Residual stresses in additively manufactured AlSi10Mg: Raman spectroscopy and X-ray diffraction analysis

Metal parts produced by Additive Manufacturing, and in particular Laser Powder Bed Fusion (LPBF), suffer from residual stresses due to high thermal gradients causing cyclic expansion contraction of the alloy. This work deals with determination stress rapidly solidified AlSi10Mg samples using two non-destructive techniques: Raman spectroscopy, rapid, unconventional but applicable AlSi alloys, XRD (?-method), used as benchmark, being a classical method for determining stresses. Al level was studied both on surface LPBF interior, after in-depth sectioning. employed assess Si. The effect particle size separated distribution Si particles, making suitable study alloys containing free were evaluated also means Williamson-Hall method: are tensile type agreement among all methods. Considering alloy composite, estimated Eshelby's model, showing that larger eutectic particles undergo lower respect nanometric precipitates.