20.500.12556/DKUM-52802 The behaviour of coarse-grain HAZ steel with small defects during cycling loading Vedenje jekla grobozrnatega TVP z napakami pri ciklični obremenitvi The effects of small, artificial surface defects on the fatigue strength of coarse grain HAZ material found at the weld toe were studied. The size of defects did not exceed the grain size, which is the most relevant microstructural unit of polycrystalline metals. The artificial defects were made by indenting the material with Vicker`s pyramid and by drilling holes. The samples of coarse-grain HAZ material were prepared using a welding thermal-cycle simulator or furnace. The mexperimentally determined bending fatigue strength versus the properly evaluated defects siye was compared with the propagation of long cracks. Residual stresses appear when making small artificial defects. The crack initiation from the defects was analysed and theinfluence of residual stresses is discussed. Raziskan je bil vpliv majhnih umetnih napak na dinamično trdnost grobozrnatega dela TVP ob robu zvarov. Napake niso bile večje od kristalnih zrn, ki so najbolj pomembna enota polikristalnih materialov. Umetne napake smo ustvarili z odtiskovanjem Vickesove piramide in vrtanjem. Preizkušance z grobozrnatim jeklom TVP smo pripravili v simulatorju termičnega cikla in v peči. Eksperimentalno določeno upogibno dinamično trdnost v odvisnosti od velikosti napake smo primerjali s propagacijo dolgih razpok. S pripravo umetnih napak nastanejo zaostale napetosti. V razpravi je govor o začetku razpoke iz napak in o vplivu zaostalih napetosti. varjenje zvarni spoji TVP rob zvara groba zrna dinamična trdnost umetne napake stabilna razpoka zaostale napetosti welding welded joints HAZ weld toe coarse grain fatigue strength artificial defect residual stresses non-propagating crack true false true Angleški jezik Slovenski jezik Znanstveno delo 2015-07-10 18:23:51 2015-07-10 18:23:51 2022-06-01 03:07:31 2021-05-10 03:28:30 2007 0 0 str. 125-130 št. 3 Letn. 41 2007 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1580-2949 621.791.05:620.178.152.3 106193664 11446550 1580-2949 URN:SI:UM:DK:CH7FD4BA Materiali_in_Tehnologije_2007_Gliha,_Vuherer_The_behaviour_of_coarse-grain_haz_steel_with_small_defects_during_cyclic_loading.pdf Materiali_in_Tehnologije_2007_Gliha,_Vuherer_The_behaviour_of_coarse-grain_haz_steel_with_small_defects_during_cyclic_loading.pdf 1 5923A470163716156E132A528D30AB4C 2382f0449f027c803046fb456201cf0c98a6f9a34ded09238c2bdb1903b62b92 03650eb3-7c0e-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=110097 http://mit.imt.si/Revija/izvodi/mit073/gliha.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=110096 Fakulteta za strojništvo 0 0 0