Mechanical Properties of AlSi10Mg Processed by Laser Powder Bed Fusion at Elevated Temperature
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AlSi10Mg processed by laser powder bed fusion is expected to have remarkable mechanical properties due to the dominant cellular microstructure. Nevertheless, the as-processed material is known to contain significant residual stresses, as well as a textured microstructure resulting in anisotropic mechanical properties. To mitigate these problems, a retrofitted heating system was used to elevate the process temperature to 200 °C. The characterization results show low levels of porosity, anisotropy, and residual stress. Furthermore, the effect of three heat treatment conditions (as-built, stress relief, and T6) on the tensile properties was investigated. For this purpose, 14 tensile samples were built in seven different orientations. Digital image correlation was used to understand the deformation mechanism for each heat treatment condition. It was observed that the as-built material has comparable properties to the stress relieved condition, while T6 heat treatment resulted in increased ductility. Based on the results, LPBF processing of AlSi10Mg at elevated temperature can potentially eliminate the need for post-process stress relief heat treatment.
KeywordsPowder bed fusion Laser melting Additive manufacturing Residual stress Tensile properties Anisotropy Digital image correlation
The authors acknowledge funding from the Research Council of Norway (grant no. 248243, the MKRAM project) and SINTEF’s strategic project on additive manufacturing, SIP-LAMINA.
- 6.Renishaw plc., Data sheet: AlSi10Mg-0403 (200 W) powder for additive manufacturing, 2019. https://resources.renishaw.com/en/details/data-sheet-alsi10mg-0403-200-w-powder-for-additive-manufacturing–73121. Accessed 20 Aug 2019
- 7.EOS GmbH, EOS Aluminium AlSi10Mg (2019). https://cdn0.scrvt.com/eos/f3f4bf485d78f2dd/b010c05abe97/AlSi10Mg-090-M400_Flexline_Material_data_sheet_09-15_en.pdf. Accessed 20 Aug 2019
- 8.edmit inc., Material Data Sheet CL 30AL/ CL 31AL Aluminium alloy (2019). http://edmitinc.com/download/EDMIT_ALUMINUM_AlSi12_AlSi10Mg.pdf. Accessed Aug 20 2019
- 10.Hovig EW, Holm HD, Sørby K (2019) Effect of processing parameters on the relative density of AlSi10Mg processed by laser powder bed fusion. Singapore, Springer Singapore, pp 268–276Google Scholar
- 13.Reiersen M (2019) Microstructural analysis of SLM AlSi10Mg and Al7075 alloys—topology optimisation in redesigning novel parts to be produced by SLM, Department of Chemistry, University of OsloGoogle Scholar
- 14.Hovig EW, Azar AS, Grytten F, Sørby K, Andreassen E (2019) Determination of anisotropic mechanical properties for materials processed by laser powder bed fusion. Adv Mater Sci EngGoogle Scholar
- 15.Sehrt JT, Witt G, Müller B, Töppel T, Hoeren KPJ, Reinarz B (2015) Less residual stresses in laser beam melting by investigating on supports, powder layer properties, powder preheating and scanning strategies. In: Presentation held at International Symposium on Additive Manufacturing, February 25th-26th, 2015, ISAM, DresdenGoogle Scholar