Effect of hatch spacing on bead geometry during blown powder laser additive manufacturing

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Authors
  1. Munro, C.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
Defence Research and Development Canada (DRDC) has been acting in a scientific support role to Fleet Maintenance Facility Cape Scott (FMFCS) to develop and exploit capabilities in blown-powder laser additive manufacturing (BPLAM) for defence applications. This support is necessary to achieve maximum performance for parts made from each alloy of interest to the Royal Canadian Navy (RCN). The present study was conducted on Monel K500, a useful naval alloy with high strength and corrosion resistance. The objective was to understand the effect of hatch spacing on the geometric features of layers of beads deposited using the FMFCS system. An understanding of this relationship is necessary for the equipment operator to easily choose the correct hatch spacing so that a sound part can be made by the machine that matches the 3D computer model. Groups of three beads of Monel K500 were deposited on bar stock of the same alloy with different amounts of bead overlap. The geometric features of the bead groups, and of individual beads within each group, were measured and compared to the percent overlap. This allowed the creation of charts that can be used by the equipment operator to understand how their choice of hatch spacing affects layer thickness, capture efficiency, and fusion with the previous layer when using this Monel K500 powder. Furthermore, the quantitative data gathered by this study can be used in future work to develop a model of bead deposition applicable to other alloys of

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Keywords
Laser additive manufacturing;Monel K500;Hatch spacing
Report Number
DRDC-RDDC-2017-R069 — Scientific Report
Date of publication
01 May 2017
Number of Pages
46
DSTKIM No
CA055093
CANDIS No
805479
Format(s):
Electronic Document(PDF)

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