Heat Source Model: Advantages And Disadvantages Of Additive Modeler Manufacturing

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Abstract. Additive layer manufacturing regarded as the driver of a “third industrial revolution” can give the industry and science significant benefits over existing manufacturing techniques. Yet it has some disadvantages, with one of them being a wide variation of mechanical properties of additive manufactured parts. The mechanical behavior of produced components is known to be profoundly affected by a microstructure, which, in turn, depends on the material and process parameters. In this paper, a two-dimensional numerical model is developed to simulate the grain structure evolution during laser additive manufacturing. The cellular automata method is applied to describe the grain growth. The Goldak’s heat source model is used to define the heat input during laser melting. Selective laser melting process, which involves sequential deposition and melting of powder layers, is considered. First layer is deposited on a polycrystalline substrate. The laser beam moves perpendicular to the area under consideration. The paper discusses the influence of the heat source parameters on the grain…show more content…
A wide range of application domains, including medicine, aerospace, defense, and automotive industries, have benefited [1–3]. The term “ALM” relates to several different types of additive manufacturing, which can be categorized in different ways [2]. Among them are such types as extrusion (fused deposition modeling), wire (electron beam freeform fabrication), powder bed (selective laser melting) types and so on. The ALM technique studied in this work is selective laser melting (SLM) where metal powders are selectively melted by a focused laser beam in layer-by-layer

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