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Schematic overview of the solidification of molten pools during the SLM process: (a) single half-cylindrical molten pool; (b) “layer–layer” molten pool; (c) “track–track” molten pool. The overlaying of molten pools with differently shaped molten pool boundaries (MPBs) of ‘‘fish scale’’ morphology produced in different DAs; (d) DA < 0; (e) DA > 0, respectively.
