1541 KB0 KB199920252025Krishnasamy, SaravanakumarSambasivam, SaravananVaiyampalayam Govindaraj, Balajištevilka:1/2letnik:71str. 21-27COBISSID_HOST:231752963ISSN:2536-3948URN:URN:NBN:SI:doc-OPH08O47enFakulteta za strojništvoStrojniški vestnikheat treatmentnatezna trdnostobločno navarjanje z žico (WAAM)optical microscopeoptični mikroskoptensile strengthtoplotna obdelavawire arc additive manufacturing (WAAM)Microstructural and mechanical characterization of WAAM-fabricated inconel 625| heat treatment effects|Wire arc additive manufacturing (WAAM) is a promising technique for producing complex geometries of nickel-based superalloys, such as Inconel 625. In this work, the microstructure and mechanical properties of Inconel 625 alloy produced by gas tungsten arc welding (GTAW) process of WAAM technology were analyzed to investigate the effects of heat treatment on the top and bottom zones of the multi-layered wall structure. The deposited specimens were heat treated at 980°C for 2 hours, then water quenched (solution annealing). After heat treatment, microstructure reveals that the most common phases like laves, gamma, and mono carbides (MC) are dissolved, which is clear by optical microscopy (OM), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). Even after the heat treatment process, mechanical properties, such as micro-hardness results, demonstrate that the bottom zone of the multilayer wall structure has a higher hardness value than the top zone. After the secondary phases were eliminated by the solution annealing procedure, the ultimate tensile strength and yield strength were increased by nearly 17% to 38% and 15% to 22% in the top and bottom one of the multilayer wall structures, respectivelyObločno navarjanje z žico (WAAM) je obetavna tehnika za izdelavo kompleksnih geometrij superzlitin na osnovi niklja, kot je Inconel 625. V pričujoči raziskavi smo analizirali mikrostrukturo in mehanske lastnosti zlitine Inconel 625, izdelane s postopkom obločnega varjenja s plinskim volframom (GTAW) v tehnologiji WAAM, da bi raziskali učinke toplotne obdelave na zgornjo in spodnjo cono večplastne stenske strukture. Vzorci so bili dve uri toplotno obdelani pri 980°C, nato pa ohlajeni z vodo (žarjenje z raztopino). Po toplotni obdelavi mikrostruktura razkriva, da so najbolj pogoste faze, kot so laves, sekundarne faze (?’) in monokarbidi (MC), raztopljene, kar je jasno opazno z optično mikroskopijo (OM), skenirno elektronsko mikroskopijo (SEM) in energijsko disperzijsko spektroskopijo (EDS). Tudi po postopku toplotne obdelave mehanske lastnosti, kot so rezultati mikrotrdote, kažejo, da ima spodnja cona večplastne stenske strukture višjo vrednost trdote kot zgornja cona. Po odstranitvi sekundarnih faz s postopkom raztopinskega žarjenja sta se natezna trdnost in meja plastičnosti v zgornjem in spodnjem delu večplastne stenske strukture povečali za skoraj 17% do 38% oziroma 15% do 22%TEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo