FERROUS SHAPE MEMORY ALLOY TUBE AND ITS PRODUCTION METHOD

Title:

FERROUS SHAPE MEMORY ALLOY TUBE AND ITS PRODUCTION METHOD

Document Type and Number:

Japanese Patent JP2004002981

Kind Code:

A

Abstract:

To provide a ferrous shape memory alloy tube which has improved shape memory property and improved strength by forming precipitations of carbide or nitride, etc., in the alloy, thereby is practically used for a joint tube, and its production method.

In the tube composed of Fe-Mn-Si base shape memory alloy, the shape memory alloy contains at least carbide or nitride of either one of V or Ti and the alloy tube is formed with centrifugal casting. Recovery strain energy becomes large with structure-controlled interaction between local strain and lattice strain in the alloy matrix phase developed at the forming time of the precipitations of carbide or nitride of V or Ti, and thus the shape recovery ratio of the ferrous shape memory alloy tube is clearly improved, and the strength can drastically be improved with the precipitation strengthening action.

Inventors:

NAKAMURA KIMIO
MICHIURA YOSHISADA
KITAGAWA MASAYOSHI
UMEMOTO KOSAKU
KUBO HIROSHI

Application Number:

JP2003083306A

Publication Date:

January 08, 2004

Filing Date:

March 25, 2003

Export Citation:

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Assignee:

KURIMOTO LTD
KUBO HIROSHI

International Classes:

B22D13/02; C21D9/08; C22C38/00; C22C38/14; C22C38/58; (IPC1-7): C22C38/00; B22D13/02; C21D9/08; C22C38/14; C22C38/58

Attorney, Agent or Firm:

Bunji Kamada
Higashio Masahiro
Torii Kazuhisa

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