2003 / Solid Freeform Fabrication Proceedings
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Author C. Hauser, T. H. C. Childs, C. M. Taylor and M. Badrossamay School Of Mechanical Engineering, University of Leeds, UK S. Akhtar, C. S. Wright and M. Youseffi Engineering Materials Research Group, University of Bradford, Bradford, UK J. Xie, P. Fox and W. O 'Neill Department of Engineering, University of Liverpool, UK
Source Solid Freeform Fabrication Proceedings, 2003, pp 644-655.
Abstract This paper describes progress on the Direct Selective Laser Sintering of M2 and H13 tool steel powders, comparing this with previous and further observations on stainless steel powders. The distinguishing feature is the melting of single tracks and layers in deep powder beds. The paper focuses on changing characteristics of the melt pool (mass, volume, aspect ratio, stability) and laser-powder interactivity as the laser beam width, power and scan speed change. It also compares the melt pool of neighbouring tracks during single layer construction. Simulations from a computer model to predict melt pool shape and dimension show reasonable agreement with experimental results at low scan speeds (0. 5mm/s) . But unexpected increases in melt depth above 1. 0mm/s have been observed, suggesting higher values and more variability in laser absorptivity than expected, even approaching 1. 0 for the CO2 laser radiation used in this work. (Auth abstract) [References: 12] XX
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