Alpha + beta or beta TITANIUM ALLOY AND METHOD FOR PRODUCTION THEREOF

a titanium alloy and beta-beta technology, applied in the field of titanium alloys, can solve the problems of limiting the improvement of above properties of alloys, 64 alloys are difficult to be assembled in complicated structure parts, and it is difficult to add more than 1% titanium, so as to achieve superior yield strength, tensile strength and hardness.

Inactive Publication Date: 2018-04-19
TOHO TITANIUM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The method effectively produces titanium alloys with improved strength, hardness, and uniform copper distribution, achieving mechanical properties superior to conventional methods, while reducing production costs by up to 50-70% and enhancing their suitability for high-strength applications.

Problems solved by technology

However, there is one problem in that the 64 alloy is difficult to be assembled in complicated structure parts since it has inferior workability.
However, it is difficult to add more than 1% to titanium since copper would be segregated greatly in titanium.
Therefore, there is a limitation of further improvement in above properties of the alloys, and the problem remains to be solved.
However, although the raw powder mixing method is promising on a laboratory scale experiment, there are big hurdles to overcome the cost reducing solution in the actual production scales, and the raw powder mixing method is merely in practical use, and moreover, there is no report of production of titanium alloy containing copper in high concentration.

Method used

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  • Alpha + beta or beta TITANIUM ALLOY AND METHOD FOR PRODUCTION THEREOF
  • Alpha + beta or beta TITANIUM ALLOY AND METHOD FOR PRODUCTION THEREOF
  • Alpha + beta or beta TITANIUM ALLOY AND METHOD FOR PRODUCTION THEREOF

Examples

Experimental program
Comparison scheme
Effect test

example 3

(Copper Concentration Distribution of Titanium Material Produced)

[0103]Concentration of composition in crystal structure of titanium material produced by pressing and forming in Example 2 was investigated by EPMA. Regarding Ti, Al, V, and Cu, each X-ray image was measured. These images are shown in FIGS. 3A-3D, and the results were as follows. The number shown here means count number of EPMA, and sensitivity is different in each element. Therefore, due to conversion of the count number to concentration, defining an average count number as a nominal concentration of each element, the correction coefficient of concentration was calculated as shown in Table 6. Based on this correction coefficient, existence ratio for each concentration was calculated as shown in Tables 7 and 8. The minimal concentration and the maximal concentration in each element were as follows.

[0104]Ti (Average concentration 85.5%): Minimal concentration 74.8% and maximal concentration 96.3%

[0105]Al (Average concen...

example 4

(Cu Added 5% to Ti-10V-2Fe-3Al Alloy Powder)

[0115]Cut chips and cut powder of Ti-10V-2Fe-3Al alloy ingot was hydrogenated to produce hydrogenated product thereof, and it was crushed, ground, and sifted to obtain alloy powder of D50=50 μm. Electrolyzed copper powder used in Example 1 was added at 5% to this powder, so as to obtain mixed powder consisting of Ti-10V-2Fe-3Al alloy powder and electrolyzed copper powder. This mixed powder was charged in a mild steel capsule and was processed by Hot-extrusion. The extrusion was performed after heating for 2 hours at 800° C. Observation of structure, tensile test, hardness measurement, and EPMA observation of the extruded material were performed. The crystal particle diameter, yield strength, tensile strength, elongation, and hardness are shown in Table 9.

[0116]By X ray mapping of EPMA in a manner similar to that in Example 3, correction coefficients were calculated according to EPMA count and average concentration of each of Ti, V, Fe, Al,...

example 5

(Cu Powder Added 5% to Ti-15V-3Al-3Cr-3Sn Alloy Powder)

[0118]Cut chips and cut powder of a Ti-15V-3Al-3Cr-3Sn alloy ingot was hydrogenated to produce a hydrogenated product thereof, and it was crushed, ground, and sifted to obtain an alloy powder of D50=50 μm. Electrolyzed copper powder used in Example 1 was added at 5% to this powder, so as to obtain mixed powder consisting of Ti-15V-3Al-3Cr-3Sn alloy powder and electrolyzed copper powder. This mixed powder was inserted in a mild steel capsule and was processed by Hot-extrusion. The extrusion was performed after heating for 2 hours at 750° C. Observation of structure, tensile test, hardness measurement, and EPMA observation of the extruded material were performed. The crystal particle diameter, yield strength, tensile strength, elongation, and hardness are shown in Table 9.

[0119]By X-ray mapping of EPMA in a manner similar to that in Example 3, correction coefficients were calculated according to EPMA count and average concentratio...

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Abstract

A titanium alloy containing copper, which cannot be realized by a conventional method, is provided, having a composition in which copper is contained in titanium with no segregation, and having improved strength and hardness. In addition a method is also provided, in which the titanium alloy is produced at lower cost than in a conventional method. The α+β or β titanium alloy contains copper at 1 to 10 mass %, has a crystal phase of β and α phase or of β phase, is formed of crystal particles not more than 100 μm, and has a copper concentration per an arbitrary specified 1 mm3 portion of the crystal phase at within ±40% compared to another arbitrary specified portion. The α+β or β titanium alloy is produced by mixing 1 to 10 mass % of copper powder and the remainder of titanium alloy powder and then pressing and forming while being heated. The method for production of the α+β or β titanium alloy has a step of mixing 1 to 10 mass % of copper powder and the remainder of titanium alloy powder and a step of pressing and forming the mixture while being heated.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional application of U.S. application Ser. No. 14 / 113,823 filed Oct. 25, 2013, which is a 371 of International Application No. PCT / JP2012 / 061782, filed Apr. 27, 2012, which claims priority to JP 2011-099116, filed Apr. 27, 2011, the contents of each of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to titanium alloys, and in particular, relates to a titanium alloy which has superior mechanical properties, such as strength and hardness, compared to Ti-6Al-4V alloys or the like, and has a composition that cannot be produced by a conventional melting method, and relates to a method for production of the titanium alloy in which the alloy is produced at low cost.BACKGROUND ART[0003]Recently, the demand for titanium alloys has greatly increased due to recent increase in the application fields, not only in the aircraft industry, but also in the field of consumer use. In pa...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C22C1/04B22F9/02B22F3/20C22C14/00B22F3/14
CPCB22F9/023B22F3/20C22C14/00C22C1/0458B22F3/14
InventorKANOU, OSAMUSUGAWARA, SATOSHITAKATORI, HIDEO
OwnerTOHO TITANIUM CO LTD