5 Werkstofftechnik
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Erscheinungsjahr
- 2020 (2) (entfernen)
Dokumenttyp
- Zeitschriftenartikel (1)
- Vortrag (1)
Sprache
- Englisch (2)
Schlagworte
- AISI 316L (1)
- Additive Fertigung (1)
- Additive Manufacturing (1)
- Computed Tomography (1)
- LPBF (1)
- Laser Powder Bed Fusion (1)
- Neutron Diffraction (1)
- Online Process Monitoring (1)
- Residual Stress (1)
- Thermography (1)
- X-ray Diffraction (1)
Organisationseinheit der BAM
- 5 Werkstofftechnik (2)
- 8 Zerstörungsfreie Prüfung (2)
- 8.3 Thermografische Verfahren (2)
- 8.5 Röntgenbildgebung (2)
- 9 Komponentensicherheit (2)
- 5.0 Abteilungsleitung und andere (1)
- 5.1 Mikrostruktur Design und Degradation (1)
- 8.4 Akustische und elektromagnetische Verfahren (1)
- 9.3 Schweißtechnische Fertigungsverfahren (1)
- 9.4 Integrität von Schweißverbindungen (1)
Eingeladener Vortrag
- nein (1)
Rapid cooling rates and steep temperature gradients are characteristic of additively manufactured parts and important factors for the residual stress formation. This study examined the influence of heat accumulation on the distribution of residual stress in two prisms produced by Laser Powder Bed Fusion (LPBF) of austenitic stainless steel 316L. The layers of the prisms were exposed using two different border fill scan strategies: one scanned from the centre to the perimeter and the other from the perimeter to the centre. The goal was to reveal the effect of different heat inputs on samples featuring the same solidification shrinkage. Residual stress was characterised in one plane perpendicular to the building direction at the mid height using Neutron and Lab X-ray diffraction. Thermography data obtained during the build process were analysed in order to correlate the cooling rates and apparent surface temperatures with the residual stress results. Optical microscopy and micro computed tomography were used to correlate defect populations with the residual stress distribution. The two scanning strategies led to residual stress distributions that were typical for additively manufactured components: compressive stresses in the bulk and tensile stresses at the surface. However, due to the different heat accumulation, the maximum residual stress levels differed. We concluded that solidification shrinkage plays a major role in determining the shape of the residual stress distribution, while the temperature gradient mechanism appears to determine the magnitude of peak residual stresses.
In this presentation we discuss the online monitoring of metallic AM parts produced by the Laser Powder Bed Fusion (LPBF) process by using optical, thermographic and electromagnetic methods. In a first approach we present the detection of defects generated during the process and discuss how to improve these methods for the optimization of design and production of metallic AM parts.