20.500.12556/DKUM-26928 Tensile test models for low-carbon microalloyed steels with high niobium contents Modeli za ispitivanje rastezne čvrstoće nisko-ugljičnih mikrolegiranih čelika s visokim sadržajem niobija In the present investigation, the effect of both: rolling parameters (2 reduction rates and 3 cooling rates) and chemical elements such as: C, Mn, Nb,Ti, Mo, Ni, Cr, Cu and B, has been studied in relation to strength properties in low-carbon microalloyed steels with high niobium contents (up to 0,12 wt. % Nb). For this purpose, an experimental set-up was designed based on an intelligent design of experiments (DoE), resulting in 26 casts (laboratory casts).Acombination of metallography, Electron Back-Scattered Diffraction (EBSD) and tensile tests have been performed to study how processing parameters and chemical composition affect the strength. The results, where the proof stress, tensile strength, uniform and fracture elongations are the response variables, have been analysed statistically by means of multiple linear regression technique, leading to response equations. From the results, it was found that the effectiveness of niobium increasing the strength is reduced as carbon content increases. U ovom se istraživanju proučavao utjecaj parametara valjanja (2 redukcijske brzine i 3 brzine hlađenja) i kemijskih elemenata kao što su: C, Mn, Nb, Ti, Mo, Ni, Cr, CuiB na svojstva čvrstoće niskougljičnih mikrolegiranih čelika s visokim sadržajem niobija (do 0,12 wt.%Nb). U tu je svrhu konstruiran pokusni uređaj zasnovan na inteligentnom dizajnu eksperimenata (DoE), rezultirajući s 26 odljevaka (laboratorijskih odljevaka). Kombinacijom metalografije, Electron Back-Scattered Diffraction (EBSD) i vlačnih ispitivanja proučavalo se kako obradni parametri i kemijski sastav djeluju na čvrstoću. Kada je ispitivanje rezultiralo naprezanjem, rasteznom čvrstoćom, jednoličnom deformacijom ili deformacijom zbog loma, rezultati su statistički analizirani tehnikom višestruke linearne regresije, koja je dovela do odgovarajućih jednadžbi. Ustanovilo se da se učinak niobija na povećanje čvrstoće smanjuje kako se povećava sadržaj ugljika. microalloyed steels mechanical properties niobium mikrolegirana jekla mehanske lastnosti niobij true false true Angleški jezik Hrvaški jezik Znanstveno delo 2012-06-01 08:40:03 2012-06-01 08:40:03 2022-04-15 13:35:14 2022-03-30 03:06:04 2011 0 0 str. 561-569 št. 4 Letn. 18 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1330-3651 620.172.18:669.15-194 15346181 15654934 1330-3651 URN:SI:UM:DK:9Q5RQP94 Tehnicki_vjesnik_2011_Perez-Bahillo_et_al._Tensile_test_models_for_low-carbon_microalloyed_steels_with_high_niobium_contents.pdf Tehnicki_vjesnik_2011_Perez-Bahillo_et_al._Tensile_test_models_for_low-carbon_microalloyed_steels_with_high_niobium_contents.pdf 1 A83D52723BA90C29E84419E12078DB4D 0ff7595158d5833a155ef9fc5e2640fd77fb7528a528c01feaf5e52844521e32 67085d35-7c0e-11eb-bb7a-00155d0001ca 20.500.12556/dkum/fe6221f2-5140-4c5c-b542-7800704bd66d https://dk.um.si/Dokument.php?lang=slv&id=114068 http://hrcak.srce.hr/75404 1 https://dk.um.si/Dokument.php?lang=slv&id=36129 Fakulteta za strojništvo 0 0 0