|Support type:||Scholarships in Brazil - Post-Doctorate|
|Effective date (Start):||November 01, 2012|
|Effective date (End):||October 31, 2014|
|Field of knowledge:||Engineering - Materials and Metallurgical Engineering - Physical Metallurgy|
|Principal Investigator:||Sebastião Elias Kuri|
|Grantee:||Carlos Alberto Della Rovere|
|Home Institution:||Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil|
Since the discovery of the shape memory effect (SME) in Fe-Mn-Si-Cr-Ni shape memory stainless steels (SMSSs), attention has focused strongly on this new class of shape memory alloys because they combine low production cost, excellent workability and good weldability, and show great promise for constrained recovery applications (e.g., in pipe couplings) in various industrial sectors such as the construction, chemical and petrochemical industries. The SME in Fe-Mn-Si-Cr-Ni SMSSs results from the stress-induced ³ µ martensite transformation and its reversion upon heating. Despite their unique properties, Fe-Mn-Si-Cr-Ni SMSSs are currently only used in a few practical applications. Their incomplete SME, low recoverable strains (less than about 2% without treatment) and poor corrosion resistance are the main obstacles to the use of Fe-Mn-Si-Cr-Ni-(Co) SMSSs in engineering applications. Thus, the present proposal aims to contribute to the advancement of scientific and technological development of Fe-Mn-Si-Cr-Ni-(Co) SMSSs, seeking to find an appropriate way of combining incresead SME with a better corrosion resistance. In this work will be used two measures to increase the corrosion performance of Fe-Mn-Si-Cr-Ni-(NbC) SMSSs: (1) to reduce the Mn content of the Fe-Mn-Si-Cr-Ni SMSS and offsetting the loss of SME through equal channel angular pressing (ECAP) and subsequent aging, and (2) to produce a conventional composition of a Fe-Mn-Si-Cr-Ni SMSS with slight addition of Cerium (Ce). The microsctructure of alloys will be characterized by x-ray diffraction (DRX), and optical and scanning electron microscopy (SEM). The SME will be evaluated by differential scanning calorimetry (DSC), traditional bending method and tensite tests. The corrosion behavior will be studied based on immersion tests, electrochemical techniques, X-ray photoelectron spectroscopy (XPS) analyses.