20.500.12556/DKUM-45711 Vpliv nezadostne in prevelike toplotne obdelave TVP na udarno žilavost na jekla za povišane temperature Influence of unsufficient and over sufficient post weld heat treatment on HAZ impact toughness of steel for elevated temperatures Namen diplomske naloge je bil določiti ustrezno temperaturo in čas toplotne obdelave TVP na jekla za povišane temperature po varjenju, da dosežemo dobro žilavost ob ustrezni trdoti. Osredotočil sem se predvsem na eksperimentalni del, pri katerem je bil cilj izvesti simulacijo varjenja na preizkušancih, jih nato toplotno obdelati pri različnih temperaturah in časih ter izmeriti žilavost na instrumentiranem Charpy kladivu. Udarno žilavost merimo z metodo Charpy, ki določa potrebno delo za prelom preizkušanca. Rezultati so pokazali, da toplotna obdelava pri 740 °C in 800 °C povzroča nezadostno in preveliko žilavosti in ni najbolj primerna. Iz tega lahko sklepamo, da imajo zelo majhne spremembe toplotne obdelave velik vpliv na mehanske lastnosti materiala. The aim of this diploma work is to determinate proper temperature and time post weld heat treatment of HAZ on creep resistant steels after welding. With this procedure we get sufficient impact tougness and hardness. I focused on my experimental work, the weld simulation of samples and post weld heat treatment by different temperatures and time intervales with measure of impact toughness by instrumented charpy pendulum. The impact toughness is measured by Charpy metode, which determinates minimal imput of forze for braking the sample. The results showed, the temperature at 740 °C and 800 °C means unsufficient and oversufficient impact toughness and it is not appropriate. That leads us to conclusion that very small changes in heat treatmend have great influence on mechanical propertis of material. jeklo za povišane temperature var TVP simulacija varjenja dilatacija toplotna obdelava udarna žilavost Charpy preizkus creep resistant steel welded joint HAZ weld simulation delitation heat treatment impact toughness Charpy metode true true false [L. Fekonja] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2014-09-02 06:34:55 2014-12-11 12:35:12 2022-05-16 03:06:13 2021-05-03 03:35:19 2014 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.178.2:669.14.018.62(043.2) 18474518 URN:SI:UM:DK:B1JRN4SF UNI_Fekonja_Luka_2014.pdf UNI_Fekonja_Luka_2014.pdf 1 2B37146166E52CBD3FF483C000CF1D7F f86cd486730f7ef080b73cec15198c65f79e82797a5e44b8724c39789d182290 45e6b921-7c0b-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=67577 Fakulteta za strojništvo 0 0 0