 4

[0089] Aging temperature (°F)

Aging time (hours)

850

1.00

850

8.00

925

4.50

975

2.75

975

4.50

975

6.25

1100

1.00

1100

8.00

[0090] The ultimate tensile strength, yield strength and elongation of each drawn and aged bar were measured at ambient temperature. image 3 The raw data are presented in and in Figure 4 and Table 5 presents the averaged data.

[0091] table 5

[0092]

[0093]Cold drawn and aged alloys exhibit a range of mechanical properties depending o...

Embodiment 3

[0096] Cold drawn round bars having the properties presented in Table 1 were subjected to double shear testing according to NASM 1312-13 (Society of Aerospace Industries, February 1, 2003, which is incorporated herein by reference). The chemical composition of the heating X, the diameter of 0.75 inches and was processed to a reduction of area of ​​40% during the drawing operation as described in Examples 1 and 2. Double shear testing provided an evaluation of the suitability of this combination of chemical and thermomechanical processing of the alloy to produce high-strength fastener materials. A first set of round bars was tested in the as-drawn condition and a second set of round bars was tested after aging at 850°F for 1 hour and air cooling to ambient temperature (850 / 1 / AC). In Table 5 the double shear strength results are presented together with the average values ​​of ultimate tensile strength, yield strength and elongation. The minimum specified values ​​for these mech...

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Abstract

The invention relates to processing of alpha / beta titanium alloys. Processes for forming an article from an [alpha]+[beta] titanium alloy are disclosed. The [alpha]+[beta] titanium alloy includes, in weight percentages, from 2.90 to 5.00 aluminum, from 2.00 to 3.00 vanadium, from 0.40 to 2.00 iron, and from 0.10 to 0.30 oxygen. The [alpha]+[beta] titanium alloy is cold worked at a temperature in the range of ambient temperature to 500 DEG F., and then aged at a temperature in the range of 700 DEG F. to 1200 DEG F.

Description

[0001] This application is a divisional application of the application dated June 27, 2011, the application number is 201180035692.8, and the invention name is "processing of α / β titanium alloy". technical field [0002] The present disclosure relates to processes for producing high strength alpha / beta (α+β) titanium alloys and to products produced by the disclosed processes. Background technique [0003] Titanium and titanium-based alloys are used in a variety of applications due to the relatively high strength, low density and good corrosion resistance of these materials. For example, titanium and titanium-based alloys are widely used in the aerospace industry because of the material's high strength-to-weight ratio and corrosion resistance. A group of titanium alloys known to be widely used in a variety of applications is the α / β(α+β)Ti-6Al-4V alloy, which contains by weight 6% aluminum, 4% vanadium, less than 0.20% oxygen and the nominal composition of titanium. [0004...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C14/00
CPCC22C14/00C22F1/183C22F1/18C21D1/26
Inventor D·J·布莱恩
Owner ATI PROPERTIES LLC
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