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Preiskava poškodovane gredi in ležaja tovornega vagona št. 35 79 785 0062 - 1 : poročilo št. 25683Gerdun, Viktor, 1971-Pri havariji je bil poškodovan ležaj, gred, ohišje ležaja tovornega vagona in odsek proge v dolžini približno 8 km. Do poškodbe gredi je prišlo zaradi poškodbe ležaja in posledično pregretja. Najprej ... se je poškodoval zunanji ležaj, potem še notranji. Nastalo je toliko toplote, da je temperatura gredi, notranjega obroča ležaja, valjčkov in kletke presegla 900 in celo 1000°C. To dokazuje mikrostruktura gredi, ki je iz widmannstätskega ferita in perlita, ki nastane pri ohlajanju pregretega jekla na zraku. Jeklu, ki je segreto v avstenitno področje do visokih temperatur ali pa daljši čas okrog temperature 1000°C močno zrastejo kristalna zrna. Pri ohlajanju pri omenjenih pogojih se začne transformacija avstenita z izločanjem ferita poliedrične oblike po kristalnih mejah in v obliki ploščic znotraj kristalnih zrn. Na koncu preostali avstenit transformira v perlit. Zaradi takšnih temperatur se je začela nataljevati vodilna kletka, ki je dvofazne medi za obdelavo na avormatih. Ko je tekoča faza prišla v stik z vročo gredjo z avstenitno mikrostrukturo, je povzročila v gredi nastanek krhkih razpok in penetracijo tekoče kovine v njih.Type of material - treatise, studyPublication and manufacture - Ljubljana : Institut za metalne konstrukcije, 2003Language - slovenianCOBISS.SI-ID - 26253573
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Gerdun, Viktor, 1971- | 21983 |
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