Computed tomography for characterization of fatigue performance of selective laser melted parts |
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Affiliation: | 1. Additive Manufacturing and 3D Printing Research Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdom;2. Bioengineering Research Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdom;1. Additive Manufacturing & 3D Printing Research Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK;2. Bioengineering Research Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK;3. Power Electronics Machines & Control Research Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK;4. Advanced Manufacturing Research Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK |
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Abstract: | Components manufactured by maturing additive manufacturing techniques like selective laser melting (SLM) find potential competence in several applications especially in automotive and aerospace industries as well as in medical applications like customized implants. The manufactured parts possess better, or at least comparable, yield strength and tensile strength values accompanied with a reduced fracture strain. Though their fatigue performance in the as-built condition is impaired due to surface roughness, it can be sufficiently improved by post-process surface treatments. Even then, there exists a high fatigue scatter due to remnant porosity. Characterization of remnant porosity is necessary for a reliable component design to be employed for cyclic applications. Computed tomography has been used in this study to evaluate the influence of porosity-incited stress concentration on the corresponding fatigue scatter. Microscopic analysis, tensile tests, fatigue tests with continuous load increase and constant amplitudes as well as finite element analysis have been used for this purpose. Critical pore characteristics and a modification in the process scanning strategy have been recommended so that the components can be reliably used in fatigue-loaded applications. |
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Keywords: | Selective laser melting (SLM) Stress concentration factor Porosity Computed tomography Fatigue Regional re-melting |
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