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Proceedings Paper

Low-cost high-quality Fe-based shape memory alloys suitable for pipe joints
Author(s): Setsuo Kajiwara; Albert L. Baruj; Takehiko Kikuchi; Norio Shinya
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Paper Abstract

By addition of small amount of Nb and C to the conventional Fe-Mn-Si based shape memory alloys, shape memory properties are greatly improved in such an extent that the costly 'training' heat treatment is no more necessary. The key to this remarkable improvement of shape memory effect is to produce small NbC precipitates of about several nm in size in austenite. In order to generate such very small NbC particles, the sample is firstly rolled at 870 K and then aged at 1070 K. An example of Fe-28Mn-6Si-5Cr-0.53Nb-0.06C (mass %) alloy is shown; 95% shape recovery for initial strain of 4% is obtained and the shape recovery stress of about 300 MPa is attained for the sample pre-rolled 14%, which is well above the criterion for industry application of pipe jointing. A pipe jointing with this material is demonstrated.

Paper Details

Date Published: 13 August 2003
PDF: 12 pages
Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); doi: 10.1117/12.484341
Show Author Affiliations
Setsuo Kajiwara, National Institute for Materials Science (Japan)
Albert L. Baruj, National Institute for Materials Science (Japan)
Takehiko Kikuchi, National Institute for Materials Science (Japan)
Norio Shinya, National Institute for Materials Science (Japan)


Published in SPIE Proceedings Vol. 5053:
Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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