Surface residual stress analysis of additive manufactured AlSi10Mg alloys

초록

AlSi10Mg is a representative aluminum alloy composition used in additive manufacturing (AM), with good mechanical properties and light weight. However, high energy in the PBF process to overcome heat re-flectivity induces thermal gradients and residual stress (RS) in products. In this study, surface RS in AM AlSi10Mg alloy parts was characterized using various non-destructive methods. The results of X-ray dif-fraction-based analysis (Williamson-Hall plot, sin2 psi, and cos alpha methods) and nanoindentation method were compared. In addition, the electron channeling contrast imaging (ECCI) technique was used for ob-servation of dislocations within precipitates generated and coarsened by heat treatment. In the case of build direction, the tensile RS (46-188 MPa) of in as-built samples changed to compressive RS (28-51 MPa) after heat treatment. All of the applied approaches produced consistent trends in the results, although the W-H plot and nanoindentation methods differed, and the reason for this was discussed.(c) 2023 Elsevier B.V. All rights reserved.

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