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Mikrostrukturna analiza orodja za ulivanje steklenic : poročilo
Doberšek, Mirko ...
V preiskavo so bili prejeti vzorci reklamiranega orodja BO 4273 iz nizko legirane sive litine, pri katerem so se v času uporabe pojavile razpoke v vratu kalupa. Mikrostrukturne preiskave zlitine EF6 ...za izdelavo orodja BO 4273 za ulivanje steklenic s svetlobnim in vrstičnim elektronskim mikroskopom, so potrdile prisotnost tangencialnih in radialnih razpok v vratu kalupa. Radialne razpoke od površine ulitka proti notranjosti so nastale v fazi strjevanja litine v peščeni formi, kar nakazujejo ugotovljene plasti železovih oksidov na stenah razpok. Tangenciale razpoke v notranjosti ulitka imajo lahko vzrok v pripravi ležišča za vložek, ali pa so, bolj verjetno, posledica dodatnih notranjih napetosti zaradi mikrostrukturnih sprememb, ki nastanejo na površini kalupa v tehnološki fazi navarjanja plasti stelita. Rezultati bodo v pomoč pri načrtovanju tehnologije izdelave teh orodij.
Type of material - treatise, study
; adult, serious
Publication and manufacture - Ljubljana : IMT - Inštitut za kovinske materiale in tehnologije, 2008
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