20.500.12556/RUL-169380 Heat treatment optimisation of 18 % Ni maraging steel produced by DED-ARC for enhancing mechanical properties This article deals with the Directed Energy Deposition using Wire and Arc (DED-ARC) for maraging steel cladding. A technology for cladding using Gas Metal Arc Welding (GMAW) has been developed that enables the perfect deposition of maraging steel. The material characterisation was carried out in different material states: in the as-built, solution annealed and aged. The research included visual examinations, optical microscopy, Scanning Electron Microscopy / Energy-dispersive X-ray spectroscopy (SEM/EDS), fractography, hardness testing, tensile testing and impact toughness testing. The as-deposited state exhibited a microstructure with very long crystal grains and microsegregations orientated the direction of the heat sink, consisting of lath martensite. Consequently, a subsequent heat treatment is absolutely necessary in order to obtain a uniform fine-grained microstructure. Two different solution annealing processes were analysed, which allowed us to select the most suitable process for the first step of heat treatment followed by aging. A response surface methodology was used to optimise the aging conditions. The results show that additively manufactured maraging steel reaches a tensile strength of 1947 MPa, a hardness of 657 HV5 and a Charpy impact toughness of 11 J at peak aging condition, which is comparable to conventionally manufactured maraging steel. maraging steel heat treatment material properties optimisation DED-ARC GMAW RSM maraging jeklo toplotna obdelava optimizacija materialnih lastnosti DED-ARC MIG metoda odziva površin true false true Angleški jezik Slovenski jezik Članek v reviji 2025-05-26 15:51:29 2025-05-26 15:51:36 2025-05-27 04:01:11 0000-00-00 00:00:00 2025 0 0 12 str. Vol. 11, art. 100312 Jun. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791.75:669.14 2666-3309 10.1016/j.jajp.2025.100312 237223939 Lindic_..._-Heat_treatment.pdf Lindic_..._-Heat_treatment.pdf 1 CDDAF998EF346CEF4ABDCCFCD70D8CDE da4b3aff89f4425bd0a7f7d6f0eaf3f9de53ea13191aaec50ce6b4808611f272 d10dfa44-3a37-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=210690 https://www.sciencedirect.com/science/article/pii/S2666330925000330 1 40588567-3a37-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=210689 Fakulteta za strojništvo 0 0 0