18 KB787 KB17 KB199219991993Balenović, M.Gojić, MirkoKosec, LadislavVehovar, Leopoldletnik:27številka:45 stranistr. 307-312ISSN:1318-0010COBISSID:17095685URN:URN:NBN:SI:doc-D4EXHVD3enInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijecevijeklakaljenjekrom-molibdenova jeklanizkolegirana jeklatrdnostThe susceptibility of hydrogen embrittlement of low alloy Cr-Mo steel tubing|In the paper the results of research in the susceptibility of as-rolled and heat treated low alloy Cr-Mo (microalloy by Nb) tubing to hydrogen embrittlement by method of cathodic polarization are shown. The results show that quenching at 870°C (both in water and oil) and tempering at high temperature (720°C) attain excellent resistance to hydrogen embrittlement whichis indicated by a small embrittlement index (11.1-23.6%) by tough amall-dimple fractures and relatively small content of absorbed hydrogen (3.2-3.4 ppm) at the cathodoc polarizationRaziskovali smo občutljivost valjanih in toplotno obdelanih cevi iz malolegiranega Cr-Mo jekle (mikrolegiranega z niobom) na vodikovo krhkost. Uporabili smo metodo katodne polarizacije. Rezultati kažejo, da s kaljenjem s temperaturo 870°C (v vodi ali olju) in z visokotemperaturnim popuščanjem (720°C) dosežemo odlično odpornost proti vodikovi krhkosti. Potrjuje jo majhen indeks krhkosti (11.1-23.2%), žilav, jamičasti izgled prelomne površine in relativno majhna vsebnost obsorbiranega vodika (3.2-3.4 ppm) pri katodni polarizacijiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of Slovenia