Abstract
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Highlights
Direct laser deposition (DLD) is a modern prototyping manufacturing technology, which can directly build full-density and high-performance complex metal parts This paper presents an investigation of the influence different scanning strategy on microstructure and mechanical properties of DLD 316L stainless steel sample
Direct laser deposition (DLD) is powder-fed technology that is differ of conventional manufacturing processes in that the material-metallic powder is added to form a desired solid geometry instead of subtracted, as in conventional machining processes [1]
Energy density function ψ [8, 9] was used to optimize the parameters for DLD-process of 316L stainless steel for reason that the scanning speed and laser power, that were recommended in other studies [8, 10] can not be applied due to other possibilities of the machine used in this work
Summary
Direct laser deposition (DLD) is powder-fed technology that is differ of conventional manufacturing processes in that the material-metallic powder is added to form a desired solid geometry instead of subtracted, as in conventional machining processes [1]. As one of the advanced additive manufacturing technologies, it can be used to fabricate functional details of complex shape that are difficult or impossible process by conventional machining processes [2, 3] Such details can be characterized with fine structure (grain size less than 2 μm), the presence of crystallographic texture and porosity. Mechanical properties, microstructure, lattice defects in DLD details depend on deposition process parameters (laser power, powder feed rate, traverse speed, scanning strategy). These parameters effect on size, temperature, cooling rate and direction of heat removing of melted pool [4, 6]. These effects were investigated by fabricating dumb-bell and brick bulk samples while holding other DLD process parameters constant
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