Low-cost high-quality Fe-based shape memory alloys suitable for pipe joints

Setsuo Kajiwara; Albert L. Baruj; Takehiko Kikuchi; Norio Shinya

doi:10.1117/12.484341

13 August 2003 Low-cost high-quality Fe-based shape memory alloys suitable for pipe joints

Setsuo Kajiwara, Albert L. Baruj, Takehiko Kikuchi, Norio Shinya

Proceedings Volume 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics; (2003) https://doi.org/10.1117/12.484341
Event: Smart Structures and Materials, 2003, San Diego, California, United States

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.

Citation Download Citation

Setsuo Kajiwara, Albert L. Baruj, Takehiko Kikuchi, and Norio Shinya "Low-cost high-quality Fe-based shape memory alloys suitable for pipe joints", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); https://doi.org/10.1117/12.484341

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