Title:
TITANIUM ALLOY MEMBER AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2012/169305
Kind Code:
A1
Abstract:
Provided is a high-strength titanium alloy member having excellent fatigue resistance, obtaining high strength and high yield strength not only in the surface but also across the entire inside of the member, and also applying a large, deep compression residual stress in the surface vicinity, in the whole of a versatile, inexpensive α-β-type titanium alloy member. Also provided is a production method therefor. The production method comprises: a preparation step for a raw material comprising titanium alloy; a nitriding step in which a nitrogen compound layer and/or a nitrogen solid solution layer is formed on the surface layer of the raw material by nidridation and a nitrogen-containing raw material is prepared; a mixing step in which the raw material and the nitrogen-containing raw material are mixed and a nitrogen-containing mixed material is obtained; a sintering step in which nitrogen-containing mixed materials are bonded together and nitrogen in the nitrogen-containing raw material is uniformly scattered in a solid solution state across the entire interior and a sintered titanium alloy member is obtained; a hot plastic working step in which the sintered titanium alloy member is hot plastic worked and a treated member is obtained and/or a heat treatment step in which the sintered titanium alloy member is heat treated and a treated member is obtained; and a surface treatment step in which compression residual stress is applied to the treated member.
Inventors:
SHIRAISHI TOHRU (JP)
ONO YOSHIKI (JP)
ARAOKA YUJI (JP)
ONO YOSHIKI (JP)
ARAOKA YUJI (JP)
Application Number:
PCT/JP2012/061790
Publication Date:
December 13, 2012
Filing Date:
April 27, 2012
Export Citation:
Assignee:
NHK SPRING CO LTD (JP)
SHIRAISHI TOHRU (JP)
ONO YOSHIKI (JP)
ARAOKA YUJI (JP)
SHIRAISHI TOHRU (JP)
ONO YOSHIKI (JP)
ARAOKA YUJI (JP)
International Classes:
C22C1/04; A61L27/00; B22F1/14; B22F3/24; B24C1/10; C22C14/00; C22F1/18; B22F9/04; C22F1/00
Domestic Patent References:
| WO1996033292A1 | 1996-10-24 |
Foreign References:
| JPH08157987A | 1996-06-18 | |||
| JP2007113120A | 2007-05-10 |
Other References:
See also references of EP 2719781A4
Attorney, Agent or Firm:
SUENARI, Mikio (JP)
End 成 Mikio (JP)
End 成 Mikio (JP)
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Claims:
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