20.500.12556/DKUM-86992 Evaluation of the impact and fracture toughness of a nanostructured bainitic steel with low retained austenite content The impact and fracture toughness of a nanostructured, kinetically activated bainitic steel was determined using Standard methods. Prior to testing, the steel was quenched in oil and aged naturally for a period of 10 days in order to obtain a fully bainitic microstructure with a retained austenite content below 1%, resulting in a high hardness of 62HRC. The high hardness originated from the very fine microstructure of bainitic ferrite plates formed at low temperatures. It was determined that the impact toughness of the steel in the fully aged condition improved remarkably, whereas the fracture toughness was in line with expectations based on the extrapolated data available in the literature. This suggests that a very fine microstructure is most beneficial to rapid loading conditions, whereas material flaws such as coarse nitrides and non-metallic inclusions are the major limitation for obtaining a high fracture toughness. evaluation of fracture toughness impact toughness nanostructured bainite natural aging low retained austenite content kinetically activated bainite KAB ocena lomne žilavosti udarna žilavost nanostrukturni bainit naravno staranje nizka vsebnost zadržanega avstenita kinetično aktiviran bainit KAB true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/journal/materials Članek v reviji 2024-02-06 06:40:25 2024-02-16 12:33:10 2024-04-04 08:55:27 0000-00-00 00:00:00 2023 0 0 Str. 1-12 Št. 5, št. članka 2003 Letn. 16 Feb. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2023-01-24 2023-02-22 2023-02-28 539.4:669.15-194.591 144522499 10.3390/ma16052003 1996-1944 Bruncko-2023-Evaluation_of_the_Impact_and_Frac.pdf Bruncko-2023-Evaluation_of_the_Impact_and_Frac.pdf 1 00A32942FBA7F0CB7408C65A47A46EE3 641a74cad7aba80f717b01e2a41bf86bb335e0044ccd5b3c619474494372303f ee731cd7-ccbe-11ee-b5a0-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=176209 https://doi.org/10.3390/ma16052003 0 3aabdaa0-c4b2-11ee-b2aa-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=175926 Fakulteta za strojništvo 0 0 0