期刊
MATERIALS SCIENCE AND TECHNOLOGY
卷 22, 期 12, 页码 1449-1455出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/174328406X111057
关键词
rapid prototyping; direct metal laser sintering; Cu based metal powder; liquid phase sintering; processing parameters; microstructure
Direct laser sintering of a multicomponent Cu based metal powder was successfully processed through the mechanism of liquid phase sintering with partial melting of the powder. The effects of processing parameters such as laser power, scan speed, scan line spacing and layer thickness on the densification and microstructural evolution of the laser sintered powder were investigated. It was found that with increasing laser power or decreasing scan speed, the density of the sintered parts increased and the microstructures became denser. However, the combination of higher laser powers (> 400 W) and higher scan speeds (>= 0.06 ms(-1)) gave rise to 'balling' effect. A successive transition from discontinuous scan tracks to coherently joined ones occurs with decreasing scan line spacing. Lowering the thickness of the powder layer promises an improvement in bonding coherence between sintered layers. A single factor termed 'energy density by volume' is defined to evaluate the combined effect of various processing parameters on the density of laser sintered powder. With increasing the energy density by volume up to similar to 0-16 U mm(-3), the densification rate is relatively high. However, with intensifying the energy density over similar to 0-23 U mm(-3), the mechanism of particle bonding may change into full melting/solidification, leading to a decrease in the sintered density.
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