Measurement of Residual Stresses With Respect to Build Orientation in Components Manufactured by Selective Laser Melting
Selective laser melting (SLM) offers exciting new opportunities for the manufacture of engineering components. However, the use of SLM components is hampered by the need to prove their structural integrity. Large residual stresses are generated by the thermo-mechanical processes of SLM which compromise their structural integrity. These stresses are sensitive to the orientation in which the component is nested on the build plate. Numerical models are therefore required and have been developed to predict the residual stress and distortion in SLM components, supported through thermo-mechanical and creep testing to develop appropriate material models. These models are used to study the influence of building direction on the residual stress profile of parts and develop appropriate mitigation strategies. To validate these models residual stress and distortion measurements are essential. Hence neutron diffraction measurements are proposed on one horizontally built and one vertically built SLM component to provide the data required for model validation and quantify the influence of orientation. This work contributes to the PhD thesis of Mr Richard Williams at Imperial College London.
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DAVIES Catrin; HOOPER Paul; PIRLING Thilo and Richard J Williams. (2019). Measurement of Residual Stresses With Respect to Build Orientation in Components Manufactured by Selective Laser Melting. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-259
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