Abstract
The present study was focused on the assessment of microstructural anisotropy of IN 625 manufactured by selective laser melting (SLM) and its influence on the material’s room temperature tensile properties. Microstructural anisotropy was assessed based on computational and experimental investigations. Tensile specimens were manufactured using four building orientations (along Z, X, Y-axis, and tilted at 45° in the XZ plane) and three different scanning strategies (90°, 67°, and 45°). The simulation of microstructure development in specimens built along the Z-axis, applying all three scanning strategies, showed that the as-built microstructure is strongly textured and is influenced by the scanning strategy. The 45° scanning strategy induced the highest microstructural texture from all scanning strategies used. The monotonic tensile test results highlighted that the material exhibits significant anisotropic properties, depending on both the specimen orientation and the scanning strategy. Regardless of the scanning strategy used, the lowest mechanical performances of IN 625, in terms of strength values, were recorded for specimens built in the vertical position, as compared with all the other orientations.
Highlights
In the last decades, extensive research has been made in the field of advanced manufacturing technologies, focusing primarily on additive manufacturing (AM), to understand the process limitations, and develop different methods to overcome its barriers
In the as-built state, the selective laser melting (SLM) manufactured IN 625 microstructure reveals particular characteristics on different orientations, determined by the layer by layer building process
The lightTheoptical investigation showedof that the SLManisotropy manufactured presentmicroscopy study was focused on the assessment microstructural of SLM IN 625’s microstructure had similarities the microstructure of welds, showing a tensile fish scale morphology in manufactured
Summary
Extensive research has been made in the field of advanced manufacturing technologies, focusing primarily on additive manufacturing (AM), to understand the process limitations, and develop different methods to overcome its barriers. AM methods [1], but in terms of metallic parts manufacturing, two categories of metal AM technologies have been developed: powder bed methods (i.e., SLM, electron beam melting—EBM, and direct metal laser sintering—DMLS) and powder/wire fed methods (laser cladding, direct energy deposition, and laser metal deposition). Even if it was invented more than twenty years ago [2,3], SLM has recently attracted increasing attention.
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