37 KB225 KB25 KB199219991998Lovrenčič-Saražin, M.Vodopivec, FrancVojvodič-Tuma, Jelenaletnik:32številka:6str. 463-470ISSN:1318-0010COBISSID:90538URN:URN:NBN:SI:doc-GD12LY3IenInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijejeklomehanske lastnostimikrostrukturatrdnostInvestigation on yield stress and strain ageing of structural steels| Raziskave napetosti tečenja in deformacijskega staranja konstrukcijskih jekel|Five steels with yield stress 265 to 1003 MPa and the microstructure of polygonal ferrite and pearlite, distorted and acikular ferrite as well as tempered martensite were investigated. By heat treated steels a better agreement was found between the empirical and the calculated yield stress. By steels with a microstructure of polygonal ferrite and pearlite mechanical properties are strongly changed by cold deformation and hardly affected by the following ageing annealing. Heat treated steels are virtually non propensive to strain ageingRaziskano je bilo 5 jekel z mejo plastičnosti med 265 in 1003 MPa ter mikrostrukturo iz poligonalnih ferita in perlita, spačenega in acicularnega ferita in popuščenega martenzita. Ujemanje med empirično in izračunano napetost tečenja je boljše pri toplotno obdelanih jeklih. Hladna deformacija močno spremeni lastnosti jekel z mikrostrukturo iz poligonalnih ferita in perlita, medtem ko se lastnosti komaj spremenijo pri žarjenju za staranje. Toplotno obdelana jekla so odporna proti deformacijskemu staranjuNadaljuje se kot: Materiali in tehnologijeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije