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Fe Based SMA for Utilization of Damping Effect in Construction Structures and Effect of Nanostructural

Abbasnejad, Vahid | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45345 (07)
  4. University: Sharif University of Technology
  5. Department: Materials science and Engineering
  6. Advisor(s): Sadrnezhaad, Khatiboleslam
  7. Abstract:
  8. To investigate the vibrational damping behavior (for application in construction structures) and shape memory effect of Fe based alloy, quaternary low carbon Fe-30Mn-6Si-6Cr alloy having small amounts of carbon and molybdenum were selected. The experimental samples were produced by melting of commercially pure raw materials and hot rolling, cold rolling and machining of the produced ingots. Nano-precipitation treatment was performed on a sample of specific composition. Chemical composition determination, cyclic tension-compression, simple bending, differential scanning calorimetry (DSC), micro hardness, and microstructural studies by optical and scanning electron microscopes (SEM) were performed. The amounts of Damping level and energy dissipation, Shape recovery ratio (memory effect), Transformation temperatures, Phases and produced Precipitates were investigated.
    Results of this research indicate that the energy absorption effect (vibrational damping) of the Fe-Mn-Si based shape memory alloys is nearly twice the typical structural steels, under normal condition. By applying the Nano-precipitation treatment, the above-mentioned amounts will become 1.3 times of the same alloy without precipitates. The reason for this is claimed to be the operation of the precipitates as a source for partial dislocation multiplication upon stress application. We also indicated that the presence of Nano-sized precipitates in the structure can increase SME of the Fe-Mn-Si based shape memory alloys up to twice its original value
  9. Keywords:
  10. Martensitic Transformation ; Shape Memory Effect ; Nanoprecipitation ; Ferrum Based Shape Memory Alloys ; Vibrational Damping

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