20.500.12556/DiRROS-28600 Influence of base plate preheating on laser powder bed fusion–processed EN AW-7075 aluminium aloy 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. laser powder bed fusion (LPBF) EN AW 7075 cracks solidification rate base plate preheat LPBF EN AW 7075 razpoke hitrost strjevanja predgrevanje podlage true false true MDPI Materials Angleški jezik Slovenski jezik © 2026 by the authors Neznano 2026-03-25 11:46:44 2026-03-25 11:46:44 2026-03-27 04:05:34 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Opis vira z dne 25. 3. 2026; str. 1-14 iss. 5, [article no.] 970 Vol. 19 Mar. 2026 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 2026-03-03 620.1:669.715 1996-1944 10.3390/ma19050970 272979203 RAZ_Velikajne_Nejc_2026.pdf RAZ_Velikajne_Nejc_2026.pdf 1 C3AE688D17B78A1F044EADA252444D9E 4bad082ef7dc4bcde561853ec920605a7303952e4e5f8eb8062582146af6d0f5 699c2a31-2838-11f1-aa40-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=42477 https://www.mdpi.com/1996-1944/19/5/970 1 eb4d20a8-2837-11f1-aa40-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=42476 Inštitut za kovinske materiale in tehnologije 0 0 0