Welding characteristics and microstructure of an industrially processed Fe-Mn-Al-Ni shape memory alloy joined by tungsten inert gas welding

Abstract Iron-based shape memory alloys have recently attracted increased attention due to their low material costs combined with good workability and high transformation strains. They show excellent welding properties, as shown by several studies compared non-iron-based alloys, are potential candidate materials for large-scale application damping elements in building structures. Since subsequent heat treatment is only possible a limited extent components, it necessary minimize the effects of processing operations on properties. Therefore, suitable microstructure must be established heat-affected zone fusion during process. Thus, industrially processed polycrystalline Fe-Mn-Al-Ni was joined tungsten inert gas matching filler material. The phases formed upon different parameters were investigated using optical microscopy, scanning electron microscopy X-ray diffraction. Shielding composition well mean arc linear energy huge impact ?-phase precipitation. Intercrystalline cracking can supressed increasing ? content. Further, ?-fraction grain size controlled parameters. Ultimately, hardness value equal heat-treated achieved which suggests that may able transfer stress required martensitic transformation.