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Heat transfer and fluid flow in additive manufacturing

00:00 Introduction 02:23 Importance of heat transfer calculations 10:11 Heat conduction models 13:39 Limitations of heat conduction calculations 18:47 What drives the flow of liquid metal? 21:15 Selected results 29:38 Main contributions The microstructure, properties, and performance of additively manufactured metallic parts depend on the grain structure, phase composition, and defects, which are affected by heat transfer and liquid metal flow. Physics-based models of heat transfer in additive manufacturing can provide transient temperature fields, fusion zone geometry, cooling rates, solidification parameters, and defects in parts, which are needed to understand their microstructure, properties, and performance. Here we discuss how heat transfer calculations are done using simple and elegant heat conduction models in part scale and review the limitations of these calculations. Finally, we examine how these limitations are overcome in models that consider the flow of liquid metal in the molten pool. This presentation is a part of India - UK SPARC Webinar on Metal Additive Manufacturing And Friction Stir Processing: Present And Future, Ministry of Human Resource Development, 6 - 7 September 2022 #additivemanufacturing #3dprinting #modeling #selectivelasermelting #manufacturing #directedenergydeposition #heattransfer #fluidflow