20.500.12556/RUL-177378 Fusion behavior of pure magnesium during selective laser melting This study examined the melting behavior and flowability of pure magnesium during selective laser melting. The potential to increase product density was also investigated. Various combinations of manufacturing parameters were considered. The laser power was gradually increased in different machine runs, with different scanning speeds for each run to vary the energy density (ED). The laser power ranged from 10 W to 75 W, and the scanning speed ranged from 100 mm/s to 800 mm/s. Lower laser powers resulted in poor melting, while higher laser powers produced better melting, with significant differences even when the ED was the same. High EDs between 3.50 J/mm² and 4.30 J/mm² led to a lack of melting at low laser power and to an unstable melt pool with significant spattering at high laser power. In contrast, moderate EDs in the range of 1.40 J/mm² to 2.90 J/mm² resulted in better density at high laser power. Higher scanning speeds helped to avoid the formation of a dense smog cloud and provided sufficient energy in a short time with the aid of higher laser power. Therefore, increasing both laser power and scanning speed improved melting performance and increased product density. The relative product density ranged from 80 % to 96.5 %. Reducing the layer thickness from 50 µm to 25 µm at a laser power of 40 W resulted in the formation of a well-formed melt pool in some areas and significant melt spattering in others, which led to a deterioration in density. V raziskavi smo proučevali obnašanje taljenja čistega magnezija in pretočnost njegove taline med selektvinim laserskim taljenjem. Raziskali smo tudi vpliv različnih kombinacij procesnih parametrov na povečanje gostote izdelka. Moč laserja smo postopoma povečevali in pri tem spreminjali hitrosti skeniranja za vsako serijo izdelkov, s čimer smo vplivali na vnos energije v talilni process (ED). Moč laserja se je gibala od 10 W do 75 W, hitrost skeniranja pa od 100 mm/s do 800 mm/s. Z nižjimi močmi laserja nismo dosegli zadovoljivega taljenja materiala, medtem ko so višje moči laserja povzročile boljše taljenje, z znatnimi razlikami tudi pri enakih vnosih energije - ED. Visoka energijska gostota - ED med 3,50 J/mm² in 4,30 J/mm² je povzročila pomanjkljivo taljenje pri nizki moči laserja oziroma nestabilen talilni bazen z znatnim pršenjem materiala pri visoki moči laserja. Nasprotno pa so zmerne ED v območju od 1,40 J/mm² do 2,90 J/mm² povzročile boljšo gostoto pri visoki moči laserja. Višje hitrosti skeniranja so pomagale preprečiti nastanek gostega oblaka smoga in s pomočjo večje laserske moči zagotovile zadostno energijo v kratkem času. Zato je povečanje tako laserske moči kot hitrosti skeniranja izboljšalo učinkovitost taljenja in povečalo gostoto vzorca. Relativna gostota vzorcev se je gibala od 80 % do 96,5 %. Zmanjšanje debeline plasti s 50 µm na 25 µm pri laserski moči 40 W je na nekaterih območjih povzročilo nastanek dobro oblikovanega bazena taline, na drugih pa znatno brizganje taline, kar je povzročilo poslabšanje gostote. magnesium melt pool laser power scanning speed layer thickness support structure laser powder bed fusion magnezij talilni bazen moč laserja hitrost skeniranja debelina plasti nosilna struktura lasersko taljenje praškastega sloja true false true Angleški jezik Slovenski jezik Članek v reviji 2025-12-22 11:47:35 2025-12-22 11:47:42 2025-12-30 04:01:41 0000-00-00 00:00:00 2025 0 0 10 str. no. 9/10 Vol. 71 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.74:629.052:621.375.826 2536-3948 10.5545/sv-jme.2025.1381 259535363 RAZ_Pal_Snehashis_2025.pdf RAZ_Pal_Snehashis_2025.pdf 1 211B9CA111E30FDEA8D415323B0EF960 30720c3cf5ebe3dea2a0e983d7caccbe3a3ea34b0122cd1242a713018749e660 c2d8f150-df23-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=224388 https://www.sv-jme.eu/sl/article/fusion-behaviour-of-pure-magnesium-during-selective-laser-melting/ 1 39ecd928-df23-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=224386 https://dk.um.si/IzpisGradiva.php?id=96199 1 37fbb67f-df23-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=224385 Fakulteta za strojništvo 0 0 0