298 KB21 KB200020242014Opiela, Marekštevilka:4letnik:48str. 587-591COBISSID:1075626ISSN:1580-2949URN:URN:NBN:SI:doc-9HKV3OZ0enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeforged partsmechanical propertiesmehanske lastnostimicro-alloyed steelsmikrolegirana jeklaodkovkitermomehanska obdelavathermomechanical treatmentThermomechanical treatment of Ti-Nb-V-B micro-alloyed steel forgings| Termomehanska obdelava odkovkov iz mikrolegiranega jekla Ti-Nb-V-B|The work presents the research results of the influence of thermomechanical treatment through forging on the microstructure and mechanical properties of newly elaborated micro-alloyed steel containing 0.28 % C, 1.41 % Mn, 0.028 % Ti, 0.027 % Nb and 0.019 % V. The applied thermomechanical treatment makes it possible to obtain a fine-grained microstructure of austenite during the hot working and the production of forged parts that acquire an advantageous set of mechanical properties and a guaranteed crack resistance after controlled cooling from the finishing plastic-deformation temperature and the successive tempering. The forgings produced with the method of thermomechanical treatment, consecutively subjected to tempering in the temperature range from 550 °C to 650 °C, have YS0.2 from 994 MPa to 939 MPa, UTS from 1084 MPa to 993 MPa and KV-40 from 77 J to 83 JDelo predstavlja rezultate vpliva termomehanske obdelave s kovanjem na mikrostrukturo in mehanske lastnosti novo izdelanega mikrolegiranega jekla z 0,28 % C, 1,41 % Mn, 0,028 % Ti, 0,027 % Nb in 0,019 % V. Uporabljena termomehanska obdelava omogoča doseganje drobnozrnate mikrostrukture avstenita med vročo predelavo in izdelavo odkovkov, ki dobijo dobre mehanske lastnosti in zagotovljeno odpornost proti razpokam po kontroliranem ohlajanju iz končne temperature plastične deformacije in po popuščanju. Odkovki, izdelani po metodi termomehanske obdelave in nato popuščani v temperaturnem območju od 550 °C do 650 °C, imajo YS0.2 od 994 MPa do 939 MPa, UTS od 1084 MPa do 993 MPa in KV-40 od 77 J do 83 JTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije