Effect of electron beam remelting on dispersion of carbon and Oxigen in NiTi alloys with SME

Abstract

The level of impurities, carbon and oxygen, of the NiTi alloy is usually inherent to the melting process or initial raw material. Associated with the formation of precipitates, TiC and Ti4Ni2O, the impurities in the NiTi alloy influence the temperatures of martensitic transformation (MT), i.e, changing the properties of shape memory effect (SME) in the alloy. In this paper aspects of the influence of impurities, carbon and oxygen, in the process of melting by Vacuum Induction Melting (VIM) and Electron Beam Melting (EBM) and remelting by EBM is analyzed by using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and metalografic analysis in order to better understand the influence of those impurities in the SME of the NiTi alloy.

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