Pandora’s Box–Influence of Contour Parameters on Roughness and Subsurface Residual Stresses in Laser Powder Bed Fusion of Ti-6Al-4V
| Autor: | Sergei Evsevleev, Giovanni Bruno, Joachim Gussone, Guillermo Requena, Katia Artzt, Jan Haubrich, Peter-Philipp Bauer, Tatiana Mishurova, Pere Barriobero-Vila |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Universitat Politècnica de Catalunya. CIEFMA-PROCOMAME - Disseny Microestructural i Fabricació Avançada de Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Fabricació additiva Residual stress 02 engineering and technology Surface finish lcsh:Technology law.invention 020901 industrial engineering & automation law Surface roughness General Materials Science Laser power scaling Titani -- Aliatges Composite material Manufacturing processes Fabricació lcsh:QC120-168.85 Contour scan strategy 021001 nanoscience & nanotechnology Cracking 0210 nano-technology lcsh:TK1-9971 additive manufacturing Materials science Additive manufacturing residual stress Enginyeria dels materials [Àrees temàtiques de la UPC] Article Melt pool monitoring Titanium alloys Synchrotron X-ray diffraction Ti-6Al-4V lcsh:Microscopy lcsh:QH201-278.5 lcsh:T contour scan strategy Laser lcsh:TA1-2040 Contour line surface roughness melt pool monitoring lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering synchrotron X-ray diffraction lcsh:Engineering (General). Civil engineering (General) ddc:600 Intensity (heat transfer) |
| Zdroj: | Materials Volume 13 Issue 15 Materials 13(15), 3348 (2020). doi:10.3390/ma13153348 special issue: "Special Issue "Challenges in Additive Manufacturing: From Coupon Studies to Components" / Special Issue Editor: Dr. Jan Haubrich, Guest Editor" Materials, Vol 13, Iss 3348, p 3348 (2020) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma13153348 |
| Popis: | The contour scan strategies in laser powder bed fusion (LPBF) of Ti-6Al-4V were studied at the coupon level. These scan strategies determined the surface qualities and subsurface residual stresses. The correlations to these properties were identified for an optimization of the LPBF processing. The surface roughness and the residual stresses in build direction were linked: combining high laser power and high scan velocities with at least two contour lines substantially reduced the surface roughness, expressed by the arithmetic mean height, from values as high as 30 µ m to 13 µ m, while the residual stresses rose from ~340 to about 800 MPa. At this stress level, manufactured rocket fuel injector components evidenced macroscopic cracking. A scan strategy completing the contour region at 100 W and 1050 mm/s is recommended as a compromise between residual stresses (625 MPa) and surface quality (14.2 µ m). The LPBF builds were monitored with an in-line twin-photodiode-based melt pool monitoring (MPM) system, which revealed a correlation between the intensity quotient I2/I1, the surface roughness, and the residual stresses. Thus, this MPM system can provide a predictive estimate of the surface quality of the samples and resulting residual stresses in the material generated during LPBF. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|