Effect of Ti Element on Martensitic Transformations in Fe-Ni-x%Ti Alloys

Abstract

This study investigated the morphological, magnetic, mechanical, and thermal properties of Fe-28.2%Ni-0.5%Ti, Fe-26.8%Ni-1.5%Ti, and Fe-27.6%Ni-4.2%Ti alloys. Scanning Electron Microscope (SEM), Mössbauer Spectrometer, Differential Scanning Calorimetry (DSC), and Vickers hardness were used to determine the physical properties of the alloys. In SEM examinations, a high amount of lath (rod) type martensite formation was observed in Fe-28.2%Ni-0.5%Ti, Fe-26.8%Ni-1.5%Ti alloys. In contrast, in Fe-27.6%Ni-4.2%Ti alloy, lenticular (spindle) type martensite formation with partial twinning was observed in addition to rod (lath) martensites. We determined Mössbauer parameters such as Hyperfine Magnetic Field (Heff), Quadrupole Shift (Q.S), Isomer Shift (I.S), Line Width (W), and percent fraction fields of phases. It has been found that Mössbauer spectra at room temperature are formed by the overlap of two sextet spectra belonging to the ferromagnetic or antiferromagnetic martensite phase and one single spectrum belonging to the paramagnetic austenite phase. We determined morphological change, martensitic transformation start temperature (Ms), austenite phase transformation start temperature (As), and hardness values depending on Ti amount.

Keywords

• Fe based alloys
• Martensitic transformation
• Mössbauer Spectroscopy
• Vickers hardness
• Differential Scanning Calorimetry
• Scanning Electron Microscope

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