Analysis of melting of alloy powder bed with constant heat flux |
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| Affiliation: | 1. Faculty of Physics, Babe?-Bolyai University, Cluj-Napoca, RO-400084, Romania;2. University Grenoble Alpes, Institut NÉEL, 25 rue des martyrs, F-38042, Grenoble, France;3. CNRS, Institut NÉEL, 25 rue des martyrs, F-38042, Grenoble, France;4. INCDTIM, Cluj-Napoca, RO-400293, Romania;5. Electron Microscopy Center, Faculty of Biology & Geology, Babes-Bolyai University, RO-400006, Cluj-Napoca, Romania;1. Babe?-Bolyai University, Faculty of Physics, 400084, Cluj-Napoca, Romania;2. Université Grenoble Alpes, Institut Néel, Grenoble, F 38042, France;3. CNRS, Institut Néel, 25 Rue des Martyrs, F 38042, Grenoble, France;1. Department of Mechanical Engineering, University of Lagos, Akoka, Lagos State, Nigeria;2. Department of Chemical and Petroleum Engineering, University of Lagos, Akoka, Lagos State, Nigeria;3. Department of Civil and Environmental Engineering, University of Lagos, Akoka, Lagos State, Nigeria;1. State Key Laboratory of Precision Measurement Technology and Instrument, Tsinghua University, Beijing 100084, People?s Republic of China;2. Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, People?s Republic of China;3. Graduate School of China Academy of Engineering Physics, Beijing 100088, People?s Republic of China;4. Key Laboratory of Laser Science and Technology, China Academy of Engineering Physics, Mianyang 621900, People?s Republic of China |
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| Abstract: | Melting of an alloy powder bed with constant heat flux for application in selective laser sintering (SLS) is analyzed in this paper. Since melting of an alloy occurs in a range of temperatures, instead of at a single melting point, there will be a mushy zone – containing partially melted powders – between the unmelted region and the completely melted region. The mushy zone can be further divided into two sub-regions: (1) a lower part with constant porosity (shrinkage takes place), and (2) an upper part with constant volume (no shrinkage). Temperature distributions in different regions and locations of melting interfaces are obtained using an integral approximation method. The results show that increasing initial porosity and temperature of the powder bed accelerate the melting process. The melting slows down with increasing thermal conductivity of the interstitial gas. |
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