1998 / Solid Freeform Fabrication Proceedings
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Author W. O'Neill, C.J. Sutcliffe, R. Morgan, K.K.B. Hon, University of Liverpool
Source Solid Freeform Fabrication Proceedings, 1998, pp 147-160
Abstract The development of metallic object construction has occurred at quite a pace over the last five years with provision of many commercial techniques such as indirect and direct sintering of metal powder beds. Althouch porosity is still a major problem for metal building a number of notable solutions have been proposed, these include infiltration with low melting point alloys or direct fusing with binary powder mixtures. Neitheir of these solutions allows one to build components without compromising, part strength and functionality. A process route is required that will allow solid parts to be built from a single powder component without requiring time consuming downstream processes. To this end, the present work examines the feasibility of using low energy high peak power laser pulses from a Q-switched ND:YAG laser to melt stainless steel powder fractions whilst examining the melt displacement throucyh high recoil pressures induced by rapid partial vaporisation of the powder layer. The effect of laser pulse energy, laser beam intensity, pulse frequency, and environmental gas control on the integrity of the fused powder layer is presented. (Auth abstract) [References: 7]
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
or contact:
The University of Texas at Austin
Laboratory for Freeform Fabrication / Texas Materials Institute
Mechanical Engineering Dept.
c/o The Solid Freeform Fabrication Symposium
MC C2200
Austin, TX 78712-1063 USA
512-471-3026; 512-471-7681 FX; Email: sffsymp@uts.cc.utexas.edu