Title : Fabrication of NiTi shape memory alloy using a unique In house developed twin wire arc additive manufacturing system

Because of its near-net manufacturing capabilities, design flexibility, and rapid production capabilities, additive manufacturing has seen a significant increase in popularity during the last ten years. Wire-based additive manufacturing techniques enable the fabrication of metal components with high deposition speeds, cheap material and equipment costs, and excellent structural integrity. In the current investigation, two Gas Metal Arc Welding (GMAW) systems were used to create the Twin-wire Arc Additive Manufacturing (T-WAAM) system. This technique was chosen over alternative wirebased techniques due to its higher deposition rates, simplicity of welding, and reduced cost. The torches were 60 degrees apart, and the two GMAW systems were physically interconnected to encourage alloy formation, melting, and contact. A NiTi shape memory alloy sample was deposited using the optimal settings, and its microstructure, phases, phase transformation temperatures, and mechanical properties were examined. An outstanding uniform bead was produced by the deposition employing the ideal settings. Results from X-ray diffraction (XRD) and scanning electron microscopy (SEM) verified the increased concentration of the Ni3Ti phase, which increases hardness and fracture stress while lowering ductility. According to Diffraction Scanning Calorimetry (DSC), the martensite phase and some austenite are both preserved at normal temperature. The grains are totally crystallized and equiaxed, according to the Electron Backscatter Diffraction (EBSD) measurements. The obtained texture is random, according to the orientation map. 

Rajendra Goud is a Mechanical Engineer, specialised in Manufacturing and Materials. With 7+ years of research experience, his current research focus is industry-oriented. With an emphasis on Additive Manufacturing, Advanced Materials, Shape Memory Alloys, and Surface Modification Engineering, he has filed three Indian patents and authored ten reputed publications, which have resulted in over 130 citations. Rajendra Goud is currently a PhD research scholar at the prestigious Indian Institute of Technology (IIT) Indore, India.