20.500.12556/DKUM-66812 Experimental determination of fatigue parameters of high chromium steel under different loading and temperature conditions Eksperimentalno određivanje parametara zamornog ponašanja visokokromnog lijevanog čelika pri različitim režimima opterećivanja i temperature Fatigue investigation of high chromium steel (HCS) at different loading ratios (R = 0, R = -1) and different temperatures (20 °C, 600 °C) is presented in this paper. Before fatigue testing, monotonic mechanical properties (ultimate compressive and ultimate tensile strength) are determined at different temperatures, using standardized testing procedures according to DIN 50125 standard. Moreover Charpy impact tests at different temperatures were done with specimens that comply with the standard ISO 14556. Fatigue testing is performed on a servo - hydraulic testing machine with consideration of different loading conditions as described above. On the basis of the experimental results the S - N curves are constructed from which typical fatigue parameters (the fatigue strength coefficient 0'f and the fatigue strength exponent b) are determined. After fatigue testing a comprehensive investigation of fracture surfaces is performed using the Scanning Electron Microscope (SEM). Experimental results presented in this paper will serve as a basis for further investigations related to fatigue behaviour of real working rolls in hot strip mills made of HCS. U članku je razmatrano zamorno ponašanje visokokromnog lijevanog čelika za dva omjera minimalnog i maksimalnog opterećenja (R = 0, R = –1) te na dvije temperature ispitivanja (+20 °C, +600 °C). Mehaničke karakteristike materijala na vlak i tlak su određene za obje temperature na standardnim epruvetama u skladu s DIN 50125 standardom. Isto tako Charpy ispitivanja udarne žilavosti na različitim temperaturama urađene su u skladu s ISO 14556 standardom. Zamorna ispitivanja izvedena su na servohidrauličkoj kidalici za oba omjera opterećenja. Na osnovu eksperimentalnih rezultata dobivene su S – N krivulje s tipičnim parametrima zamaranja (koeficijent σf’ i eksponent zamorne čvrstoće b). Nakon zamornih ispitivanja na karateristike na tlak obavljen je pregled prijelomne površine pomoću elektronskog mikroskopa. Eksperimentalni rezultati predstavljeni u ovom radu su osnova za daljna istraživanja zamornog ponašanja valjaka iz HCS materijala za vruće valjanje čelika. experiments high chromium steel high cycle fatigue fracture mechanics eksperimenti visoko legirano kromovo jeklo visokociklično utrujanje mehanika loma true false true Angleški jezik Hrvaški jezik Znanstveno delo 2017-07-12 08:15:07 2017-07-12 08:16:06 2022-08-01 13:11:55 2019-07-11 15:59:45 2014 0 0 str. 853-860 št. 4 Letn. 21 2014 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1330-3651 620.172.25:669.15'26 15346181 18061590 1330-3651 URN:SI:UM:DK:RUKCQFK6 Tehnicki_vjesnik_2014_Drobne,_Gubeljak,_Glodez_Experimental_determination_of_fatigue_parameters_of_high_chromium_steel_under_different_l.pdf Tehnicki_vjesnik_2014_Drobne,_Gubeljak,_Glodez_Experimental_determination_of_fatigue_parameters_of_high_chromium_steel_under_different_l.pdf 1 6E64D43D6499C2F4DCCBAD05CF27B74B bea8481163884cf8a793625c06f2d8a12027bd1982a5d6a240096cdf526315a6 65be8931-7c0e-11eb-bb7a-00155d0001ca 20.500.12556/dkum/b8c89bd7-2dc6-4a8d-9d59-7a27d0137fc1 https://dk.um.si/Dokument.php?lang=slv&id=114030 http://hrcak.srce.hr/126081 1 https://dk.um.si/Dokument.php?lang=slv&id=114029 Fakulteta za strojništvo 0 0 0