26 KB851 KB24 KB199219991993Ažman, A.Lagoja, A.Lovrečič Saražin, MarkoUle, BorisVojvodič-Tuma, Jelenaletnik:27številka:45 stranistr. 283-288ISSN:1318-0010COBISSID:17093637URN:URN:NBN:SI:doc-7KWCV8KAenInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijedrobnozrnata malolegirna jeklalomna žilavostmehanika lomatemperatura ničelne duktilnostitest s padajočim bremenomRelatioship between fracture toughness and mechanical properties of some structural steels at low temperatures|The effect of strain-aging on the impact toughness characteristic of Charpy specimens (CVN) and on quasi-static fracture toughness values K?$_IC$? of some structural steels was investigated in the temperature range of nil-ductility temperatures. Strain-aging provokes shifts of Charpy curves to higher temperatures, but it decreases the nil-ductility temperatures regarding to as purchased steels. The correlation between K?$_IC$? and conventional mechanical properties valid for low temperatures confirms that K?$_IC$? and probably also K?$_arrest$? of a strain-aged steels are higher than that of as purchased steels with the same Charpy energyRaziskali smo vpliv deformacijskega staranja nekaterih konstrukcijskih jekel na njihovo udarno Charpyjevo žilavost (CVN) ter kvazi-statično lomno žilavost K?$_IC$? v temperaturnem območju ničelne duktilnosti. Deformacijsko staranje pomakne Charpyeve krivulje k višjim temperaturam, vendar pa zniža temperature ničelne duktilnosti glede na jekla v dobavnem stanju. Korelacija med K?$_IC$? in konvencionalnimi mehanskimi lastnostmi, veljavna pri nizkih temperaturah, kaže, da je K?$_IC$? in verjetno tudi K?$_arrest$? vrednost staranih jekel višja kot pri jeklih v dobavnem stanju z enako Charpyevo energijoTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of Slovenia