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L-PBF process parameters and scan strategy affect the resultant built quality and structural integrity.
Open image in new window Fig. 13 Interlayer staggering and orthogonal scan strategy [60].
The "island scan strategy" has been developed for parts fabrication, as illustrated in Fig. 12 [39].
However, the effect of laser scan strategy on the properties of finished parts is not well understood.
Scan strategy directly affects the heat transfer, powders melting and solidification, and ultimately defect location and distribution.
This study presents experimental investigations of the effects of process parameters and scan strategy on the relative density, melt pool size and shape.
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Different scan strategies, namely hatching and concentric scanning, were used.
Using this, proposals are suggested for designing laser scan strategies used in SLM.
Open image in new window Fig. 11 Three different scan strategies: "unidirectional" (left), "zigzag" (center), and "cross-hatching" (right) [7].
Generally, three different scan strategies have been utilized in the SLM processes, namely "unidirectional", "zigzag", and "cross-hatching", as shown in Fig. 11 [7].
The stress distribution varied between laser scan strategies and the cause has been determined by observing the thermal history during scanning.
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