On the Grain Microstructure–Mechanical Properties Relationships in Aluminium Alloy Parts Fabricated by Laser Powder Bed Fusion
Recent years witnessed progressive broadening of the practical use of 3D-printed aluminium alloy parts, in particular for specific aerospace applications where weight saving is of great importance. Selective laser melting (SLM) is an intrinsically multi-parametric fabrication technology that offers...
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| Format: | Article |
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MDPI AG
2021-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/8/1175 |
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| author | Pavel A. Somov Eugene S. Statnik Yuliya V. Malakhova Kirill V. Nyaza Alexey I. Salimon Dmitry K. Ryabov Alexander M. Korsunsky |
| author_facet | Pavel A. Somov Eugene S. Statnik Yuliya V. Malakhova Kirill V. Nyaza Alexey I. Salimon Dmitry K. Ryabov Alexander M. Korsunsky |
| author_sort | Pavel A. Somov |
| collection | DOAJ |
| description | Recent years witnessed progressive broadening of the practical use of 3D-printed aluminium alloy parts, in particular for specific aerospace applications where weight saving is of great importance. Selective laser melting (SLM) is an intrinsically multi-parametric fabrication technology that offers multiple means of controlling mechanical properties (elastic moduli, yield strength, and ductility) through the control over grains size, shape, and orientation. Targeted control over mechanical properties is achieved through the tuning of 3D-printing parameters and may even obviate the need of heat treatment or mechanical post-processing. Systematic studies of grain structure for different printing orientations with the help of EBSD techniques in combination with mechanical testing at different dimensional levels are the necessary first steps to implement this agenda. Samples of 3D-printable Al-Mg-Si RS-333 alloy were fabricated in three orientations with respect to the principal build direction and the fast laser beam scanning direction. Sample structure and proper-ties were investigated using a number of techniques, including EBSD, in situ SEM tensile testing, roughness measurements, and nanoindentation. The as-printed samples were found to display strong variation in Young’s modulus values from nanoindentation (from 43 to 66 GPa) and tensile tests (from 54 to 75 GPa), yield stress and ultimate tensile strength (100–195 and 130–220 MPa) in different printing orientations, and almost constant hardness of about 0.8 GPa. A further preliminary study was conducted to assess the effect of surface finishing on the mechanical performance. Surface polishing was seen to reduce Young’s modulus and yield strength but improves ductility, whereas the influence of sandblasting was found to be more controversial. The experimental results are discussed in connection with the grain morphology and orientation. |
| first_indexed | 2024-03-10T08:36:01Z |
| format | Article |
| id | doaj.art-44f8ed5b95f6483398194a1cc083dca8 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T08:36:01Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-44f8ed5b95f6483398194a1cc083dca82023-11-22T08:40:33ZengMDPI AGMetals2075-47012021-07-01118117510.3390/met11081175On the Grain Microstructure–Mechanical Properties Relationships in Aluminium Alloy Parts Fabricated by Laser Powder Bed FusionPavel A. Somov0Eugene S. Statnik1Yuliya V. Malakhova2Kirill V. Nyaza3Alexey I. Salimon4Dmitry K. Ryabov5Alexander M. Korsunsky6HSM Laboratory, Center for Energy Science and Technology, Skoltech, 121205 Moscow, RussiaHSM Laboratory, Center for Energy Science and Technology, Skoltech, 121205 Moscow, RussiaLight Materials and Technologies Institute, UC RUSAL, 121096 Moscow, RussiaLLC “Rusatom–Additive Technology”, Industrial Integrator of the SC Rosatom, 115409 Moscow, RussiaHSM Laboratory, Center for Energy Science and Technology, Skoltech, 121205 Moscow, RussiaLight Materials and Technologies Institute, UC RUSAL, 121096 Moscow, RussiaMBLEM, Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UKRecent years witnessed progressive broadening of the practical use of 3D-printed aluminium alloy parts, in particular for specific aerospace applications where weight saving is of great importance. Selective laser melting (SLM) is an intrinsically multi-parametric fabrication technology that offers multiple means of controlling mechanical properties (elastic moduli, yield strength, and ductility) through the control over grains size, shape, and orientation. Targeted control over mechanical properties is achieved through the tuning of 3D-printing parameters and may even obviate the need of heat treatment or mechanical post-processing. Systematic studies of grain structure for different printing orientations with the help of EBSD techniques in combination with mechanical testing at different dimensional levels are the necessary first steps to implement this agenda. Samples of 3D-printable Al-Mg-Si RS-333 alloy were fabricated in three orientations with respect to the principal build direction and the fast laser beam scanning direction. Sample structure and proper-ties were investigated using a number of techniques, including EBSD, in situ SEM tensile testing, roughness measurements, and nanoindentation. The as-printed samples were found to display strong variation in Young’s modulus values from nanoindentation (from 43 to 66 GPa) and tensile tests (from 54 to 75 GPa), yield stress and ultimate tensile strength (100–195 and 130–220 MPa) in different printing orientations, and almost constant hardness of about 0.8 GPa. A further preliminary study was conducted to assess the effect of surface finishing on the mechanical performance. Surface polishing was seen to reduce Young’s modulus and yield strength but improves ductility, whereas the influence of sandblasting was found to be more controversial. The experimental results are discussed in connection with the grain morphology and orientation.https://www.mdpi.com/2075-4701/11/8/1175RS-333 alloySLM 3DPEBSD reconstructionnanoindentation |
| spellingShingle | Pavel A. Somov Eugene S. Statnik Yuliya V. Malakhova Kirill V. Nyaza Alexey I. Salimon Dmitry K. Ryabov Alexander M. Korsunsky On the Grain Microstructure–Mechanical Properties Relationships in Aluminium Alloy Parts Fabricated by Laser Powder Bed Fusion Metals RS-333 alloy SLM 3DP EBSD reconstruction nanoindentation |
| title | On the Grain Microstructure–Mechanical Properties Relationships in Aluminium Alloy Parts Fabricated by Laser Powder Bed Fusion |
| title_full | On the Grain Microstructure–Mechanical Properties Relationships in Aluminium Alloy Parts Fabricated by Laser Powder Bed Fusion |
| title_fullStr | On the Grain Microstructure–Mechanical Properties Relationships in Aluminium Alloy Parts Fabricated by Laser Powder Bed Fusion |
| title_full_unstemmed | On the Grain Microstructure–Mechanical Properties Relationships in Aluminium Alloy Parts Fabricated by Laser Powder Bed Fusion |
| title_short | On the Grain Microstructure–Mechanical Properties Relationships in Aluminium Alloy Parts Fabricated by Laser Powder Bed Fusion |
| title_sort | on the grain microstructure mechanical properties relationships in aluminium alloy parts fabricated by laser powder bed fusion |
| topic | RS-333 alloy SLM 3DP EBSD reconstruction nanoindentation |
| url | https://www.mdpi.com/2075-4701/11/8/1175 |
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