• Elahinia, Mohammad
• Safaei, Keyvan
• Nematollahi, Mohammad Reza
• Abedi, Hossein
• Javan, Reza
• Al-Gamal, Anwar
• Qattawi, Ala

Abstract

<jats:title>Abstract</jats:title><jats:p>NiTi Shape memory alloys are increasingly being employed in a variety of applications, with continuous research into practical processing methods. The laser powder bed fusion (LPBF) manufacturing method is exhibiting increasing attention to fabricating SMA materials due to the high flexibility of controllable process parameters. Finite element method (FEM) approaches are deployed to offer an intelligent fabrication path and minimize the high time and cost expenses of experimentations.</jats:p><jats:p>In this work, a thermal model is developed to predict the melt pool size and shape during NiTi’s LPBF. Macroscale physics framework via COMSOL Multiphysics is used to build a thermal model for NiTi LPBF processing. To this end, a single-track scanning of laser over the NiTi substrate with Gaussian power density has been modeled.</jats:p><jats:p>The thermal/melt pool modeling of a single laser pass on NiTi substrate is employed. The model is calibrated for the thermal parameters such as the conductive and convective coefficient and emissivity coefficients. The calibration is performed through the comparison of experimental temperature measurements via optical microscopy and in-situ thermal imaging and the numerical modeling results.</jats:p>

Topics

• density
• impedance spectroscopy
• melt
• selective laser melting
• positron annihilation lifetime spectroscopy
• Photoacoustic spectroscopy
• optical microscopy
• thermography