Affiliation:
1. Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139
Abstract
Melting of a subcooled powder bed that contains a mixture of two powders with significantly different melting points under a moving Gaussian heat source was investigated numerically. Shrinkage induced by the density change on the melting process was taken into account in the physical model. The problem is formulated using a temperature transforming model and solved by the finite difference method. The results show that the effect of surface heat loss due to convection and radiation is not negligible regardless of whether the shrinkage phenomena is considered. The decrease of moving heat source intensity will result in decrease of the sintering depth and the volume of the liquid pool. The increase of the scanning velocity will decrease the sintering depth and the location and shape of the liquid pool is affected significantly.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference19 articles.
1. Bunnell, D. E., 1995, “Fundamentals of Selective Laser Sintering of Metals,” Ph.D. thesis of the University of Texas at Austin, Austin, TX.
2. Cao
Y.
, and FaghriA., 1990a, “A Numerical Analysis of Phase Change Problems Including Natural Convection,” ASME JOURNAL OF HEAT TRANSFER, Vol. 112, pp. 812–816.
3. Cao
Y.
, and FaghriA., 1990b, “Thermal protection from intense localized moving heat fluxes using phase-change materials,” Int. J. Heat Mass Transfer, Vol. 33, pp. 127–138.
4. Conti
M.
, 1995, “Planar Solidification of a Finite Slab: Effect of the Pressure Dependence of the Freezing Point,” Int. J. Heat Mass Transfer, Vol. 38, pp. 65–70.
5. Crank, J., 1956, The Mathematics of Diffusion, Clarendon, Oxford, UK.
Cited by
47 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献