Napoved mehanskih lastnosti jekel pri kaljenju na osnovi akustične emisije : doktorsko delo

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Napoved mehanskih lastnosti jekel pri kaljenju na osnovi akustične emisije : doktorsko delo

Mojškerc, Bor

Direktno potopno kaljenje se uporablja za izboljšanje mehanskih lastnosti različnih jeklenih strojnih delov. Postopek poteka na način, da se obdelovance segreje na temperaturo avstenitizacije in nato ... ohladi z gašenjem v gasilnem sredstvu. V okviru disertacije je razvita neporušna metoda nadzora kaljenja jekel na osnovi akustične emisije (AE). V skladu z načrtom eksperimentov so izvedeni številni preizkusi pri različnih pogojih kaljenja in različnih vzorcih. Uporabljena so gasilna sredstva, kot so voda, polimerno-vodna raztopina z različno koncentracijo, deionizirana voda ali slanica. Pri gašenju oddana AE je zajeta z različnimi piezoelektričnimi senzorji. Analizirane so številne karakteristike signalov AE. Poleg zajema AE so izvedene meritve ohlajevalnih krivulj s termoelementi, metalografska analiza, meritve trdote, natezni preizkus, Charpyjev preizkus udarne žilavosti in meritve zaostalih napetosti po metodi rentgenske difrakcije. Vzpostavljena je korelacija karakteristik AE in mehanskih lastnosti pri različnih pogojih kaljenja. Prikazan je vpliv spremembe razmerja med površino in volumnom vzorcev na signale AE. Prikazani sta metodi zaznavanja nečistoč v gasilni kopeli in nastanka razpok na vzorcih. Eksperimentalni rezultati potrjujejo uporabnost metode za nadzor direktnega potopnega kaljenja jekel v industriji.

Type of material - dissertation ; adult, serious

Publication and manufacture - Ljubljana : [B. Mojškerc], 2019

Language - slovenian

COBISS.SI-ID - 16932379

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Digitalna knjižnica Slovenije - dLib.si

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Author
Mojškerc, Bor

Other authors
Grum, Janez, 1946- | Kek, Tomaž, 1974-

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Mojškerc, Bor	37988
Grum, Janez, 1946-	03551
Kek, Tomaž, 1974-	23778

Source: Personal bibliographies and: SICRIS

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