1503 KB25 KB200020242014Arh, BoštjanJenko, MonikaRajić, ŽarkoŠarler, BožidarTehovnik, FrancTorkar, Matjažštevilka:4letnik:48str. 537-543COBISSID:1067690ISSN:1580-2949URN:URN:NBN:SI:doc-G45ZOE9IenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijegas porosityizcejanjelunkerplinska poroznostsegregationsshrinkage cavitysolidificationspring steelstrjevanjevzmetno jekloMicrostructure characteristics of the model spring steel 51CrV4| Značilnosti mikrostrukture modelnega vzmetnega jekla 51CrV4|There are many data on solidification processes in the literature, but there are no relevant comparisons performed for the formation of an as-cast microstructure, the formation of gas porosity, and the influence of different cooling rates on the solidification of the molten, non-killed spring steel 51CrV4. During a relatively rapid solidification the majority of the dissolved gases remain entrapped and due to a solid shell being formed they cannot escape from the steel. The result is the formation of gas porosity and a shrinkage cavity. Here we present the results of an investigation of the appearance and distribution of gas bubbles and a shrinkage cavity as well as the characterization of an as-cast microstructure in ingots of model spring steel, cast and cooled in different waysV literaturi je mnogo podatkov o procesu strjevanja, vendar pa ni podatkov o primerjavi med nastankom strjevalne strukture in nastankom poroznosti med strjevanjem nepomirjenega vzmetnega jekla 51CrV4. Pri relativno hitrem strjevanju večina raztopljenih plinov ostane ujetih v jeklu in zaradi nastanka skorje ne morejo pobegniti iz njega. Rezultat tega je nastanek plinske poroznosti in lunkerja. Predstavljeni so rezultati preiskav ter pojava in razporeditve plinskih mehurčkov in lunkerja, kot tudi karakterizacija mikrostrukture v ingotih vzmetnega jekla, ulitih in ohlajenih na različne načineTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije