Alpha + beta or beta titanium alloy and method for producing same

• US 20140334964A1
• Filed: 12/16/2011
• Published: 11/13/2014
• Est. Priority Date: 11/29/2011
• Status: Active Grant

• Current Assignee: TOHO Titanium Company Limited (ENEOS Holdings, Inc.), Sanyo Special Steel Company Limited (Nippon Steel Corporation)
• Original Assignee: TOHO Titanium Company Limited (ENEOS Holdings, Inc.), Sanyo Special Steel Company Limited (Nippon Steel Corporation)
• Inventors: Kanou, Osamu, Sugawara, Satoshi, Takatori, Hideo
• Granted Patent: US 9,969,004 B2
• Time in Patent Office: Days
• US Class Current: 419/48
• CPC Class Codes: B22F 1/00 Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
• CPC Class Codes: B22F 2003/208 Warm or hot extruding
• CPC Class Codes: B22F 2009/001 from scrap particles
• CPC Class Codes: B22F 3/14 simultaneously
• CPC Class Codes: B22F 3/20 by extruding
• CPC Class Codes: B22F 9/023 Hydrogen absorption
• CPC Class Codes: B22F 9/04 starting from solid material, e.g. by crushing, grinding or milling C22C1/1084 takes precedence; crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C
• CPC Class Codes: C22C 1/0458 Alloys based on titanium, zirconium or hafnium
• CPC Class Codes: C22C 14/00 Alloys based on titanium
• CPC Class Codes: C22F 1/00 Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working apparatus for mechanical working of metal B21, B23, B24
• CPC Class Codes: C22F 1/18 High-melting or refractory metals or alloys based thereon
• CPC Class Codes: C22F 1/183 of titanium or alloys based thereon
• CPC Class Codes: Y02P 10/20 Recycling

Abstract

Titanium alloy containing iron, that is, iron-containing titanium alloy having high strength and hardness in which iron in a composition which cannot be realized in a conventional method, is contained with no segregation, and is provided in lower cost. The α+β titanium alloy or β titanium alloy is produced by a forming process such as hot extrusion of titanium alloy powder containing 3 to 15 mass % of iron powder. The method for production of the α+β titanium alloy or β titanium alloy includes a step of mixing 3 to 15 mass % of iron powder and titanium alloy powder as the remainder, and a step of performing a forming process of hot extrusion on this powder mixture.

Claims

1. α

+β

titanium alloy or β

titanium alloy, the alloy produced by hot extrusion of titanium alloy powder in which 3 to 15 mass % of iron powder is mixed, the alloy containing at least aluminum and vanadium.

2. α

+β

titanium alloy or β

titanium alloy according to claim 1, wherein the titanium alloy powder except for the iron powder is produced by a hydrogenation-dehydrogenation method.

4. α

+β

titanium alloy or β

titanium alloy according to claim 1, wherein the average concentration of iron is within ±

20% of average iron concentration of the alloy itself in the arbitrary range of 500 μ

m of the alloy.

7. α

+β

titanium alloy or β

titanium alloy according to claim 2, wherein the average concentration of iron is within ±

20% of average iron concentration of the alloy itself in the arbitrary range of 500 μ

m of the alloy.

3. (canceled)

8. α

+β

titanium alloy or β

titanium alloy according to claim 3, wherein the average concentration of iron is within ±

20% of average iron concentration of the alloy itself in the arbitrary range of 500 μ

m of the alloy.

5. A method for production of α

+β

titanium alloy or β

titanium alloy, the method comprising the steps of;

mixing process of iron powder from 3 to 15 mass % and titanium alloy powder as the remainder, and

forming process by hot extrusion.

6. The method for production of α

+β

titanium alloy or β

titanium alloy according to claim 5, wherein a temperature of a forming process is in a range of (β

transformation temperature −

100°

C.) to (β

transformation temperature +100°

C.).