| Title: | Influence of base plate preheating on laser powder bed fusion–processed EN AW-7075 aluminium aloy |
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| Authors: | ID Velikajne, Nejc (Author)
ID Medved, Jože (Author)
ID Donik, Črtomir (Author)
ID Paulin, Irena (Author) |
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| Files: |  PDF - Presentation file, download (9,47 MB)
MD5: C3AE688D17B78A1F044EADA252444D9E
 URL - Source URL, visit https://www.mdpi.com/1996-1944/19/5/970
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IMT - Institute of Metals and Technology
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| Abstract: | The influence of base plate temperature (25, 100, 200, and 400 °C) on the laser powder bed fusion processing of EN AW 7075 was systematically investigated using microstructural characterisation (LM, SEM, EBSD, GROD), chemical analysis, hardness testing, and thermal simulations across a broad range of process parameters. Moderate preheating at 100 °C and 200 °C showed no significant reduction in crack density or changes in grain morphology compared to processing without preheating. At the highest studied temperature—400 °C—a transition to columnar crack networks was observed, accompanied by modified grain orientation, pronounced stress relaxation, and reduced hardness. Independent of preheating temperature, consistent evaporation of Zn (~1 wt.%) and Mg (~0.3 wt.%) occurred during processing. Thermal simulations qualitatively supported the experimental observations, indicating increased thermal retention and displacement with increasing preheating temperature. The results demonstrate that base plate preheating alone is insufficient to suppress hot cracking in EN AW 7075 and may promote alternative crack-growth mechanisms at elevated temperatures, highlighting the need for alternative alloy or process design strategies. |
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| Keywords: | laser powder bed fusion (LPBF), EN AW 7075, cracks, solidification rate, base plate preheat |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 03.03.2026 |
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| Publisher: | MDPI |
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| Year of publishing: | 2026 |
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| Number of pages: | str. 1-14 |
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| Numbering: | Vol. 19, iss. 5, [article no.] 970 |
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| Source: | Materials |
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| PID: | 20.500.12556/DiRROS-28600  |
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| UDC: | 620.1:669.715 |
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| ISSN on article: | 1996-1944 |
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| DOI: | 10.3390/ma19050970 |
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| COBISS.SI-ID: | 272979203 |
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| Copyright: | © 2026 by the authors |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 25. 3. 2026;
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| Publication date in DiRROS: | 25.03.2026 |
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| Views: | 181 |
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| Downloads: | 129 |
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