Yazar "Harrysson, Ola" seçeneğine göre listele

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    Characterization of Ni-Ti alloy powders for use in additive manufacturing
    (Pleiades Publishing Inc, 2018) Altuğ Pedük, Gözde Sultan; Dilibal, Savaş; Harrysson, Ola; Özbek, Sunullah; West, Harvey
    Additive manufacturing (AM) offers a fully integrated fabrication solution within many engineering applications. Particularly, it provides attractive processing alternatives for nickel-titanium (Ni-Ti) alloys to overcome traditional manufacturing challenges through layer by layer approach. Among powder-based additive manufacturing processes, the laser beam melting (LBM) and the electron beam melting (EBM) are two promising manufacturing methods for Ni-Ti shape memory alloys. In these methods, the physical characteristics of the powder used as raw material in the process have a significant effect on the powder transformation, deposition, and powder-beam interaction. Thus, the final manufactured material properties are highly affected by the properties of the powder particles. In this study, the Ni - Ti powder characteristics are investigated in terms of particle size, density, distribution and chemical properties using EDS, OM, and SEM analyses in order to determine their compatibility in the EBM process. The solidification microstructure, and after built microstructure are also examined for the gas atomized Ni-Ti powders.
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    Experimental investigation on the EBM-based additively manufactured prismatic nickel–titanium SMA components
    (Pleiades Publishing Inc, 2021) Altuğ Pedük, Gözde Sultan; Dilibal, Savaş; Harrysson, Ola; Özbek, Sunullah
    Additive manufacturing (AM) of the nickel-titanium (NiTi) shape memory alloys (SMA) have provided novel component solutions with a variety of design configurations in the industry. Electron beam melting (EBM) is a trending metal additive manufacturing process for industrial applications in the field of biomedical and aerospace engineering. In this study, experimental investigations were conducted to reveal the effect of processing conditions on the microstructure and hardness properties of EBM-fabricated nickel-titanium components. Furthermore, detailed microstructural characterizations were performed with a scanning electron microscope, EDS, and XRD for unveiling of the microscopic structure and phase analysis during the layer by layer solidification. The experimental results were systematically evaluated for the powder and the bulk prismatic components, respectively.