3D Residual Stresses in Selective Laser Melted Hastelloy X

2016 Residual Stresses 2016   unpublished
3D residual stresses in as manufactured EOS NickelAlloy HX, produced by laser powder bed additive manufacturing, are analysed on the surface closest to the build-plate. Due to the severe thermal gradient produced during the melting and solidification process, profound amounts of thermal strains are generated. Which can result in unwanted geometrical distortion and effect the mechanical properties of the manufactured component. Measurements were performed using a four-circle goniometer Seifert
more » ... ray machine, equipped with a linear sensitive detector and a Crtube. Evaluation of the residual stresses was conducted using sin 2 ψ method of the Ni {220} diffraction peak, together with material removal technique to obtain in-depth profiles. An analysis of the material is reported. The analysis reveals unwanted residual stresses, and a complicated non-uniform grain structure containing large grains with multiple low angle grain boundaries together with nano-sized grains. Grains are to a large extent, not equiaxed, but rather elongated.
doi:10.21741/9781945291173-13 fatcat:nafrnrqjkneoxmzoo3vpzmzwxa