1896 KB19 KB200020242014Grajcar, AdamRadwański, Krzysztofletnik:48številka:5str. 679-683COBISSID:1086122ISSN:1580-2949URN:URN:NBN:SI:doc-ITYUMYLGenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeausteniteavstenitEBSD-tehnikaelectron backscatter diffraction techniquemartensitemartenzitmultiphase steeltermomehanska obdelavathermomechanical treatmentTRIP effectučinek TRIPvečfazno jekloMicrostructural comparison of the thermomechanically treated and cold deformed Nb-microalloyed trip steel| Primerjava mikrostruktur termomehansko obdelanega in hladno deformiranega, z Nb-mikrolegiranega trip-jekla|The work deals with a microstructural comparison of the thermomechanically processed and subsequently cold deformed Nb-microalloyed Si-Al-type multiphase steel, showing a TRIP effect. The newly developed steel was subjected to the thermomechanical rolling and controlled cooling under the conditions allowing us to obtain a fine-grained ferritic-bainitic microstructure with a large fraction of the retained austenite. Subsequently, the thermomechanically rolled sheet samples were subjected to a 10 % elongation in uniaxial tension. The comparison of the multiphase microstructures and, especially, the identification of the strain-induced martensite were carried out using light microscopy, electron transmission microscopy and electron scanning microscopy equipped with EBSD (electron backscatter diffraction). Morphological details influencing the mechanical stability of the retained austenite were indicatedDelo obravnava primerjavo mikrostruktur termomehansko obdelanega in nato hladno deformiranega, z Nb-mikrolegiranega večfaznega jekla Al-Si, ki izkazuje vedenje TRIP. Novo razvito jeklo je bilo termomehansko valjano in kontrolirano ohlajeno v razmerah, ki omogočajo doseganje drobnozrnate feritno-bainitne mikrostrukture z velikim deležem zaostalega avstenita. Termomehansko izvaljani vzorci pločevine so bili nato izpostavljeni 10-odstotnemu raztezku pri enoosni natezni obremenitvi. Primerjava multifaznih mikrostruktur in posebno določanje napetostno induciranega martenzita je bila izvršena s svetlobno mikroskopijo, elektronsko presevno mikroskopijo in elektronsko vrstično mikroskopijo, opremljeno z EBSD (Electron Backscatter Diffraction). Prikazane so morfološke podrobnosti, ki vplivajo na mehansko stabilnost zaostalega avstenitaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije